antenna seatel series 94 troubleshooting guide

March 2001

Marine Stabilized Antenna Systems

Document No

119292-0

Series 94

Troubleshooting Guide

Introduction Series 94 Troubleshooting Guide

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I Introduction

This troubleshooting guide is organized into 5 sections which are intended to help you operate, test andtroubleshoot Series 94 Stabilized Antenna Systems. Should you find any errors, or have any suggestions, pleasecall or fax your input to Sea Tel.

Refer to the appropriate Quick Start Operation guide for your system for routine operation.

When you need to isolate a problem, start with the Troubleshooting Procedures section. Many problems areactually found to be an incorrect operator setting or parameter, rather than a component failure. Follow theprocedures through Initial Power-up Operation, to functional Testing and finally to Problem Scenarios orTroubleshooting Modules.

If you have identified a specific failure, you may prefer to go directly to the appropriate Troubleshooting Module(s)to begin (refer to the Table of Contents).

In using this troubleshooting guide you may be pointed from a procedure, test or problem to another section or toa troubleshooting module. You may also be directed from one troubleshooting module to another. The “action totake/step to go to” column contains several key words which are used to direct you. These are:

(blank) go to the next step down

re-check re-check this step before going onre-test re-test a specific step then proceed as directed by that step

return return to the previous module step or procedure that pointed you to this section of stepsREQUIRED EQUIPMENTThe tools and equipment necessary to perform these tests are:

a. Service Manual with Troubleshooting Guideb. Multimeter

c. Basic Technicians toolsd. Spare Parts Kite. Bubble level (small)

f. 9-Pin Loop-Back connectorg. 15-Pin In-Line test-point connector

CAUTIONSEquipment damage:a. Do NOT “hot plug” connections to the TAC-92C while power is ON. This will cause damage to

the Aux Serial Ports (J11 & J13), Main PCB (any Antenna control connection) and PCU (anyAntenna control connection).

b. Aux Serial Ports (J11 & J13) have +24VDC output, when connecting a computer to these portsuse Cable PN 116670.

Electrical shock/personnel safety:a. AC voltage exists in the TAC-92C, exercise caution to prevent electrical shock.b. AC voltage from a Synchro Gyrocompass input to the TAC-92C is NOT turned OFF when the

TAC-92C power is OFF. Exercise caution to prevent electrical shock.

Sea Tel, Inc.1035 Shary CourtConcord, CA 94518 USATel: 925-798-7979Fax: 925-798-7986Toll Free: 1-888-798-7979Email: [email protected]://www.seatel.com

Sea Tel EuropeUnit 1 Orion Industrial CentreWide Lane SwaythlingSouthhampton S018 2HJTel: +44 (0)23 80 671155Fax: +44 (0)23 80 671166e-mail: [email protected]

Table of Contents

I Introduction 1-1II Quick Start Operation 2-1III Troubleshooting Procedures 3-1

1 Basic system power-up and initial operation 3-11.1 Turn on the satellite receiver(s) 3-11.2 Other Distribution Equipment 3-11.3 Turn on the TV(s) 3-11.4 WeSat Equipment 3-11.5 Turn TAC-92C Power ON 3-1

1.5.1 Press RESET 3-11.5.2 Front Panel key checks 3-21.5.3 Press the SHIP 3-21.5.4 Press SAT 3-21.5.5 Verify that the TAC-92C parameters 3-2

1.6 When the antenna has completed initializing 3-31.6.1 If the antenna acquires the desired satellite 3-31.6.2 If the antenna is not on the DESIRED satellite 3-31.6.3 If the antenna does not acquire any satellite 3-4

1.7 Check for blockage 3-4

2 Functional Testing 3-42.1 TAC-92C Front Panel Test 3-42.2 Azimuth Drive Test 3-42.3 Elevation Drive Test 3-42.4 Targeting Test 3-5

2.4.1 Test Targeting 3-52.4.2 Evaluate AZ & EL TRIM Values 3-6

2.5 AGC Signal Level Tests 3-72.6 Tracking Test 3-82.7 Heading Testing 3-8

2.7.1 Internal Fluxgate 3-82.7.2 External Fluxgate 3-82.7.3 Gyrocompass - NMEA Heading Output 3-92.7.4 Gyrocompass - Step-By-Step (SBS) Heading Output 3-92.7.5 Gyrocompass - Synchro Heading Output 3-10

2.8 Underway Testing 3-102.9 Initialization Test 3-112.10 Rate Sensor / Stabilization Test 3-112.11 Fluxgate Compensation Test 3-11

3 Symptom / Problem Scenarios 3-123.1 Antenna Drifts Off Satellite 3-123.2 Channels Freeze Frame 3-123.3 Constant Unwrap LED 3-133.4 Heading Input Fault Isolation 3-13

3.4.1 Internal Fluxgate Fault Isolation 3-133.4.2 Ships Gyrocompass Fault Isolation - General 3-133.4.3 SBS Gyrocompass Output 3-143.4.4 Synchro Gyrocompass Output (36:1, 90:1 or 360:1) 3-143.4.5 Synchro Gyrocompass Output (1:1 ONLY) 3-14

Introduction Series 94 Troubleshooting Guide

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Table of Contents

3.5 IF Distribution Problem 3-153.6 Remote Not Responding 3-153.7 TAC-92C Display Blank 3-15

IV Troubleshooting ModulesACC1.0 Antenna Control Cable 4-1AZD1.0 Azimuth Drive problems 4-4AZR1.0 Azimuth Rate Sensor 4-9CLD1.0 Cross Level Drive problems 4-12CLR1.0 Cross Level Rate Sensor 4-17COMP1.0 Remote Compensation failure 4-21ELD1.0 Elevation Drive problems 4-22ELR1.0 Elevation Rate Sensor 4-27ENC1.0 Encoder failure 4-31ERR1.0 Error Codes 4-33ERR2.0 ERROR CODE 0001 – Gyro Read Error 4-34ERR3.0 ERROR CODE 0002 – Wrong Synchro Converter Type 4-41ERR4.0 ERROR CODE 0004 –Communications error 4-44ERR5.0 ERROR CODE 0008 – Pedestal function error 4-47ERR6.0 ERROR CODE 0016 – Conscan error 4-48ERR7.0 ERROR CODE 0032 – Reserved for future use 4-55ERR8.0 ERROR CODE 0064 – Reserved for future use 4-56ERR9.0 ERROR CODE 0128 – Satellite Out Of Range 4-57FLUX1.0 Fluxgate Failure 4-58HOME1.0 Home Sensor / Home Flag 4-59INIT1.0 Antenna Initialization 4-61LEV1.0 Level Cage Motor (Size 17 Stepper Motor) 4-64MINST1.0 Mechanical Installation 4-69ROM1.0 Range of Motion 4-71SIG1.0 RF/IF Signal Distribution 4-72SPOOL1.0 Spooler Cable 4-74TAC1.0 TAC-92C Power Supply 4-78TILT1.0 Tilt Sensor 4-82UNWRAP1.0 Unwrap LED is lit frequently or constantly 4-85VIS1.0 Visual Inspection 4-86

V DrawingsModel 2094 Stabilized Pedestal 5-1Model 2494 Stabilized Pedestal 5-1Model 3294 Stabilized Pedestal 5-1Model 4094 Stabilized Pedestal 5-2Model 4894 Stabilized Pedestal 5-2Model 6094 Stabilized Pedestal 5-3Radomes for DBS Antenna Pedestals 5-3Model TAC-92C Tracking Antenna Controller 5-3

Perform the following when the ship HAS NOT significantly changed geographic location or satellite selection, and the system has been turned OFF.

You enter information on the TAC 92 keyboard: The TAC 92 will display:1. Turn Power “ON”

Power switch is located in upper rightcorner of TAC-92 Rear panel.

Turn on Television and Satellite receiver2. If you have the TAC-92 interfaced to the ships’ GYRO,

Press “SHIP” four times. (If not, Go To Step 4)3. Key in the current ships Heading to the nearest

degree, then press “ENTER”. Press “RESET”.4. After Initialization

When Initialization is complete the “SEARCHING” light (green) will flash and the “UNWRAP” light (red)may be ON. In approximately 30 seconds the “SEARCHING” and “UNWRAP” lights will extinguish and the“TRACKING” light (green) will begin to flash. Within 15-30 seconds the “TRACKING” light will be ON solid-OR- the “SEARCHING” light will be ON solid. When the satellite has been acquired the “TRACKING” light will be ON solid. You may then select desired program channel. See DBS Receiver Manual for details.

Perform the following when the ship HAS significantly changed geographic location or satellite selection, and the system has been turned OFF.

You enter information on the TAC 92 keyboard: The TAC 92 will display:1. Turn Power “ON”

Power switch is located in upper rightcorner of TAC-92 Rear panel.

Turn on Television and Satellite receiver2. During initialization, press “SHIP” twice3. Key in the correct Latitude to the nearest degree.

Use the “N/S/E/W” key to select either Northor South hemisphere, then press “ENTER”.

4. Press the “SHIP” key once more5. Key in the correct Longitude to the nearest degree.

Use the “N/S/E/W” key to select East or WestLongitude, then press “ENTER”.

6. If you have the TAC-92 interfaced to the ships GYRO,press “SHIP” once more. (If not, Go To Step 8)

7. Key in the current ships Heading to the nearest degree,then press “ENTER”. Go to Step 11

8. Press the “MODE” key 5 times. Key in 7979, thenpress “ENTER”. Press “MODE” once moreor until the display reads “AZ TRIM xxxx”.

CONTINUED ON BACK...

Display should read “REMOTE INITIALIZING”

System will automatically go through an initializationsequence which takes approximately 2 minutes.

Display should read “HDG xxx.x”

Display will change to read “REMOTE ...VER.X.XX”

Display should read “REMOTE INITIALIZING”

System will automatically go through an initializationsequence which takes approximately 2 minutes.Display should read “LAT xxx”

Display will change to read “LON xxx”

Display should read “HDG xxx.x”

Display should read “AZ TRIM xxxx”

Quick StartOperation for Series 94 DBS Systems

DOC.#117192

9. From the MAGNETIC VARIATION TABLE below, choosethe city nearest your location and key in its AZ TRIMvalue using all 4 digits; for POSITIVE values press

“ENTER”, for NEGATIVE values, press “N/S/E/W”and then press“ENTER”.

10. Press “MODE” until “SAVE NEW PARAMETERS”is displayed. Press the UP arrow once, release,then press “ENTER”.

11. Press the “SAT” key twice.12. Key in the appropriate SAT Longitude from the

SATELLITE POSITION TABLE below.Use the “N/S/E/W” key to select East or WestLongitude, then press “ENTER”.

13. Press ”RESET”. After initialization...

When Initialization is complete the “SEARCHING” light (green) will flash and the “UNWRAP” light (red)may be ON. In approximately 30 seconds the “SEARCHING” and “UNWRAP” lights will extinguish and the“TRACKING” light (green) will begin to flash. Within 15-30 seconds the “TRACKING” light will be ON solid-OR- the “SEARCHING” light will be ON solid. When the satellite has been acquired the “TRACKING” light will be ON solid. You may then select desired program channel. See DBS Receiver Manual for details.

SATELLITE POSITION TABLE

SATELLITE SERVICE SATELLITE LONGITUDE (enter)DSS (Direct TV® & USSB®) 101WDish Network® 119W, 65W, 148WGLA™ (Galaxy Caribbean) 95WWeSat™ - GOES 8 75WWeSat™ - GOES 10 135W

MAGNETIC VARIATION TABLEChoose the city nearest your location and key in its AZ TRIM value. See Steps 8 and 9 above.

POSITIVE variations for West Coast U.S. and NEGATIVE for East Coast U.S.

LATITUDE & LONGITUDE LOCATION AZ TRIM Value (enter)48N 123W Seattle, WA 019038N 122W San Francisco, CA 016033N 117W San Diego, CA 013030N 90W New Orleans, LA 002028N 82W Tampa, FL -0030*26N 80W Miami, FL -0040*37N 76W Norfolk, VA -0100*39N 75W Atlantic City, NJ -0130*44N 70W Portland, ME -0180*

*Negative AZ TRIM is entered by pressing the “N/S/E/W” key before pressing “ENTER”.

Display should read “SAVE NEW PARAMETERS”

Display should read “SAT xxx”.

Display will change to read “REMOTE...VER.x.xx”

Look to the Leader. Look to SeaTel.

Sea Tel, Inc.1035 Shary CourtConcord, CA 94518

TEL: 925-798-7979E-Mail: [email protected]

www.seatel.com

Series 94 Troubleshooting Guide Troubleshooting Procedures

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III Troubleshooting Procedures

Each test in this troubleshooting section steps through specific operations of the system. If the system does notoperate as explained, then follow the Troubleshooting Guide module listed after each step. This section alsoincludes common problems experienced in the field and solutions for each. The Troubleshooting Guide modulesare arranged in alphabetical order (i.e., AZD, ENC, UNWRAP, etc.). Each module refers to drawings and/orschematics which should be used during troubleshooting. The drawings and schematics for all Series 94 modelsystems can be found in SECTION 5 following the troubleshooting modules. The Drawing list is organized byModel and includes a list of radome and TAC-92C drawings. The drawings following the listing are in drawingnumber order.

1 Basic system power-up and initial operation

This set-up procedure should be used for initial operation of the system. This will ensure that the antenna systemis set up correctly before trying to isolate a possible Electrical and/or Mechanical fault. The most common failuresare due to incorrect operator settings, incorrect parameter settings or blockage.

1.1 Turn on the satellite receiver(s)

Using the remote, make the menu selections necessary to view the signal meter display (Most Europeanreceivers do not have this option). This display will help in determining if the antenna is tracking thecorrect satellite. Also, the signal meter shows a transponder number. The odd numbered transpondersindicate “left hand” polarized signals and the even numbered transponders indicate “right hand” polarizedsignals. This information will be useful if troubleshooting an RF distribution problem.

1.2 Other Distribution Equipment

Assure that modulators, standards converters, amplifiers and any other equipment in the systemconfiguration are also energized.

1.3 Turn on the TV(s)

Assure that the television is set for the correct channel (or input) to display the satellite programming.

1.4 WeSat Equipment

If applicable, turn ON WeSat receiver and open the Weather software on the computer and select“receive Geostationary”. A helpful tool is to connect a speaker to the audio jack on the COM port that theweather information comes into. Static can be heard until the antenna crosses or finds the weathersatellite and a high “ping” or “beep” can be heard. Also, be sure to select EXT input in step 1.5.4 below.

1.5 Turn TAC-92C Power ON

The following steps may be performed during or after Initialization. Initialization will take 2 minutes.When initialization has completed the display will read the remote (PCU) Model and software versioninformation until a menu button is pressed.

1.5.1 Press RESET and record the TAC-92C software version number displayed. Thedisplay should then change to read “REMOTE INITIALIZING”.

ü If the display is blank, refer to TAC-92C, Display Blank (below)

ü If the display reads “REMOTE NOT RESPONDING”, refer to ERR4.0

ü If the ERROR LED is ON, press mode until the error code display is selected. Refer toERR1.0 to troubleshoot the error(s).

ü If the UNWRAP LED is ON for more than 2 minutes, refer to UNWRAP1.0

Troubleshooting Procedures Series 94 Troubleshooting Guide

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1.5.2 Front Panel key checks

Sequentially press SHIP, SAT, ANTENNA and MODE to verify that each displays the appropriatemenu items. If the display does not change when the keys are pressed, refer to section 3 (below)– TAC-92C, Display does not change.

1.5.3 Press the SHIP key and verify that Latitude, Longitude and Heading are correct. Ifthey are correct go to the next step. If Latitude, Longitude or Heading are incorrect

ü Press SHIP key again to select Latitude entry mode to update the present ship latitude.Enter the correct numeric value using the Numeric Keypad; use the N/S/E/W key toselect the correct hemisphere and then press ENTER.

ü Press SHIP key again to select Longitude entry mode to update the present shiplongitude. Enter the correct numeric value using the Numeric Keypad; use the N/S/E/Wkey to select the correct hemisphere and then press ENTER.

ü Press SHIP key again to select Heading mode. When the heading input is coming from aShips Gyrocompass, the initial heading MUST be entered for most gyro types (seeHeading Display Test section below). Enter the correct numeric heading value using theNumeric Keypad and then press ENTER. The display may “flash” back to some othernumber after pressing “ENTER”. This is because the antenna is initializing and cannotaccept the input until after initialization. The entry made is stored by the TAC-92C andwill update the PCU and should not need to be re-entered after initialization completes.

1.5.4 Press SAT and verify the Satellite Longitude and Receiver Selection & Tuning arecorrect

ü Refer to the Quick Start operation card(s) for a list of commonly used satellite longitudes.Press SAT again to select Satellite entry mode. Enter the correct numeric value usingthe Numeric Keypad; use the N/S/E/W key to select the correct hemisphere and thenpress ENTER.

ü Press SAT until the only the lower line is displayed. This display will show the AGC Inputsource & Tuning frequency (i.e. INA 01100) in the lower left and the present AGC valuein the lower right. Use the N/S/E/W key to toggle through the input selections, use thenumeric keypad to enter the desired frequency and press ENTER. When WeSatoperation is being used, select EXT input (no tuning frequency). For TVRO operation,use the INA xxxxx selection and enter the Ku-band downlink frequency, or theappropriate Intermediate Frequency (IF), of the desired satellite transponder. This canbe obtained from Satellite listings in almanacs, magazines or on the Internet.

1.5.5 Verify that the TAC-92C parameters are set correctly

A list of the factory default parameters can be found in the appropriate Installation & Operationmanual for your model antenna. To access these parameters press the MODE key 5 times, thedisplay will read AZ xxxx EIRP xxxx. At this display, key in the number 7979 and press ENTER.Press MODE to step down through the parameter displays listed below. To change a setting, keyin the correct number and press ENTER. After verifying all parameters, continue pressing MODEuntil the display reads “SAVE NEW PARAMETERS”. Press the UP ARROW once, then pressENTER to save any changes made in the previous steps. Incorrect parameter settings are afrequent cause of not being able to target the desired satellite or not being able to trackthe satellite properly

ü EL TRIM – Trims the Elevation display to optimize Targeting. Normally set to 0000 for allmodels.

ü AZ TRIM – Trims the Azimuth display to optimize Targeting. When using the internalfluxgate for heading input, this parameter is set to the value of magnetic variation of thegeographic location of the boat. When using an external fluxgate for heading input, thisparameter is set to the value of magnetic variation of the geographic location of the boat


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+/- any mechanical error in the radome mounting. When the heading input source is froma Gyrocompass (True heading) this parameter is mechanical mounting error only.

ü AGC THRES – Set to 0128

ü EL STEP SIZE – When operating in step track mode, set to 0002. When operating inConscan tracking mode, set to 0003.

ü AZ STEP SIZE - When operating in step track mode, set to 0002. When operating inConscan tracking mode, set to 0003.

ü STEP DELAY – Set to 0002

ü SEARCH INC – Set from 0018 to 0020

ü SEARCH LIMIT – Set to 0200

ü SEARCH DELAY – Set to 0015

ü STEP INTEGRAL – When operating in step track mode, set to 0030, 0040 or 0060.When operating in Conscan tracking mode, this parameter MUST be set to 0000.

ü SYSTEM TYPE – Most commonly set to 72 or 76

ü GYRO TYPE – Set to 0000 when the antennas own internal fluxgate is being used forheading reference. Set to 0000 when an external fluxgate compass is being used forheading reference (002 may be used on TAC-92C ver 2.77 or later). On 3294, 4094 and4894 systems the degree of accuracy needed is best met with the use of a ships gyroinput or an external fluxgate as its heading reference input. When using a Gyrocompass,the gyro type is determined by the type of Gyrocompass output AND the type of synchroconverter (daughter board) installed on the TAC-92C Main PCB — should be setaccording to the TAC-92C Heading Display Test information below. Also, when using asynchro or step-by-step input source, the Heading of the boat must be entered into theHDG display every time the antenna system power is cycled ON (including powerfailures or switching ship/shore power).

ü **Note** The heading output from a GPS is not an acceptable heading input to the TAC-92C. The “heading” output from these devices are actually Course Over Ground, whichdoes not guarantee an accurate heading reference.

ü POL TYPE – Set to 0001

ü POL 1, 2, 3, 4, 5 - N/A for US DSS feeds. European linear polarization feeds should beset to default values, especially for auto-polarization operation.

ü AZLIM1 - Used to set the relative position of the CCW side of a blockage zone, normallyset to 0000 when not being used.

ü AZLIM2 - Used to set the relative position of the CW side of a blockage zone, normallyset to 0000 when not being used.

1.6 When the antenna has completed initializing, the Tracking or Searching LEDshould be lit.

1.6.1 If the antenna acquires the desired satellite:

Check all the receivers for adequate signal level on both the odd & the even transponders (maybe done using signal meter or by observing programming channels) then go on to functionaltesting in step 2.0 below.

1.6.2 If the antenna is tracking on a satellite, but it is not on the DESIRED satellite:

This indicates that the system is able to acquire and track satellites. The most common causesare that the desired satellite is blocked or targeting is not accurate. Check for blockage andassure that the AZ TRIM value is set correctly.


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Assure that the TV is set to the correct input selection (CH # or LINE) for the satellite receiveroutput. Set the receiver to a promotional channel so programming can be seen when theantenna is on the desired satellite. Also check the IF distribution to the receivers.

Some boats have multiple feeds & receivers (i.e. DSS & GLA) onboard. Assure that the correctfeed & receivers are installed for the satellite service coverage in your location.

Re-target or manually search for satellite. Once the desired satellite is found, evaluate AZ & ELTRIM values to optimize the targeting of the antenna. If AZ TRIM needs to be greater than +/- 10degrees check Heading Testing in section 2 below. Refer to FLUX1.0 & MECH1.0 fortroubleshooting the large value of AZ TRIM.

1.6.3 If the antenna does not acquire any satellite:

Assure that the TAC-92C receiver selection (INA, INB or IF) and tuning frequency is correct.

There should be some level of AGC even when pointed away from any satellites. If the AGClevel does NOT change when you unplug the coax from the rear panel of the TAC-92C, thisindicates that there is a loss of IF input (failed coax, matrix switch or LNB OR a loss of DC voltageto the LNB) or a failure of the AGC tuner circuits. Refer to AGC Signal Level Tests, IFDistribution Problems and TAC-92C AGC problems below.

If the AGC does change significantly (400+ AGC counts) when you unplug the coax, check forblockage and refer to Functional Testing below to isolate the failure further.

1.7 Check for blockage:

Assure that there are no obstructions between the antenna and the satellite. The satellite signal is line ofsight and any object that is directly in the signal path will attenuate the signal. The satellites are inGeostationary orbit over the equator, therefore they should be south of you if you’re in the northernhemisphere or north of you if you’re in the southern hemisphere. You can visually sight past the radometoward the approximate direction of the satellites to see if there may be some object in the satellite signalpath. The satellite signal will penetrate through most thin plastic and fiberglass with a small amount ofattenuation but will not penetrate through metals, buildings or other structures that are in between theantenna and the desired satellite. If there IS blockage between the antenna and the desired satellite, theantenna may not be able to acquire that satellite until the boat is moved or turned to a different headingwhere no obstructions are in the signal path to the antenna. It may acquire, and track, an adjacentsatellite which is not blocked.

If there does not appear to be any blockage you may need to open the radome to assure that the antennais pointing in the right general direction of where the satellites are (north or south of you). If the antennadoes not target to the correct general pointing, it cannot possibly find a signal to track in its search area.Refer to Functional Testing below to isolate further.

2 Functional Testing

2.1 TAC-92C Front Panel Test

Test the operation of the front panel buttons to assure that the appropriate menu items appear for eachkey that was pressed. If the display does not change, refer to TAC-92C, Display does not change.

2.2 Azimuth Drive Test

Select Azimuth Entry mode and note the present AZ and AGC values. Press the UP or DOWN arrow keyrepeatedly to step the antenna position. Verify that the antenna position and AGC change as you moveon to, or off of, a satellite signal. If you are not able to find a satellite signal to verify drive this way, youwill have to actually observe the antenna pedestal while someone else steps the antenna from the TAC-92C. Refer to AZD1.0 to troubleshoot.

2.3 Elevation Drive Test

Select Elevation Entry mode and note the present EL and AGC values. Press the UP or DOWN arrowkey repeatedly to step the antenna position. Verify that the antenna position and AGC change as you


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move on to, or off of, a satellite signal. If you are not able to find a satellite signal to verify drive this way,you will have to actually observe the antenna pedestal while someone else steps the antenna from theTAC-92C. Refer to ELD1.0 to troubleshoot.

2.4 Targeting Test

Targeting is the accurate azimuth and elevation positioning of the antenna in three dimensional space.There are two ways you can target the antenna. They are Satellite Targeting and Azimuth and/orElevation Targeting.

Satellite Targeting is the process of targeting a desired Satellite Longitude (SAT). The TAC-92C thencalculates Azimuth and Elevation angles required to point the antenna at that satellite position from theboats present LAT & LON. The Relative Azimuth (REL) angle is adjusted using the heading (HDG) andthe AZ TRIM values in the TAC-92C to convert it to TRUE Azimuth (relative to TRUE North) and tocompensate for mechanical radome installation error. [TRUE AZ = REL + HDG + AZ TRIM]. Theantenna is then driven to the calculated True Azimuth and Elevation angles.

Azimuth and/or Elevation Targeting is the process of targeting an accurate Relative Azimuth, TrueAzimuth or Elevation angle of the antenna. Relative Azimuth is targeted from the azimuth entry windowby keying in the desired numerical value, pressing the N/S/E/W key and then pressing the ENTER key.True Azimuth is targeted from the azimuth entry window by keying in the desired numerical value andthen pressing the ENTER key. Elevation is targeted from the elevation entry window by keying in thedesired numerical value and then pressing the ENTER key.

Normally, you target a satellite using either of the methods above, the antenna acquires the desiredsatellite, begins tracking it and you are able to watch the desired programming. This seems very simple… but is very complex and can be difficult to troubleshoot (you will have to investigate all of the functionsand tests that relate to any of the “indications” listed below). Repeatable, accurate targeting indicates thefollowing:

• The antenna initialized correctly to its starting REL and EL positions. There is no positive feedback ofactual antenna position. The displayed position values are the result of this starting position value +/-(increment/decrement) all of the steps issued to the AZ/EL motors since initialization was completed.This assumes that the initial pointing angles were achieved during initialization and that every stepissued since then was carried out.

• Azimuth drive is good. All of the steps issued to the AZ motor are being carried out. The antenna isnot binding or dragging in the radome (causing pulse slipping). The drive circuits, motor and belttension are good.

• Elevation drive is good. All of the steps issued to the EL motor are being carried out. The antenna isnot binding or dragging in the radome (causing pulse slipping). The drive circuits, motor and belttension are good.

• Heading input is stable and accurate.

• AZ & EL Trim values are correct.

• LAT & LON settings are correct.

• The LNB is the correct frequency band and polarization type.

• At least one LNB output is energized and the IF signal is being routed to the TAC-92C to develop theAGC to enable the TAC-92C to come out of search and begin tracking the satellite signal.

• The satellite receiver has IF signal input from the correct satellite service and is processing audio &video outputs that are the correct video standard for the television.

• The television is set to the correct input selection (channel number, Line or A/V) and is providing thepicture and sound correspondingly.

2.4.1 Test Targeting

1. While “on satellite”, turn Tracking OFF (press AUX1).


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2. Select Azimuth entry and key in a value +/-100 degrees or more from the presentAZ position.

3. Select Elevation entry and key in a value of 000 or 090.

4. The search LED will flash, indicating that the antenna is targeting to the pointingangles you specified. Allow 30-60 seconds for the antenna to drive away fromthe satellite.

5. Press SAT twice, key in the desired satellite longitude and then press the ENTERkey to re-target the satellite.

6. Verify that the antenna again drives to, and acquires, the desired satellite.

7. If Targeting accuracy is satisfactory, skip to section 2.5 to continue functionaltesting. If the targeting accuracy was not satisfactory, evaluate AZ & EL TRIMvalues to improve targeting accuracy before proceeding.

2.4.2 Evaluate AZ & EL TRIM Values

1. While “on satellite”, turn Tracking OFF (press AUX1).

2. Select Azimuth entry and key in a value +/-100 degrees or more from the presentAZ position.

3. Select Elevation entry and key in a value of 000 or 090.

4. The search LED will flash, indicating that the antenna is targeting to the pointingangles you specified. Allow 30-60 seconds for the antenna to drive away fromthe satellite.

5. Press SAT twice, key in the desired satellite longitude and then press the ENTERkey to re-target the satellite. Press AUX1 to turn tracking OFF so the antennawill not go into search. Press ANTENNA to view the antenna position.

6. When the antenna AZ & EL values stop changing, record the AZ & EL that theantenna targeted to. Press AUX1 to turn tracking ON and allow the antenna totime-out and begin searching OR manually adjust AZ & EL pointing to be ONSatellite.

7. When the desired satellite is acquired, allow tracking to peak up the satellitesignal.

8. When peaked, record the “peak ON satellite” AZ & EL.

9. Evaluate the amount of EL TRIM change that would be required to cause the“ON satellite” elevation to read the “Targeted” value recorded in step 6. [If“Targeted” elevation was 31.0 and “ON satellite” is 32.0, you will need –1.0degrees change to the present EL TRIM to make the “ON satellite” elevationdisplay a value of 31.0 - EL TRIM is entered in tenths … [in this case you wouldsubtract 10 from the present EL TRIM].

10. Evaluate the amount of AZ TRIM change that would be required to cause the“ON satellite” elevation to read the “Targeted” value recorded in step 6. [If“Targeted” azimuth was 180.5 and “ON satellite” is 178.0, you will need +2.5degrees change to the present AZ TRIM to make the “ON satellite” azimuthdisplay a value of 180.5 - AZ TRIM is entered in tenths … [in this case youwould add 25 to the present AZ TRIM].

11. Save the parameter changes and repeat step 2.4 to retest targeting accuracy.


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2.5 AGC Signal Level Tests

When the antenna is not pointed at a satelliteyou should still have some level of AGC,representing the level of background noisefrom space. As you move the antenna closerto a satellite signal you will note that the AGCrise is directly proportional to the amount ofsatellite signal level rise (as shown in thisplot). AGC levels are different for each modelantenna, weather conditions and satellitesignal level.

There should be a very pronounced change inthe AGC value when you switch the inputselection between EXT, INA, INB and IF (EXTshould be very low value) OR when youdisconnect the IF coax from the rear of theTAC-92C while observing the normalselection (i.e. INA). If the AGC does notchange, there is a loss of IF into the AGCtuner or the tuner has failed. AGC Level vs. Antenna Position plot

The AGC value should never be 0000 or 4095.

30-40 counts of AGC is approximately 1dB of satellite signal.

Auto-Threshold will normally set the Threshold at about 3dB above the background noise level.Threshold is a value that the TAC-92C uses to indicate loss of satellite signal so it can initiate a searchpattern. When AGC falls below Threshold the TAC-92C will wait “search delay” number of seconds. Ifthe AGC does not come back above Threshold before the delay time the TAC-92C will initiate a searchpattern in an attempt to acquire/re-acquire a viable satellite signal.

AGC Test1. Record the Peak AGC Level. Turn tracking OFF.

2. From peak, select Azimuth or Elevation Entry mode. Step the antenna UP or DOWNwhile monitoring the AGC Level. The level should rapidly fall to the background noiselevel as the antenna is mispointed.

3. Continue stepping the antenna until it is OFF satellite and record the background noiseAGC level.

4. Evaluate the difference in AGC level (AGC Delta).

5. Step the antenna back to Peak, and turn tracking back ON.

If the Peak AGC is too high you may note that the AGC value does not change as you step the antenna 1degree or more. This could be due to excessive input level which is saturating the tuner. Step theantenna OFF satellite and record position and AGC (about every 0.2 degrees) as you step the antennaback through Peak to OFF satellite (opposite side). Plot the AGC vs. Position on graph paper. If thetuner is being saturated, the resultant curve will be flattened on top rather than a smooth curve to anarrow rounded peak. To correct this, add sufficient attenuation in-line into the tuner to prevent it frombeing saturated.

AGC Delta is commonly 400-700+ on most model antennas while in adequate footprint signal areas. Thisshould provide good Tracking and good satellite receiver signal processing.

AGC Delta of less than 200 indicates poor satellite signal level (weak area of footprint). The satellitereceiver may loose some, or all, programming channels. Tracking will not hold peak signal level aseffectively (it will still track, but programming will be lost).


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2.6 Tracking Test

A simple way to test tracking is to conduct a 4-Quadrant test.

1. Turn tracking OFF2. Select Azimuth Entry mode3. Step the antenna DOWN in AZ until the AGC falls about 100 counts. If the antenna has

Conscan you will see 6s flashing in the lower left of the display. Turn tracking ON andverify that the antenna moves up in azimuth and re-peaks the AGC level.

4. Turn tracking OFF and step the antenna UP in AZ until the AGC falls about 100 counts.If the antenna has Conscan you will see 4s flashing in the lower left of the display. Turntracking ON and verify that the antenna moves down in azimuth and re-peaks the AGClevel.

5. Select Elevation Entry mode, turn tracking OFF and step the antenna UP in EL until theAGC falls about 100 counts. If the antenna has Conscan you will see 2s flashing in thelower left of the display. Turn tracking ON and verify that the antenna moves down inelevation and re-peaks the AGC level.

6. Turn tracking OFF and step the antenna DOWN in EL until the AGC falls about 100counts. If the antenna has Conscan you will see 8s flashing in the lower left of thedisplay. Turn tracking ON and verify that the antenna moves up in elevation and re-peaks the AGC level.

2.7 Heading Testing

Heading input is used for Targeting a satellite (the Heading input is added to the Relative position of theantenna to equal the TRUE Azimuth position of the antenna) and as a long term input to the AzimuthStabilization loop.

The Gyro Type parameter must be set correctly for the type of heading input device.

The heading input must be stable (after power is turned ON, most Gyrocompasses will take 4 hours, ormore, to “settle” and provide a steady heading output). The antenna will not stay pointed ON satelliteif the Heading input is not stable.

The more accurate the heading input is, the more accurate targeting will be. Refer to the paragraph onTargeting Test to check targeting accuracy.

2.7.1 Internal Fluxgate

When using the antenna’s internal fluxgate, the TAC-92C calculates the ship’s heading usingthe fluxgate reference and the relative feedback. The heading value displayed should be within+/- 10 degrees of the boat’s actual heading. If it is not, Fluxgate Compensation needs to beperformed (refer to COMP1.0) or there is external interference on the fluxgate (due to steel ormagnetic mass).

Gyro Type is set to 0000 (0002 can be used on TAC-92C software ver 2.77 or later).

AZ TRIM value is the Magnetic Variation for the geographic location of the boat).

Steel hull boats, or boats with large steel or magnetic masses will cause the internal fluxgate tobe inaccurate (the masses warp the earth’s magnetic field). In this situation, install an external(calibratable) fluxgate, or Gyrocompass, to be used as the heading input for the system.

If the HDG and AZ displays are incorrect by more than +/- 10 degrees or the HDG is not stable(drifts or wanders from the boats actual heading when dockside or on a steady course)troubleshoot using COMP1.0, MINST1.0 & FLUX1.0.

2.7.2 External Fluxgate

When using an external fluxgate (i.e. Ritchie DL-200 or KVH Autocomp 1000) as the headinginput to the TAC-92C, it should be connected to J-13 (NMEA input) on the rear panel of the TAC-92C. Because this input comes into the Aux. Serial Port (J-13) the sum that is entered as theSystem Type Parameter value must include 8 (i.e. 8, 12 or 72).


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Gyro Type parameter is 0000 (0002 should be used on TAC-92C software ver 2.77 or later).NOTE: If the external fluxgate is not energized or the input fails, the TAC-92C may revert tousing the antenna’s internal fluxgate.

The device must be NMEA0183 compliant, be properly installed and calibrated (compensation).

Heading is displayed directly from the device output, you will not be able to enter a “heading”value to correct the display (display will revert to the value read).

The heading value displayed should be within +/- 1.0 degrees of the boat’s actual heading. If it isnot, compensation needs to be performed or the device is not aligned to the bow of the boatcorrectly (refer to the manual for the device).

AZ TRIM value is the sum of the Magnetic Variation for the geographic area +/- any radomemounting error (accuracy of the alignment of the radome so that Relative 360.0 is parallel to thebowline of the boat).

If the HDG is not stable (drifts or wanders +/- 1.0 degree from the boats actual heading whendockside or on a steady course) troubleshoot using the manual for the external fluxgate device.

2.7.3 Gyrocompass - NMEA Heading Output:

When using an NMEA Heading Output from a Gyrocompass as the heading input to the TAC-92C, it should be connected to J-13 (NMEA input) on the rear panel of the TAC-92C. Becausethis input comes into the Aux. Serial Port (J-13) the sum that is entered as the System TypeParameter value must include 8 (i.e. 8, 12 or 72).

Gyro Type parameter is 0000 (0002 can also be used on latest TAC-92C software). NOTE: Ifthe Gyro is not energized or the input fails, the TAC-92C may revert to using the antenna’sinternal fluxgate.

The device must be NMEA0183 compliant, be properly installed and calibrated.

Heading is displayed directly from the device output, you will not be able to enter a “heading”value to correct the display (display will revert to the value read).

The heading value displayed should be within +/- 1.0 degrees of the boats actual heading. If it isnot, the device is not aligned to the bow of the boat correctly (refer to the manual for the device).

Gyrocompass output is TRUE (relative to True North), therefore the AZ TRIM value is ONLY theradome mounting error (accuracy of the alignment of the radome so that Relative 360.0 is parallelto the bow-line of the boat).

Azimuth display will be HDG + REL + AZ TRIM.

If the HDG is not stable (drifts or wanders +/- 1.0 degree from the boat’s actual heading whendockside or on a steady course) troubleshoot using the manual for the Gyrocompass.

2.7.4 Gyrocompass – Step-By-Step (SBS) Heading Output

When using SBS Heading Output from a Gyrocompass as the heading input to the TAC-92C, itmust be connected to TB3 on the Terminal Mounting Strip (Com, A, B & C connections) whichplugs into J-3 on the rear panel of the TAC-92C.

Gyro Type parameter is 0002.

This output is comprised of 6 discrete DC voltage state changes (steps) on the three phase linesper degree of heading change. You MUST enter the heading of the boat EVERY time the TAC-92C power is turned ON to provide an initial heading. Heading is incremented, or decremented,as steps are received from the Gyrocompass.

The heading value displayed should be within +/- 1.0 degrees of the boat’s actual heading. If theheading is incorrect, attempt to enter in the correct heading and then monitor the heading. If thedisplay is still not correct, then there is a problem with the gyro input. This may also cause theerror light to come on.


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Gyrocompass output is TRUE (relative to True North), therefore the AZ TRIM value is ONLY theradome mounting error (accuracy of the alignment of the radome so that Relative 360.0 is parallelto the bowline of the boat).


If the HDG is not stable (drifts or wanders +/- 1.0 degree from the boat’s actual heading whendockside or on a steady course) troubleshoot using the manual for the Gyrocompass.

If you are getting Error Code 0001 or 0002 refer to ERR1.0. Also refer to Ships Gyro Input FaultIsolation below.

2.7.5 Gyrocompass – Synchro Heading Output

CAUTION: Electrical Shock Hazard - Synchro Ships Gyrocompass outputs are commonly110VAC 60 or 400 Cycle. This AC voltage is still present at the Terminal Mounting Strip andinside the TAC-92C when the TAC-92C power is turned OFF.

When using Synchro Heading Output from a Gyrocompass as the heading input to the TAC-92C,it must be connected to TB1 on the Terminal Mounting Strip (R1, R2, S1, S2 & S3 connections)which plugs into J-3 on the rear panel of the TAC-92C.

Gyro Type parameter is set to the correct value for the ratio of the Synchro information AND forthe Synchro Converter (daughter board) installed on the Main PCB inside your TAC-92C. Theratio is the number of AC sinewave transitions on the output phases (S1, S2 & S3) per full 360degree turn of the boat.

1:1 Synchro is Gyro Type 0001



360:1 Synchro is Gyro Type 0360 or 0362 (dependent on Synchro Converter)

You MUST enter the heading of the boat EVERY time the TAC-92C power is turned ON toprovide an initial heading if you are using 36:1, 90:1 or 360:1. Heading is incremented, ordecremented, as sinewave transitions are received from the Gyrocompass.

The heading value displayed should be within +/- 1.0 degree of the boat’s actual heading. If theheading is incorrect, attempt to enter in the correct heading and then monitor the heading. If thedisplay is still not correct, then there is a problem with the gyro input. This may also cause theerror light to come on.

Gyrocompass output is TRUE (relative to True North), therefore the AZ TRIM value is ONLY theradome mounting error (accuracy of the alignment of the radome so that Relative 360.0 is parallelto the bowline of the boat).


If the HDG is not stable (drifts or wanders +/- 1.0 degree from the boats actual heading whendockside or on a steady course) troubleshoot using the manual for the Gyrocompass.

If you are getting Error Code 0001 or 0002 refer to ERR1.0. Also refer to Ship’s Gyro Input FaultIsolation below.

2.8 Underway Testing

Check Heading to assure that the displayed value agrees with the actual heading of the boat. If you areconnected to a Gyrocompass and the display does not follow the Gyrocompass reading correctly refer toShip’s Gyro Input Fault Isolation section below.

Monitor the signal level while the system is tracking the satellite and the boat is underway. Excessivesignal level variations that occur in sync with the motion of the boat may indicate that stabilization is notoperating correctly.


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2.9 Initialization Test

If you have isolated problems to the antenna (Targeting, Stabilization or Tracking) this is the best test tostart troubleshooting the antenna with. In many cases it is very difficult to open the radome and view thepedestal … but it is by far the best test to start with.

Remove the radome top. Cycle the TAC-92C power off. With power off, rotate the Level Platform fullyCW against the stop, tilt the antenna about 10 degrees off level and rotate the antenna to point straight upat zenith.

Refer to MECH1.0, VIS1.0 and INIT1.0. Have someone turn TAC-92C power ON while observing theantenna as it begins its initialization, which continues for approximately 2 minutes.

2.10 Rate Sensor / Stabilization Test

If all the functions during initialization are correct, then turn tracking or searching off after the antennatargets, to test the rate sensors. All three rate sensors require 12 volt DC input and will output 2.5 volts+/- 100 MV with no motion across the rate sensor axis. When motion is applied, the rate sensor has avoltage range of 0 to 5 VDC (+/- 2.5) depending on the direction of the motion. Perform the followingchecks to isolate any problems.

1. Turn tracking and/or searching off to stop the antenna from moving.

2. Slightly loosen the three Philips screws securing the Elevation rate sensor mountingplate. “Wiggle” the rate sensor and observe the elevation motor react by moving theantenna in the opposite direction of the applied motion. Tighten screws when finished. Ifthe antenna does not react in elevation, follow ELR1.0.

3. Slightly loosen the three screws securing the Cross Level rate sensor. “Wiggle” the ratesensor and observe the cross level motor react by moving the cross level beam in theopposite direction of the applied motion. Tighten screws when finished. If the antennadoes not react in cross-level, follow CLR1.0.

4. Slowly move the Azimuth rate sensor back and forth and observe the azimuth motormove the antenna pedestal in the opposite direction of the applied motion. If the antennadoes not react in azimuth, follow AZR1.0.

2.11 Fluxgate Compensation Test

The fluxgate is located in the level platform assembly on the antenna. The demodulation circuit for thefluxgate is in the PCU (Pedestal Control Unit). Sea Tel compensates the fluxgate on all antennas andPCUs before shipment. However, once installed on the boat, compensation should be performed tocalibrate the fluxgate to the new location. Also, if the PCU or fluxgate is ever replaced, a compensationshould be done to match the new hardware. Use the following procedures at the TAC-92C tocompensate the fluxgate. Use the troubleshooting modules to isolate any failures.

1. Press [MODE] until the display reads “REMOTE COMP”. Press the [↑] key and thenpress [ENTER] to start fluxgate compensation. The display should now read “PLEASEWAIT”. The antenna will rotate from the CW stop, nearly 540 degrees, close to the CCWstop. This procedure will take approximately 2 minutes. When the test is complete, thedisplay will read either “COMP COMPLETE”, “COMP RANGE ERROR” or “COMP GAINERROR”.

2. COMP COMPLETE: This indicates a successful compensation.

§ Press [MODE] until the display reads “REMOTE PARAMETERS”

§ Press the [↑] key and then press [ENTER]. This will save the new compensationparameters to NVRAM in the PCU.

3. COMP RANGE ERROR: This indicates a problem at the antenna or external magneticinterference.

ANTENNA: 3 possible problems with the antenna.§ A bad fluxgate compass. Use FLUX1.0 to isolate.


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§ Faulty wiring from the fluxgate to the PCU (Pedestal Control Unit). Use FLUX1.0 toisolate.

§ If the tests above check out satisfactory, then replace the PCU and follow theRemote Compensation Procedure to calibrate the new PCU.

EXTERNAL MAGNETIC INTERFERENCE:§ Check for equipment within 4-5 feet of the antenna, which may contain magnets, or

large amounts of steel.

§ If the boat is steel or there are magnetic objects that cannot be relocated, then thesolution is to interface the system with a Ship’s Gyrocompass (S-B-S or Synchro) oran EXTERNAL Fluxgate compass (Ritchie DH-200 or KVH Autocomp 1000).

4. COMP GAIN ERROR: This error will occur if there is not enough signal for the fluxgate.If there is too much signal a “COMP RANGE ERROR” will probably occur first. If thesystem has worked well until the boat traveled to a northern latitude, the problem is mostlikely not enough signal for the fluxgate to accurately process. To rule out a faultyfluxgate, follow FLUX1.0. Other causes could be from external magnetic interference(i.e., steel, and magnets).

3 Symptom / Problem Scenarios

3.1 Antenna Drifts Off SatelliteImproper tracking, parameter settings, rate sensor disturbance or problems with thefluxgate/Gyrocompass can cause drifting off the satellite after lock.

Verify that the tracking parameters (EL STEP SIZE, AZ STEP SIZE and STEP INTEGRAL) are setcorrectly.

If the system is using the internal fluxgate compass, use the Fluxgate Compensation procedure to isolatethe problem (COMP1.0 & FLUX1.0).

If the system is interfaced with the ship’s gyro, check the heading display on the TAC-92C and verify thismatches the ship’s heading on the Gyrocompass.

Use the Heading Input tests and fault isolation sections to isolate the problem.

If the Heading Input is found to be good, refer to INIT1.0 to check Initialization of the antenna, thenAZR1.0, CLR1.0 and ELR1.0 to troubleshoot the rate sensors.

3.2 Channels Freeze Frame

Many times this will only occur on certain channels. This could be due to heavy rainfall or the shipoperating on the edge of the satellite footprint.

Also, a common problem is the F connectors are not securely fastened. Tighten all of these connectorsand re-check the system operation.

If all channels are freeze framing, check to see if the TAC-92C is maintaining steady tracking of thesatellite (Tracking LED steadily lit).

If some channels are good, the tracking light is on and the antenna is pointed at the correct azimuth andelevation angle, then troubleshoot only the RF distribution to the receivers or the receivers themselves. Inboth cases the TAC-92C should be configured to output 10-21 VDC to the LNB. Verify the configurationby checking that the SYSTEM TYPE is set to 0072 or 0076.

Check the AGC on the TAC-92C, referring to AGC Signal Level Tests.

If the AGC is good, use the IF Distribution Test.

Voltage output is low, zero or too high (greater than 22VDC) replaced the AGC RECEIVER PCB P/N113037.


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If voltage is good at the TAC-92C output, then check the voltage at the LNB. This voltage should beapproximately 18 volts at the input of the LNB on the antenna.

If voltage output is low or not there at all, do a continuity check of all coax cables leading from the TAC-92C to the LNB.

If the voltage is good, but AGC shows below 800, then swap the two cables at the LNB outputs. Checkthe AGC again. If AGC is still below 800, replaced the LNB.

Also refer to SIG1.0 to troubleshoot.

3.3 Constant Unwrap LED

An unwrap occurs when the PCU reads the antenna pedestal is close to one of the two azimuthmechanical stops. The mechanical stops should be at a Relative position of 0090 and 0630, allowing theantenna 540 degrees of rotation. When the antenna is in the center of this mechanical range of rotation,the REL position of the antenna is 360.0 and the system should be facing in line with the bow. When therelative position of the antenna is within 5 degrees of one of the stops an unwrap will be electronicallyinitiated (at 095.0 REL or 620.0 REL) and the antenna will be driven 360 degrees (plus or minus headingchanges during the unwrap) away from that mechanical stop. The PCU will send an unwrap indicatorback to the TAC-92C, which will turn on the red unwrap LED. Usually, an unwrap is completed inapproximately 20-30 seconds.

This is a normal operation of the antenna and satellite programming will be lost until the antennacompletes unwrapping. The antenna should reacquire the satellite without intervention from the operator.

On systems with an encoder, the PCU monitors the encoder output to decide when an unwrap shouldoccur. If the encoder output fails, the system may stay in unwrap. For ENCODER equipped systemsrefer to ENC1.0 & UNWRAP1.0 to troubleshoot.

On systems without an encoder, an unwrap failure can happen if the pedestal movement is restricted atany time (i.e., antenna scraping inside of dome or cables inside radome catching on pedestal). In“encoder-less” systems, refer to UNWRAP1.0 to troubleshoot.

3.4 Heading Input Fault Isolation

If the heading input source is inaccurate or unstable that antenna may not be able to target or stay onsatellite. The heading display should follow the heading source exactly, if the display is not updating, notstaying accurate or is changing opposite to what the input source is doing use the procedures below toisolate the problem.

If you are getting Error Code 0001 or 0002 also refer to ERR1.0.

3.4.1 Internal Fluxgate Fault Isolation

If the system is using its own internal fluxgate compass, the difference could be as much as 5-10degrees. As long as the system locates the satellite within a reasonable time (2-3 minutes afterinitialization), then this is not a problem. If then TAC-92C heading is off by more than 15-20degrees and takes longer than 10 minutes to find the satellite or does not find it, then try tocompensate the fluxgate compass. Refer to Fluxgate Compensation Test above to compensatethe fluxgate and use FLUX1.0 to troubleshoot.

3.4.2 Ships Gyrocompass Fault Isolation - General

All gyro types except 1:1 & NMEA require the operator (user) to input the ship heading in theTAC-92C HDG display each time the system is turned ON. The gyro input can be checkedunderway or by manually slewing the gyro in port.

CAUTION: Electrical Shock Hazard - Synchro Ships Gyrocompass outputs are commonly110VAC 60 or 400 Cycle. This AC voltage is still present at the Terminal Mounting Strip andinside the TAC-92C when the TAC-92C power is turned OFF.

Check the GYRO TYPE parameter to assure that the correct value is entered to correctly readthe output from the Gyrocompass. The available gyro types are:

§ 0000 for NMEA O183 Heading Output, wired to the Aux. Serial Port Adapter (J13)


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§ 0001 for 1:1 input (usually installed on older military)

§ 0002 for S-B-S (Step-By-Step) installed on some yachts and commercial vessels§ 0036 for 36:1 (usually on military boats)

§ 0090 for 90:1 (rare)§ 0360 for 360:1 (on yachts and some commercial)§ 0362 for 360:1 (on yachts and some commercial)

3.4.3 SBS Gyrocompass Output [DC Voltage Signaling]

You MUST enter the heading of the boat EVERY time the TAC-92C power is turned ON toprovide an initial heading. Heading is incremented, or decremented, step transitions are receivedfrom the Gyrocompass.

If there is no error light but the heading on the TAC-92C moves the wrong direction, then swapthe A and B leads.

If the Error LED (error code reads 0001) and the error will not clear, check the gyro-input voltagesat TB6 on the terminal mounting strip. Measure the voltage from COM to A, B & C respectively.One or two legs should be high (+ or – voltage level) and one or two will be low (below 10 VDC).All three legs should never be High or Low at any instant in time (violation of Gyro truth table,which causes Error 0001). If not, check the ship’s gyro output.

Voltage on high leg should be approximately (+35, -35, +70, -70), depending on the voltage levelof the gyro being used.

Voltage on low leg must be below 10 volts. AC or noise spikes on the line is the most commoncause of Error code 0001 (two lines are high and the low line has noise which is interpreted bythe TAC-92C as a high state … therefore, all three lines appear to be high which is an illegalstate).

Measure from chassis ground to COM and the voltage should be a constant (0 volts, +/-35 or +/-70), without varying more than a few volts up and down. If it does vary with ship’s movement (i.e.low to high to low), then this is probably not the COM leg. Re-wire as necessary. Verify that theCOM has not been wired to the lamp output of the gyro. This would probably give a reading of~15-20 VDC.

Refer to ERR2.0 for more information and troubleshooting.

3.4.4 Synchro Gyrocompass Output [AC Voltage Signaling] (36:1, 90:1 or 360:1)

You MUST enter the heading of the boat EVERY time the TAC-92C power is turned ON toprovide an initial heading if you are using 36:1, 90:1 or 360:1. Heading is incremented, ordecremented, as sinewave transitions are received from the Gyrocompass.

After initialization of the system and setting the ship’s heading into the TAC-92C HDG display,verify the heading on the TAC-92C follows the gyro. If the gyro turns in the wrong direction, swapthe S2 and S3 leads at TB7.

3.4.5 Synchro Gyrocompass Output [AC Voltage Signaling] (1:1 ONLY)

You CANNOT enter the heading of the boat when you are using 1:1 Synchro input. The headingis directly read by the TAC-92C based on the relationship of S1, S2 and S3 sinewaves.

Gyro Type parameter setting is 0001. After initialization, the HDG display should read the sameas the ship’s gyro.

• If the Heading display reads 180 degrees opposite the ship’s gyro, then swap the R1 &R2 inputs to TB7 of the Terminal Mounting Strip. Press [RESET] to verify change in HDGdisplay.

• If the Heading display reads 60 or 300 degrees from ship’s gyro, swap the R1 & R2 leadsand then rotate the S1, S2 & S3 leads either forward or backward one position. Press[RESET] to verify changes.


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• If the Heading display reads 120 or 240 degrees from ship’s gyro, rotate the S1, S2 & S3connections either forward or backward one position and press [RESET].

3.5 IF Distribution Problem

Set each satellite receiver to the signal meter. Set one of the receivers to an odd transponder (i.e. 3,5,7)and another receiver to an even transponder (i.e. 2,4,6). This will isolate whether the channel freeze ison one polarity or both. Also, check the interconnection of the system. Check to see if there is a multi-switch and check if one coax is looped through the TAC-92C or directly connected to RF IN A on the rearpanel. With multiple receivers, both coax cables from the radome should connect directly to the multi-switch. Be sure the connections are correct before troubleshooting any further; refer to the appropriateSystem Interconnect, Wiring or Block Diagrams for your system.

IF SIGNAL LEVEL LOW OR ZERO ON ONE POLARITY (i.e. odd or even transponder)

Set all receivers to the polarity (even or odd transponder) that shows a problem. Do all receivers showthe same problem?

YES

§ Swap the cables on the input to the multi-switch. This will change the cable and LNBoutput that is feeding each polarity.

§ If the problem stays on the same polarity, then change the multi-switch.§ If the problem moves to the other polarity, then check the coax cable feeding that polarity.

The multi-switch is marked at the inputs 13/14 VDC and 17/18 VDC. The low voltage feedsthe odd transponders and the high voltage (17/18) feeds the even transponders. If thecable checks out okay, then replace the LNB.

NO

§ The coax leading from the multi-switch to the receiver may be bad. Check continuity.§ If the cable is okay, check the output of the TAC-92C at RF IN A. Output should be

approximately 20 volts.

§ If the voltage is okay, the multi-switch may be bad. Swap the multi-switch output cable withanother one that is good. If the problem moves to the other receiver, replace the multi-switch. If the problem stays with the same receiver, then re-check the cable. If the cable isgood, replace the receiver.

IF SIGNAL LEVEL IS LOW OR ZERO ON BOTH EVEN AND ODD TRANSPONDERS

The problem may be weather related. KU-band is very susceptible to rain and/or moisture attenuation.

Check the area of operation. Boat may be at the edge of the footprint for the system.

Check all F connectors and verify all IF connections are secure.

Also refer to SIG1.0 for troubleshooting IF Signal problems.

3.6 Remote Not Responding

This problem occurs if there is a loss of communication between the PCU and the TAC-92C. Thecommunication is RS-422 carried on four (4) conductors in the control cable. Refer to ERR4.0 and thefollowing to isolate the problem.

3.7 TAC-92C Display Blank

If the display does not illuminate when the TAC-92C power switch is turned ON, check the following itemsto help isolate the problem:

Check to assure that the correct level of AC Voltage is available at the outlet and at the TAC-92C end ofthe power cord. Extract the Voltage Select/Fuse Holder Module from below the plug receptacle and testboth fuses. Plug the module back in (correct voltage selection) to the TAC-92C power module, plug thepower cord in also. If power or fuse fault was found, turn power ON, check the display and continueoperation.

To isolate shorted input connections:


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Turn power OFF, disconnect J1, turn power ON and check the display. If the display is lit, refer toACC1.0 and SPOOL1.0.

Turn power OFF, disconnect J3, turn power ON and check the display. If the display is lit, troubleshootGyrocompass connections for shorts.

Turn power OFF, disconnect J11, turn power ON and check the display. If the display is lit, troubleshootthe Aux. Serial Port input connections for shorts.

Turn power OFF, disconnect J13, turn power ON and check the display. If the display is lit, troubleshootAux. Serial Port input connections for shorts.

If the display is still not lit, open the TAC-92C and test the AC Voltage at the terminal barrier strip for thetransformer input. Refer to TAC1.0 to troubleshoot further.

Series 94 Troubleshooting Guide ACC

Step Check/Test to perform Results Action to take - step togo to

- 4-1 -

ACC1.0 Antenna Control Cable

Refer to drawing 114787 Shielded ControlCable Assembly ACU to PCU

ACC1.1 Turn TAC-92C power OFF. Visually inspectantenna control cable connections.

Yes Straighten, reseat or replacepins as needed and re-check.

At the Antenna Control Unit, disconnect P1and visually inspect connector. Are any pinsbent, broken or pushed into the body of theconnector?

No


At the antenna, disconnect the 9-pin circularplug and visually inspect. Are any pins bent,broken or pushed into the body of theconnector?

No

ACC1.2 Continuity checks

Install DE-9 loop-back continuity testconnector (shorts 1-2, 3-4, 5-6, 7-8 and 9-shield) on P1 at the ACU end of the antennacontrol cable.

YesCheck continuity of the Antenna Control Cableat the Antenna 9-pin Circular connector Plug:

Circ-1 to Circ-2 = ShortCirc-3 to Circ-4 = ShortCirc-5 to Circ-6 = Short

Circ-7 to Circ-8 = ShortCirc-9 to Circ-spade = Short

Is continuity good?

No Repair harness and re-check

Remove the DE-9 loop-back continuity testconnector from P1.

Yes Repair and re-checkCheck P1 continuity from metal body (shield)to pins:P1-1 to Shield = OpenP1-2 to Shield = Open

P1-3 to Shield = OpenP1-4 to Shield = Open

P1-5 to Shield = OpenP1-6 to Shield = OpenP1-7 to Shield = Open


Is harness shorted?

No

ACC Series 94 Troubleshooting Guide


- 4-2 -

Yes Repair and re-checkCheck P1 continuity from pin to pin:

P1-1 to P1-2 = OpenP1-1 to P1-3 = Open

P1-1 to P1-4 = OpenP1-1 to P1-5 = OpenP1-1 to P1-6 = Open














Are harness lines shorted?

No

Yes ReturnWere repairs made to the harness in theprevious three steps? No

Series 94 Troubleshooting Guide ACC


- 4-3 -

ACC1.3 DC Voltage checks

ACC1.3.1 Re-connect antenna control cable and turnTAC-92C power ON. Check the DC Voltagefrom C48 to ground on the TAC-92C MainPCB. Record the DC voltage.

ACC1.3.2 Check the DC Voltage at the Pol Aux RelayPCB from P1-3 (+28VDC) to P1-6 (ground).Record the DC voltage

Yes ReturnSubtract the voltage recorded in stepACC1.3.2 from the voltage recorded in stepACC1.3.1. Is the loss across the antennacontrol cable less than 3.0VDC?

No

Yes Repair or replace the antennacontrol cable and re-testACC1.3

Is the antenna control cable 100 ft or less inlength?

No Contact Sea Tel Servicedepartment for instructions oninstalling junction boxes andheavier gage antenna controlcable conductors. Correctthen re-test ACC1.3

AZD Series 94 Troubleshooting Guide


- 4-4 -

AZD1.0 Azimuth Drive problems

Refer to the Antenna System Schematic andthe Pedestal Harness Schematic drawings forall voltage and continuity checks.

Yes Return

Yes, Azimuthdrives but notconsistently

AZD1.2

No, Azimuthdrives thewrongdirection.

AZD1.6

AZD1.1 Test Azimuth drive to determine the nature ofthe drive problem. Turn the TAC-92C powerON, turn tracking OFF (press AUX1) andobserve azimuth drive while the antenna isinitializing, or while stepping, slewing ortargeting azimuth. Does the antenna driveproperly in azimuth?

No Azimuthdrive.

AZD1.2

AZD1.2 No Azimuth drive or drive is not consistent

Turn TAC-92C power OFF and removeradome top (or open the radome door):

Yes Contact Sea Tel Servicedepartment

Inspect inside of radome for signs that thedish or feed have been rubbing against theinside of the fiberglass radome. Are theresigns of rubbing?

No

YesRotate the pedestal through 540 degree rangeof azimuth motion. The antenna should rotatefreely and easily with light finger pressure. Dothe azimuth bearings rotate freely with nobinding in Azimuth?

No Contact Sea Tel Servicedepartment

Yes Re-route or tie cables awayfrom pedestal and re-check.

Assure that the cables in the base of theradome are not restricting or binding the freerotation of the pedestal. Is there cablerestriction noted?

No

Yes Replace or re-tension the beltand re-check.

Check the azimuth drive belt. Is the beltbroken or loose?

No

YesIs the 44 pin connector (P1) properly mated tothe PCU? No Re-mate connection and re-

check

YesAre the harness and motor IDC connections(J4 & J5) mated properly on the terminalboard (TB1)?

No Re-mate connection and re-check

Yes Repair and re-check.Are any wires in the IDC connectors (J4 & J5)broken or frayed? No

Series 94 Troubleshooting Guide AZD


- 4-5 -

Turn TAC-92C power ON

AZD1.3 +12VDC test

Yes > 11VDC

No, voltage islow (< 11VDC)or missing

AZD1.7

Check the DC Voltage on J4 and J5, from pin3 to ground and pin 4 to ground. Is the +12.0VDC OK?

No, voltage isgood on J4but missing onJ5

Repair/replace TB1 and re-check

AZD1.4 Motor (M1) Continuity

YesDisconnect P5 and check continuity of themotor windings, measure from:P5-1 to P5-3 or 4 ~25Ù

P5-2 to P5-3 or 4 ~25ÙP5-5 to P5-3 or 4 ~25Ù

P5-6 to P5-3 or 4 ~25ÙP5-1 to P5-2 ~50ÙP5-5 to P5-6 ~50Ù

Is motor winding continuity good?

No Motor Open - Replace motorand re-check

Yes Motor shorted - Replacemotor and re-check

Check continuity of the motor windings toground:

P5-1 to ground = OpenP5-2 to ground = Open

P5-3 to ground = OpenP5-4 to ground = OpenP5-4 to ground = Open

P5-6 to ground = OpenIs the motor shorted?

No AZD1.5

Yes ReturnReconnect P5 and re-test azimuth drive. Isazimuth drive restored? No AZD1.5

AZD1.5 Harness Continuity

AZD1.5.1 Turn TAC-92C power OFF.


Disconnect P1 from the PCU and visuallyinspect P1. Are any pins bent, broken orpushed into the body of the connector? No

YesDisconnect P4 and check continuity from:P4-1 to P1-28 = ShortP4-2 to P1-26 = Short

P4-4 to P1-44 = ShortP4-5 to P1-8 = Short

P4-6 to P1-5 = ShortIs continuity good?




- 4-6 -

Yes Repair harness and re-checkCheck continuity from:







P4-5 to P4-6 = OpenIs harness shorted?

No

Yes AZD1.1AZD1.5.2 Were repairs made to the harness in theprevious three steps?

No

Yes ReturnReplace PCU (failed drivers), re-connect allcables and turn TAC-92C power ON. IsAzimuth drive restored? No Contact Sea Tel Service

department

AZD1.6 Azimuth drives wrong direction

YesVerify motor wire color code to P5 perPedestal Harness Schematic. Is the P5 wiredcorrectly?

No Replace motor and re-check

YesVerify correct software in PCU. Is thesoftware correct for the antenna model? No Replace PCU software with

correct version and re-check

Yes AZD1.5Plug spare motor (unmounted) into TB1.Does spare motor turn same direction as theinstalled motor?

No Replace motor and re-testAZD1.1

AZD1.7 +12VDC is low (< 11VDC) or missing

YesAZD1.7.1 Is the +12.0 VDC approximately half thenominal voltage? No AZD1.7.3

YesCheck the Voltage Select/Fuse block in thepower module on the rear panel of TAC-92C.Is it set for the correct AC line voltage?

No Set for correct AC voltagethen next

Yes > 11VDC Re-test AZD1.1AZD1.7.2 Re-check DC voltage from J4 and J5 pin 3 toground and pin 4 to ground. Is the +12.0 VDCOK now? No

Yes Motor short – Replace motorthen AZD1.7.2

AZD1.7.3 Disconnect P5 from TB1 and check +12VDCfrom P4 pin 4 to ground. Is the +12.0 VDCOK? No

Series 94 Troubleshooting Guide AZD


- 4-7 -

Yes TB1 short - Repair/replaceTB1, then AZD1.7.2

Disconnect P4 from TB1 and check +12VDCfrom P4 pin 4 to ground. Is the +12.0 VDCOK? No

Yes Harness open/short –AZD1.5.1 then next

Disconnect P1 from the PCU and check theDC voltage From J1 pins 40, 41, 42, 43 and44 to ground. Is the +12.0 VDC OK? No AZD1.7.4

Yes AZD1.7.2Turn TAC-92C power OFF and reconnect P1,P4 and P5. Turn TAC-92C power ON and re-check DC voltage from J4 and J5 pin 3 toground and pin 4 to ground. Is the +12.0 VDCOK?

No Pedestal Harness short –Isolate shorted wire(s) orcomponent(s), repair and re-check

AZD1.7.4 Turn TAC-92C power OFF. Install the 15-PinIn-Line Test-Point connector between P2 andthe PCU. Turn TAC-92C power ON.

Yes +12VDC regulator failure -Replace PCU then AZD1.8

Check DC voltage from P2-15 to groundunder load. This may also be done byopening the back-shell of P2 to access pin 15OR by opening the PCU and access on U14pin 5. Is the voltage +24VDC or greater?

No

Yes Pol/Feed short – isolate,repair and re-check

Monitor the voltage from P2-15 to ground andunplug P1 from the Pol Aux Relay PCB. Isthe voltage +24VDC or greater when P1 isunplugged?

No

Yes Pedestal short – isolate,repair, and re-check

Monitor the voltage from P2-15 to ground andunplug P1 from PCU. Is the voltage +24VDCor greater when PCU P1 is unplugged? No

Yes PCU short – replace PCU,then AZD1.8

Unplug P2, remove the 15-Pin In-Line Test-Point connector from PCU and check thevoltage from P2-15 to ground. Is the voltage+26VDC or greater?

No

Yes Spool cable – SPOOL1.0then AZD1.8

AZD1.7.5 Unplug the 9-pin Circular plug from thebracket (jack) in the base-pan of the radome.Check the DC voltage at the plug from pin 9 topin 5. Is the voltage +26VDC or greater?

No

Yes ACC1.0 then AZD1.8AZD1.7.6 Unplug P1 from the rear panel of the ACU andcheck the DC voltage from J1-9 to J1-5. Is thevoltage +26VDC or greater?

No

Yes Loss of +28VDC path –Replace Main PCB thenAZD1.8

Remove top cover of the TAC-92C and testDC voltage from Main PCB connector J5-3 toground. Is the voltage +26VDC or greater?

No

YesAZD1.7.7 Turn the TAC-92C Power OFF, unplug the ACline cord from the rear panel and extract thevoltage select block. Test both fuses (250V2Amp Slow-Blow). Are BOTH fuses good?

No Replace fuse(s) then next



- 4-8 -

Yes AZD1.8Re-insert the voltage select block (assure it isin the correct orientation for the AC linevoltage) and re-install the AC line cord. TurnTAC-92C power ON and test DC voltage fromMain PCB connector J5-3 to ground. Is thevoltage +28VDC restored (> +26VDC)?

No TAC1.0 then AZD1.8

Yes > 11VDC Re-test AZD1.1AZD1.8 Turn TAC-92C power OFF and reconnect allunplugged connections. Reinstall ACU &PCU covers as necessary. Turn TAC-92Cpower ON and re-check DC voltage from J4and J5 pin 3 to ground and pin 4 to ground. Isthe +12.0 VDC OK now?

No Contact Sea Tel ServiceDepartment

Series 94 Troubleshooting Guide AZR


- 4-9 -

AZR1.0 Azimuth Rate Sensor

AZR1.1 Test for rate sensor read errors which maycause any of the following symptoms;

1. Antenna drives to the stops when initializingor targeting a new azimuth.2. Antenna does not stabilize in azimuth axisproperly.3. The Unwrap LED may be frequently orconstantly lit.

4. Antenna may oscillate in azimuth from oneend stop to the other end stop.

Refer to the Antenna System Schematicand the Pedestal Harness Schematicdrawings for all voltage and continuitychecks..

Fig 1 Azimuth rate sensor and connection.

AZR1.2 Turn TAC-92C power OFF and removeradome top (or open the radome door):


AZR1.2.1 Disconnect P1 from the PCU and visuallyinspect P1. Are any pins bent, broken orpushed into the body of the connector? No

YesAZR1.2.2 Measure continuity from the metal body of therate sensor to pedestal ground (=Open). Isthe rate sensor isolated from ground?

No AZR1.3

YesAZR1.2.3 Refer to figure 1. If the rate sensor is installedupside-down (connector down) the antennamay oscillate from one azimuth stop to theother. Is the rate sensor mounted in thecorrect orientation?

No Re-install in correctorientation

AZR1.2.4 Remove the conductive tape from the ratesensor. Save tape to reinstall later.

YesRefer to figure 1. Is the IDC connection (P18)mated properly in the rate sensor.? No Re-mate connection and re-

check

Yes Repair and re-check.Are any wires in the IDC connector (P18)broken or frayed? No

AZR Series 94 Troubleshooting Guide


- 4-10 -

Yes Tighten the two Philipsscrews to secure themounting plate to the levelcage and re-check.

AZR1.2.5 The rate sensor must be firmly mounted to thelevel cage. Grip the body of the rate sensorwith thumb and fore-finger of one hand whileholding the level cage firmly in the other hand.Gently wiggle the rate sensor. Is themounting plate loose on the level cage?

No

YesAZR1.2.6 The rate sensor must be firmly mounted to its’mounting plate. Grip the body of the ratesensor with thumb and fore-finger of one handwhile holding the level cage firmly in the otherhand. Gently wiggle the rate sensor. Is therate sensor loose on the mounting plate?

No AZR1.5

Yes Replace the rate sensormounting plate and re-check.

Remove the two Phillips screws that attachthe mounting plate to the level cage, tightenthe rate sensor mounting screws and re-check. Is the rate sensor still loose on themounting plate?

No Re-install the mounting plate(and rate sensor) on the levelcage and re-check AZR1.2.5

AZR1.3 Rate sensor isolation

YesRemove the conductive tape and checkcontinuity from the metal body of the ratesensor to pedestal ground (=Open). Is therate sensor still shorted to pedestal ground?

No Tape was shorting – re-checkAZR1.2.2

Yes AZR1.4.1, then re-checkAZR1.2.2

Remove the two Philips screws to detach themounting plate (and rate sensor) from thelevel cage. Is the rate sensor still shorted topedestal ground?

No Screws were shorting - Next


Tighten the rate sensor mounting screws andre-check. Is the rate sensor still loose on themounting plate? No Re-check AZR1.2.2

AZR1.4 Harness continuity

YesAZR1.4.1 Disconnect P1 & P18 and check continuityfrom:P18-1 to P1-34 = ShortP18-4 to P1-18 = Short



Yes Repair harness and re-checkCheck continuity from:P18-1 to ground = Open

P18-4 to ground = OpenP18-5 to ground = OpenP18-1 to P18-4 = Open


Is harness shorted?

No

Yes AZR1.1AZR1.4.2 Were repairs made to the harness in theprevious three steps? No

Series 94 Troubleshooting Guide AZR


- 4-11 -

AZR1.5 Nominal output voltage

Reconnect P1 and P18. Turn TAC-92Cpower ON

Assure that the boat is not moving at the pierand disconnect P5 (azimuth motor) from TB1.The pedestal is not to be rotated whilemonitoring the rate sensor output voltage (ratesensor not being rotated in free space).

YesMonitor the rate sensor output DC voltagefrom P18 pin 4 to ground. Nominal when therate sensor is not being rotated is 2.50VDC+/-100mV. Is the voltage OK?

No AZR1.7

AZR1.6 Output voltage varies with motion

Yes AZR1.8Rotate the antenna in azimuth whilecontinuing to monitor the output voltage. CWrotation should cause the output to increaseabove 2.50VDC and CCW rotation causes thevoltage to decrease below 2.50VDC. Theamount of increase/decrease from nominal isproportional to the rate of rotation. Does theoutput vary as the antenna is rotated?

No Replace rate sensor and re-check AZR1.5

Yes Replace rate sensor and re-check AZR1.5

AZR1.7 Measure the DC voltage from P18 pin 5 toground (metal body). Is the 12 VDC OK?

No

Yes AZR1.4.1, then re-checkAZR1.5

Disconnect P1 from the PCU and check theDC voltage from J1 pin 40 to ground. Is the+12VDC OK? No Replace PCU and re-check

AZR1.5

Yes AZR1.9AZR1.8 Re-connect P5 (azimuth motor) to TB1 andturn TAC-92C ON. Loosen the two Philipsscrews securing the rate sensor mountingplate, grip the rate sensor with your finger andthumb and gently “wiggle” (rotate left-right) therate sensor. Does azimuth drive the pedestalin response to rotation of the rate sensor?

No AZR1.4.1, then next

Yes Re-check AZR1.5Were repairs made during the harnesscontinuity checks? No Replace PCU and re-check

AZR1.8

YesAZR1.9 Turn TAC-92C OFF. Tighten the two Philipsscrews to secure the rate sensor mountingplate to the pedestal. Re-install theconductive tape over the rate sensor IDCconnection. Assure that the tape does notshort any of the wires in the IDC connectorand does not short the body of the rate sensorto the pedestal ground or the harnessshield/braid. Re check AZR1.3. Is the ratesensor isolated from ground?

No Re-tape and re-check

Reconnect P1 to the PCU and turn TAC-92Cpower ON

Return

CLD Series 94 Troubleshooting Guide


- 4-12 -

CLD1.0 Cross Level Drive problems

Refer to the Antenna System Schematicand the Pedestal Harness Schematicdrawings for all voltage and continuity checks.

Yes Return

Yes, CrossLevel drivesbut notconsistently

CLD1.2

No, CrossLevel drivesthe wrongdirection.

CLD1.6

CLD1.1 Test Cross Level drive to determine thenature of the drive problem. Tilt the crosslevel beam about 10 degrees off level, thenturn the TAC-92C power ON and observeCross Level drive while the antenna isinitializing. Does the antenna drive properly inCross Level?

No CrossLevel drive.

CLD1.2

CLD1.2 No Cross Level drive or drive is notconsistent




No

YesRotate the pedestal through ~60 degreerange of Cross-Level motion (tilt). Theantenna should rotate freely and easily withlight finger pressure. Do the Cross-Levelbearings rotate freely with no binding inCross-Level?


Yes Re-route or tie cables on thepedestal and re-test.

Assure that the cables on the pedestal are notrestricting or binding the free rotation of thepedestal. Is there cable restriction noted? No

Yes Replace or re-tension the beltand re-test.

Check the Cross Level drive belt. Is the beltbroken or loose?

No

YesIs the 44-pin connector (P1) properly mated tothe PCU? No Re-mate connection and re-

test


No Re-mate connection and re-test

Yes Repair and re-test.Are the wires in the IDC connectors (J7 & J8)broken or frayed? No

Series 94 Troubleshooting Guide CLD


- 4-13 -


CLD1.3 +12VDC test

Yes > 11VDC

No, voltage islow (< 11VDC)

CLD1.7

Check the DC Voltage on J7 and J8, from pin3 to ground and pin 4 to ground.

+12.0 VDC OK?



CLD1.4 Motor (M2) Continuity

YesDisconnect P8 and check continuity of themotor windings, measure from:

P8-1 to P8-3 or 4 ~25ÙP8-2 to P8-3 or 4 ~25ÙP8-5 to P8-3 or 4 ~25Ù

P8-6 to P8-3 or 4 ~25ÙP8-1 to P8-2 ~50Ù

P8-5 to P8-6 ~50ÙIs motor winding continuity good?

No Motor open - Replace motorand re-check






No CLD1.5

Yes ReturnReconnect P8 and re-test Cross Level drive.Is Cross Level drive restored? No CLD1.5

CLD1.5 Harness Continuity

CLD1.5.1 Turn TAC-92C power OFF.









- 4-14 -

Yes Repair and re-checkCheck continuity from:








No

Yes CLD1.1CLD1.5.2 Were repairs made to the harness in theprevious three steps?

No

Yes ReturnReplace PCU (failed drivers), re-connect allcables and turn TAC-92C power ON. IsCross Level drive restored? No Contact Sea Tel Service

department

CLD1.6 Cross Level drives wrong direction

YesVerify motor wire color code to P8 perPedestal Harness Schematic. Is the P8 wiredcorrectly?




Yes CLD1.5Plug spare motor (unmounted) into TB2.Does spare motor turn same direction as theinstalled motor?

No Replace motor and re-testCLD1.1

CLD1.7 +12VDC is low (< 11VDC) or missing

YesCLD1.7.1 Is the +12.0 VDC approximately half thenominal voltage? No CLD1.7.3



Yes > 11VDC Re-test CLD1.1CLD1.7.2 Re-check DC voltage from J7 and J8 pin 3 toground and pin 4 to ground. Is the +12.0 VDCOK now? No

Yes Motor short – Replace motorthen CLD1.7.2

CLD1.7.3 Disconnect P8 from TB2 and check +12VDCfrom P4 pin 4 to ground. Is the +12.0 VDCOK? No

Series 94 Troubleshooting Guide CLD


- 4-15 -

Yes TB2 short - Repair/replaceTB2, then CLD1.7.2


Yes Harness open/short –CLD1.5.1 then next

Disconnect P1 from the PCU and check theDC voltage From J1 pins 40, 41, 42, 43 and44 to ground. Is the +12.0 VDC OK? No CLD1.7.4

Yes CLD1.7.2Turn TAC-92C power OFF and reconnect P1,P7 and P8. Turn TAC-92C power ON and re-check DC voltage from J7 and J8 pin 3 toground and pin 4 to ground. Is the +12.0 VDCOK?


CLD1.7.4 Turn TAC-92C power OFF. Install the 15-PinIn-Line Test-Point connector between P2 andthe PCU. Turn TAC-92C power ON.

Yes +12VDC regulator failure -Replace PCU then CLD1.8

Check DC voltage from P2-15 to groundunder load. This may also be done byopening the backshell of P2 to access pin 15OR by opening the PCU and access on U14pin 5. Is the voltage +24VDC or greater?

No



No



Yes PCU short – replace PCU,then CLD1.8


No

Yes Spool cable – SPOOL1.0then CLD1.8

CLD1.7.5 Unplug the 9-pin Circular plug from thebracket (jack) in the base-pan of the radome.Check the DC voltage at the plug from pin 9 topin 5. Is the voltage +26VDC or greater?

No

Yes ACC1.0 then CLD1.8CLD1.7.6 Unplug P1 from the rear panel of the ACU andcheck the DC voltage from J1-9 to J1-5. Is thevoltage +26VDC or greater?

No

Yes Loss of +28VDC path –Replace Main PCB thenCLD1.8


No

YesCLD1.7.7 Turn the TAC-92C Power OFF, unplug the ACline cord from the rear panel and extract thevoltage select block. Test both fuses (250V2Amp Slow-Blow). Are BOTH fuses good?




- 4-16 -

Yes CLD1.8Re-insert the voltage select block (assure it isin the correct orientation for the AC linevoltage) and re-install the AC line cord. TurnTAC-92C power ON and test DC voltage fromMain PCB connector J5-3 to ground. Is thevoltage +28VDC restored (> +26VDC)?

No TAC1.0 then CLD1.8

Yes > 11VDC Re-test CLD1.1CLD1.8 Turn TAC-92C power OFF and reconnect allunplugged connections. Reinstall ACU &PCU covers as necessary. Turn TAC-92Cpower ON and re-check DC voltage from J7and J8 pin 3 to ground and pin 4 to ground. Isthe +12.0 VDC OK now?


Series 94 Troubleshooting Guide CLR


- 4-17 -

CLR1.0 Cross Level Rate Sensor

CLR1.1 Test for rate sensor read errors which maycause any of the following symptoms;

1. Antenna drives to either stop wheninitializing.2. Antenna does not stabilize in Cross Levelaxis properly.3. Antenna may oscillate in Cross-Level fromone end stop to the other end stop.


Fig 1 Cross-Level rate sensor andconnection.

Fig 2 Tilt sensor PCB and connections

CLR1.2 Turn TAC-92C power OFF and removeradome top (or open the radome door):


CLR1.2.1 Disconnect P1 from the PCU and visuallyinspect P1. Are any pins bent, broken orpushed into the body of the connector? No

YesCLR1.2.2 Measure continuity from the metal body of therate sensor to pedestal ground (=Open). Isthe rate sensor isolated from ground?

No CLR1.3

Yes Re-install in correctorientation

CLR1.2.3 Refer to figure 1. If the rate sensor is installedbackwards (connector forward) the antennamay oscillate from one Cross Level stop to theother. Is the rate sensor mounted in thecorrect orientation?

No

CLR1.2.4 Remove the conductive tape from the ratesensor. Save tape to reinstall later.

CLR Series 94 Troubleshooting Guide


- 4-18 -

YesRefer to figure 1. Is the IDC connection (P6)mated properly in the rate sensor? No Re-mate connection and re-

check


Yes Tighten the three Philipsscrews to secure themounting plate to thepedestal and re-check.

CLR1.2.5 The rate sensor must be firmly mounted to thepedestal. Grip the body of the rate sensorwith thumb and forefinger of one hand whileholding the level cage firmly in the other hand.Gently wiggle the rate sensor. Is themounting plate loose on the pedestal?

No

YesCLR1.2.6 The rate sensor must be firmly mounted to its’mounting plate. Grip the body of the ratesensor with thumb and forefinger of one handwhile holding the pedestal firmly in the otherhand. Gently wiggle the rate sensor. Is therate sensor loose on the mounting plate?

No CLR1.5


Remove the three Phillips screws that attachthe mounting plate to the pedestal, tighten therate sensor mounting screws and re-check. Isthe rate sensor still loose on the mountingplate?

No Re-install the mounting plate(and rate sensor) on thepedestal and re-checkCLR1.2.5

Yes Remove the PCB, trim leadsor replace spacers and re-install. The tilt sensor may bedamaged TILT1.0

CLR1.2.7 Refer to figure 2. Inspect the tilt sensor PCBto assure that the leads on the under-side ofthe PCB are not shorted to the level cageenclosure (there should be three plasticspacers between the PCB and the aluminum).Are any leads shorted?

No

YesRefer to figure 2. Inspect the two 5-pin IDCconnectors (P16 has three wires and P15 hasfive wires as shown in figure 2). Assure theyare plugged in correctly (correct orientationwith no gap between them and no exposedpins on the header). Are the connectorsplugged in correctly?


Yes Repair and re-checkAre any wires in the IDC connectors (P15 &P16) broken or frayed?

No

CLR1.3 Rate sensor isolation


No Tape was shorting – re-checkCLR1.2.2

Yes CLR1.4.1, then re-checkCLR1.2.2

Remove the three Philips screws to detachthe mounting plate (and rate sensor) from thepedestal. Is the rate sensor still shorted topedestal ground?



Tighten the rate sensor mounting screws andre-check. Is the rate sensor still loose on themounting plate? No Re-check CLR1.2.2

Series 94 Troubleshooting Guide CLR


- 4-19 -

CLR1.4 Harness continuity

YesCLR1.4.1 Disconnect P1 & P6 and check continuityfrom:

P6-1 to P1-5 = ShortP6-4 to P1-8 = ShortP6-5 to P1-44 = Short (through TB1)

Is continuity good?




P6-5 to ground = OpenP6-1 to P6-4 = OpenP6-1 to P6-5 = Open


No

Yes CLR1.1CLR1.4.2 Were repairs made to the harness in theprevious three steps? No

CLR1.5 Nominal output voltage

Reconnect P1 and P6. Turn TAC-92C powerON

Assure that the boat is not moving at the pier.The pedestal is not to be rotated (tilted left-right) while monitoring the rate sensor outputvoltage (rate sensor not being rotated in freespace).

YesMonitor the rate sensor output DC voltagefrom P6 pin 4 to ground. Nominal when therate sensor is not being rotated is 2.50VDC+/-100MV. Is the voltage OK?

No CLR1.7

CLR1.6 Output voltage varies with motion

Yes CLR1.8Loosen the three Philips screws securing therate sensor mounting plate, grip the ratesensor with your finger and thumb and gently“wiggle” (rotate up/down) the rate sensorwhile continuing to monitor the output voltage.CW (DOWN) rotation should cause the outputto increase above 2.50VDC and CCW (UP)rotation causes the voltage to decrease below2.50 VDC. The amount of increase, ordecrease, from nominal is proportional to therate of rotation. Does the output vary as therate sensor is rotated?

No Replace rate sensor and re-check

Yes Replace rate sensor and re-check CLR1.5

CLR1.7 Measure the DC voltage from P6 pin 5 toground (metal body). Is the 12 VDC OK?

No

CLR Series 94 Troubleshooting Guide


- 4-20 -

Yes CLR1.4.1, then re-checkCLR1.5


CLR1.5

Yes CLR1.9CLR1.8 Re-connect P1 and turn TAC-92C ON. Gripthe rate sensor with your finger and thumband gently rotate (up/down) the rate sensor.Does Cross-Level drive the pedestal inresponse to rotation of the rate sensor?

No CLR1.4.1, then next

Yes Re-check CLR1.5Were repairs made during the harnesscontinuity checks? No Replace PCU and re-check

CLR1.8

YesCLR1.9 Turn TAC-92C OFF. Tighten the three Philipsscrews to secure the rate sensor mountingplate to the pedestal. Re-install theconductive tape over the rate sensor IDCconnection. Assure that the tape does notshort any of the wires in the IDC connectorand does not short the body of the rate sensorto the pedestal ground or the harnessshield/braid. Re check CLR1.3. Is the ratesensor isolated from ground?



Return

Series 94 Troubleshooting Guide COMP


- 4-21 -

COMP1.0 Remote Compensation Failure

Access “Remote Comp” selection of theremote parameters of the TAC-92C.

Press UP arrow key, then the ENTER key.Display will read “Please Wait”

Compensation will take about two minutes.During this time the antenna will measure themagnetic deviation while slowly rotating inazimuth. When finished the results will bedisplayed.

YesCOMP1.1 Does the display read “Comp Complete”?

No COMP1.2

Press MODE twice to display “RemoteParameters”. Press the UP arrow key thenpress the ENTER key to save thecompensation values to NVRAM in the PCU.

Return

Yes FLUX1.0, if FLUX has beenfollowed and the errorpersists then COMP1.2.1

COMP1.2 Does the display read “Comp Range Error“?

No COMP1.3

Yes COMP1.4COMP1.2.1 This error may be due to excessive magneticdisturbances. Is the antenna within 6 feet oflarge metal masses or magnetic fields fromspeakers or large Radar motors?

No

Yes COMP1.5Is the boat steel hull/super-structure?


YesCOMP1.3 Does the display read “Comp Gain Error”?

No COMP1.0

Yes COMP1.5There may not be sufficient magnetic fieldintensity for the Fluxgate to read (common inNorthern latitudes). Use FLUX to rule outequipment failure and re-compensate. Doesthe error persist?

No COMP1.1

Yes Relocate then COMP1.0COMP1.4 Can the antenna be re-located farther awayfrom the magnetic disturbances? No COMP1.5

COMP1.5 Interface TAC-92C to a Ships Gyrocompass(SBS or Synchro) or an External Fluxgate(Ritchie DH-200 or KVH Autocomp 1000)

Return

ELD Series 94 Troubleshooting Guide


- 4-22 -

ELD1.0 Elevation Drive problems


YesELD1.1 Does the level cage drive properly?

No LEV1.0

Yes Return

Yes, Elevationdrives but notconsistently

ELD1.3

No, Elevationdrives thewrongdirection.

ELD1.7

ELD1.2 Test Elevation drive to determine the nature ofthe drive problem. Turn the TAC-92C powerON, turn tracking OFF (press AUX1).Observe level cage & elevation drive while theantenna is initializing, or while stepping,slewing or targeting azimuth. Does theantenna drive properly in elevation?

No Elevationdrive.

ELD1.3

ELD1.3 No Elevation drive or drive is notconsistent




No

YesRotate the pedestal through 90-degree rangeof Elevation motion. The antenna shouldrotate freely and easily with light fingerpressure. Do the Elevation bearings rotatefreely with no binding in Elevation?


Yes Re-route or tie cables on thepedestal and re-check.

Assure that the cables on the pedestal are notrestricting or binding the free rotation of thepedestal. Is there cable restriction noted? No


Check the Elevation drive belt. Is the beltbroken or loose?

No

YesIs the 44-pin connector (P1) properly mated tothe PCU? No Re-mate connection and re-

check.


No Re-mate connection and re-check.

Yes Repair and re-check.Are the wires in the IDC connectors (J10 &J11) broken or frayed? No

Series 94 Troubleshooting Guide ELD


- 4-23 -


ELD1.4 +12VDC test

Yes > 11VDC

No, voltage islow (< 11VDC)or missing

ELD1.8

Check the DC Voltage on J10 and J11, frompin 3 to ground and pin 4 to ground. Is the+12.0 VDC OK?



ELD1.5 Motor (M3) Continuity

YesDisconnect P11 and check continuity of themotor windings, measure from:P11-1 to P11-3 or 4 ~25Ù

P11-2 to P11-3 or 4 ~25ÙP11-5 to P11-3 or 4 ~25Ù



No Motor open - Replace motorand re-check.






No ELD1.6

Yes ReturnReconnect P11 and re-test elevation drive. IsElevation drive restored? No ELD1.6

ELD1.6 Harness Continuity

ELD1.6.1 Turn TAC-92C power OFF.






No Repair harness and re-check.



- 4-24 -









No

Yes ELD1.1ELD1.6.2 Were repairs made to the harness in theprevious three steps?

No

Yes ReturnReplace PCU (failed drivers), re-connect allcables and turn TAC-92C power ON. IsAzimuth drive restored? No Contact Sea Tel Service

department Sea Tel Servicedepartment

ELD1.7 Elevation drives wrong direction

YesVerify motor wire color code to P11. Is theP11 wired correctly? No Replace motor and re-check.


correct version and re-test

Yes ELD1.6Plug spare motor (unmounted) into TB3.Does spare motor turn same direction as theinstalled motor?

No Replace motor and re-testELD1.2

ELD1.8 +12VDC is low (~ 6-10VDC) or missing

YesELD1.8.1 Is the +12.0 VDC approximately half thenominal voltage? No ELD1.8.3



Yes > 11VDC Re-test ELD1.8ELD1.8.2 Re-check DC voltage from J10 and J11 pin 3to ground and pin 4 to ground. Is the +12.0VDC OK now? No

Yes Motor short – Replace motorthen ELD1.8.2

ELD1.8.3 Disconnect P11 from TB3 and check +12VDCfrom P10 pin 4 to ground. Is the +12.0 VDCOK? No

Series 94 Troubleshooting Guide ELD


- 4-25 -

Yes TB3 short - Repair/replaceTB3, then ELD1.8.2


Yes Harness open/short –ELD1.5.1 then next

Disconnect P1 from the PCU and check theDC voltage From J1 pins 40, 41, 42, 43 and44 to ground. Is the +12.0 VDC OK? No ELD1.8.4

Yes ELD1.8.2Turn TAC-92C power OFF and reconnect P1,P10 and P11. Turn TAC-92C power ON andre-check DC voltage from J10 and J11 pin 3to ground and pin 4 to ground. Is the +12.0VDC OK?


ELD1.8.4 Turn TAC-92C power OFF. Install the 15-PinIn-Line Test-Point connector between P2 andthe PCU. Turn TAC-92C power ON.

Yes +12VDC regulator failure -Replace PCU then ELD1.9

Check DC voltage from P2-15 to groundunder load. This may also be done byopening the backshell of P2 to access pin 15OR by opening the PCU and access on U14pin 5. Is the voltage +24VDC or greater?

No



No



Yes PCU short – replace PCU,then ELD1.9


No

Yes Spool cable – SPOOL1.0then ELD1.9

ELD1.8.5 Unplug the 9-pin Circular plug from thebracket (jack) in the base-pan of the radome.Check the DC voltage at the plug from pin 9 topin 5. Is the voltage +26VDC or greater?

No

Yes ACC1.0 then ELD1.9ELD1.8.6 Unplug P1 from the rear panel of the ACU andcheck the DC voltage from J1-9 to J1-5. Is thevoltage +26VDC or greater?

No

Yes Loss of +28VDC path –Replace Main PCB thenELD1.9


No

YesELD1.8.7 Turn the TAC-92C Power OFF, unplug the ACline cord from the rear panel and extract thevoltage select block. Test both fuses (250V2Amp Slow-Blow). Are BOTH fuses good?




- 4-26 -

Yes ELD1.9Re-insert the voltage select block (assure it isin the correct orientation for the AC linevoltage) and re-install the AC line cord. TurnTAC-92C power ON and test DC voltage fromMain PCB connector J5-3 to ground. Is thevoltage +28VDC restored (> +26VDC)?

No TAC1.0 then ELD1.9

Yes > 11VDC Re-test ELD1.2ELD1.9 Turn TAC-92C power OFF and reconnect allunplugged connections. Reinstall ACU &PCU covers as necessary. Turn TAC-92Cpower ON and re-check DC voltage from J10and J11 pin 3 to ground and pin 4 to ground.Is the +12.0 VDC OK now?


Series 94 Troubleshooting Guide ELR


- 4-27 -

ELR1.0 Elevation Rate Sensor

ELR1.1 Test for rate sensor read errors which maycause any of the following symptoms;

1. Antenna drives to either stop after a briefstop at the correct Elevation when initializing.2. Antenna does not stabilize in Level(Elevation) axis properly.3. Antenna may oscillate in Elevation from theupper end stop to the lower end stop.


Fig 1 Elevation rate sensor and connection.

Fig 2 Tilt sensor PCB and connections

ELR1.2 Turn TAC-92C power OFF and removeradome top (or open the radome door):


ELR1.2.1 Disconnect P1 from the PCU and visuallyinspect P1. Are any pins bent, broken orpushed into the body of the connector? No

YesELR1.2.2 Measure continuity from the metal body of therate sensor to pedestal ground (=Open). Isthe rate sensor isolated from ground?

No ELR1.3

ELR Series 94 Troubleshooting Guide


- 4-28 -

Yes Re-install in correctorientation

ELR1.2.3 Refer to figure 1. If the rate sensor is installedbackwards (connector toward the right end ofthe level beam), the antenna may oscillatefrom one Elevation stop to the other. On the2494 (only) pedestal the rate sensor ismounted on the Cross-Level driven sprocket,all other models are as shown below. Is therate sensor mounted in the correctorientation?

No

ELR1.2.4 Remove the conductive tape from the ratesensor. Save tape to reinstall later.

YesRefer to figure 1. Is the IDC connection (P9)mated properly in the rate sensor? No Re-mate connection and re-

check


Yes Tighten the three Philipsscrews to secure themounting plate to the levelbeam and re-check.

ELR1.2.5 The rate sensor must be firmly mounted to thelevel beam. Grip the body of the rate sensorwith thumb and forefinger of one hand whileholding the level beam firmly in the otherhand. Gently wiggle the rate sensor. Is themounting plate loose on the level beam?

No

YesELR1.2.6 The rate sensor must be firmly mounted to its’mounting plate. Grip the body of the ratesensor with thumb and forefinger of one handwhile holding the level beam firmly in the otherhand. Gently wiggle the rate sensor. Is therate sensor loose on the mounting plate?

No ELR1.5


Remove the three Phillips screws that attachthe mounting plate to the level beam tightenthe rate sensor mounting screws and re-check. Is the rate sensor still loose on themounting plate?

No Re-install the mounting plate(and rate sensor) on the levelbeam and re-check ELR1.2.5


ELR1.2.7 Refer to figure 2. Inspect the tilt sensor PCBto assure that the leads on the under-side ofthe PCB are not shorted to the level cageenclosure (there should be two plasticspacers between the PCB and the aluminum).Are any leads shorted?

No

YesRefer to figure 2. Inspect the two 5-pin IDCconnectors (P16 has three wires and P15 hasfive wires as shown in figure 2). Assure theyare plugged in correctly (correct orientationwith no gap between them and no exposedpins on the header). Are the connectorsplugged in correctly?


Yes Repair and re-checkAre any wires in the IDC connectors (P15 &P16) broken or frayed? No

Series 94 Troubleshooting Guide ELR


- 4-29 -

ELR1.3 Rate sensor isolation


No Tape was shorting – re-checkELR1.2.2

Yes ELR1.4.1, then re-checkELR1.2.2

Remove the three Philips screws to detachthe mounting plate (and rate sensor) from thelevel beam. Is the rate sensor still shorted topedestal ground?



Tighten the rate sensor mounting screws andre-check. Is the rate sensor still loose on themounting plate? No Re-check ELR1.2.2

ELR1.4 Harness continuity

YesELR1.4.1 Disconnect P1 & P9 and check continuityfrom:

P9-1 to P1-35 = ShortP9-4 to P1-3 = ShortP9-5 to P1-43 = Short (through TB2)

Is continuity good?




P9-5 to ground = OpenP9-1 to P9-4 = OpenP9-1 to P9-5 = Open


No

Yes ELR1.1ELR1.4.2 Were repairs made to the harness in theprevious three steps? No

ELR1.5 Nominal output voltage

Reconnect P1 and P9. Turn TAC-92C powerON

Assure that the boat is not moving at the pier.The pedestal is not to be rotated (tilted left-right) while monitoring the rate sensor outputvoltage (rate sensor not being rotated in freespace).

YesMonitor the rate sensor output DC voltagefrom P9 pin 4 to ground. Nominal when therate sensor is not being rotated is 2.50VDC+/-100MV. Is the voltage OK?

No ELR1.7

ELR Series 94 Troubleshooting Guide


- 4-30 -

ELR1.6 Output voltage varies with motion

Yes ELR1.8Loosen the three Philips screws securing therate sensor mounting plate, grip the ratesensor with your finger and thumb and gently“wiggle” (rotate fore/aft) the rate sensor whilecontinuing to monitor the output voltage. CW(Backward) rotation should cause the outputto increase above 2.50VDC and CCW(Forward) rotation causes the voltage todecrease below 2.50 VDC. The amount ofincrease, or decrease, from nominal isproportional to the rate of rotation. Does theoutput vary as the rate sensor is rotated?

No Replace rate sensor and re-check

Yes Replace rate sensor and re-check ELR1.5

ELR1.7 Measure the DC voltage from P9 pin 5 toground (metal body). Is the 12 VDC OK?

No

Yes ELR1.4.1, then re-checkELR1.5


ELR1.5

Yes ELR1.9ELR1.8 Re-connect P1 and turn TAC-92C ON. Gripthe rate sensor with your finger and thumband gently rotate (fore/aft) the rate sensor.Does Elevation drive the pedestal in responseto rotation of the rate sensor?

No ELR1.4.1, then next

Yes Re-check ELR1.5Were repairs made during the harnesscontinuity checks? No Replace PCU and re-check

ELR1.8

YesELR1.9 Turn TAC-92C OFF. Tighten the three Philipsscrews to secure the rate sensor mountingplate to the pedestal. Re-install theconductive tape over the rate sensor IDCconnection. Assure that the tape does notshort any of the wires in the IDC connectorand does not short the body of the rate sensorto the pedestal ground or the harnessshield/braid. Re check ELR1.3. Is the ratesensor isolated from ground?



Return

Series 94 Troubleshooting Guide ENC


- 4-31 -

ENC1.0 Encoder failure

Common failures are;

1. Frequently/Constantly lit unwrap LED onthe TAC-92C.2. Pedestal won’t drive to the CW stop duringinitialization. OR Pedestal drives to the CCWstop after initialization.

ENC1.1 Test – Best test is to observe initialization ofthe antenna (azimuth phase). Afterinitialization of the antenna the unwrap LEDshould not be frequently, or constantly, lit andthe TAC-92C display of the relative position ofthe antenna should readout from 095 (whereCCW unwrap should occur) to 625 (whereCW unwrap should occur).

ENC1.2 Turn TAC-92C power OFF and disconnectencoder connector (P3). Check pins forcorrosion or residue. Clean pins as neededand re-connect.

Yes ENC1.3ENC1.2.1 Rotate the pedestal and verify that the shaft ofthe encoder turns freely. Does the encodershaft turn smoothly?

No

Yes Reposition encoder for properbelt tension

Check belt tension to the encoder sprocket.When the pedestal is rotated the belt shouldnot slip on the sprocket. Does the belt slip onthe encoder sprocket?

No

YesAdjust mounting position of the encoder awayfrom the belt. Rotate the shaft of the encoder.Does the shaft turn freely?

No ENC1.7

Yes Tighten set screw in thesprocket and re-test

Check sprocket on shaft of the encoder. Isthe sprocket slipping on the shaft of theencoder? No

Reposition encoder for proper belt tensionand re-test ENC1.2.1

YesENC1.3 Turn TAC-92C power ON. Turn tracking OFF.Disconnect P5 from TB1 to disable azimuthdrive. Measure DC voltage from P3 (blue IDCat encoder) pin 2 to ground. Is the 5 VDCOK?

No ENC1.6

YesENC1.4 Monitor DC voltage from P3 pin 1 to groundwhile slowly rotating the antenna CW or CCWin azimuth. Voltage should step from 0.0-5.0VDC. Does voltage step OK?

No ENC1.7

YesENC1.5 Monitor DC voltage from P3 pin 3 to groundwhile slowly rotating the antenna CW or CCWin azimuth. Voltage should step from 0.0-5.0VDC. Does voltage step OK?

No ENC1.7

Reconnect P5 (azimuth drive).

ENC Series 94 Troubleshooting Guide


- 4-32 -

ENC1.6 Turn TAC-92C power OFF. Disconnect P3from the encoder and P1 from the PCU.

Yes Repair, and re-test harnessCheck continuity:

From P3-1 to P1-33 ~ ShortFrom P3-2 to P1-16, 17 & 31 ~ ShortFrom P3-3 to P1-32 ~ Short

From P3-5 to P1-37 ~ ShortAre any open lines?

No

Yes Repair, and re-test harnessCheck continuity:From P3-1 to P3-2 ~ Open

From P3-1 to P3-3 ~ OpenFrom P3-1 to P3-5 ~ OpenFrom P3-2 to P3-3~ Open

From P3-2 to P3-5 ~ OpenFrom P3-3 to P3-5 ~ Open

Are there any shorted lines?

No Replace PCU and re-test

Yes Contact Sea Tel Servicedepartment Sea Tel Servicedepartment

ENC1.7 Antennas shipped after January 1997 do NOThave encoders. These (current) antennaskeep track of the relative position of theantenna by counting steps issued to theazimuth motor. When the encoder in an oldersystem fails Sea Tel recommends installationof new PCU to convert to “encoder-less”operation rather than replacing the encoder.Is “encoder-less” operation desired?

No Replace encoder and re-test

Series 94 Troubleshooting Guide ERR


- 4-33 -

ERR1.0 Error Codes

When the TAC-92C Error LED is lit, pressmode to access the numeric value of the errorin the error code display. The error codedisplay is comprised of two values LLLL andRRRR, where LLLL is a communicationscounter that is not used in these systems andthe RRRR display is the value of the systemerror(s). The error code display does NOTrepresent multiple occurrences of the sameerror (0003 is NOT three 0001s). Thenumeric value displayed is the SUM of theindividual (different) errors that have occurred(0003 = error 0001 plus error 0002).

Note the error code value and determinewhich error(s) it represents. To clear theerror(s), press the UP arrow key while in theerror code display mode, or press the RESETkey. Errors should be noted, cleared and thesystem monitored for frequency of re-occurrence.

A frequent (or constant) error is an indicationof a system failure. Troubleshoot each errorindividually.

ERR1.1 Error code 0001 – Gyro read error. ERR2.0

ERR1.2 Error code 0002 – Wrong SynchroConverter Type error.

ERR3.0

ERR1.3 Error code 0004 – Communications (ACU-PCU) error.

ERR4.0

ERR1.4 Error code 0008 – Reserved ERR5.0

ERR1.5 Error code 0016 – Conscan error. ERR6.0

ERR1.6 Error code 0032 – Reserved. ERR7.0

ERR1.7 Error code 0064 - Reserved. ERR8.0

ERR1.8 Error code 0128 – Satellite out of rangeerror.

ERR9.0

ERR Series 94 Troubleshooting Guide


- 4-34 -

ERR2.0 Error Code 0001 – Gyro Read Error

YesERR2.1 Clear this error and monitor the system for re-occurrence. Does this error re-occur? No Return

ERR2.2 Type of Ships Gyrocompass output

Verify the type of Gyrocompass signal that isbeing used as the “Ships Heading” input tothe TAC-92C

Yes ERR2.3Is NMEA 0183 Heading input being used?

No

Yes ERR2.4Is Step-By-Step (SBS) Heading input beingused? No

Yes ERR2.5Is Synchro Heading input being used?

No

Set Gyro Type parameter to 0000.

Press MODE repeatedly until “SaveParameters” is selected. Press the UP arrow,then press ENTER to save the new System &Gyro Type parameter values.

ERR2.1

ERR2.3 NMEA Heading Gyrocompass/ExternalFluxgate input

RS-422 ASCII Data wired to J13 ASPA porton the rear of the TAC-92C. The ASCII Datainput string must contain standard HDM orHDT ID text strings.

YesERR2.3.1 Is the TAC-92C Software version 2.53 orhigher? No Contact Sea Tel Service

department

YesIs the Pedestal Software the following versionor higher; 4894 ver 1.32, 4094 ver 1.32,3294 ver 1.32, 2494 DBS ver 2.51 or 2094ver 1.06. Is the pedestal software correct?


Assure that the System Type parameter value(sum of desired features) includes 8 feature toenable communications between the ASPAPCBs and the Main PCB. The most commonentries are 8, 12, 72 or 76.

If TAC-92C software is version 2.76 or lowerset Gyro Type parameter = 0000. If TAC-92Csoftware is version 2.77 or higher set GyroType parameter = 0002.

Press MODE repeatedly until “SaveParameters” is selected. Press the UP arrow,then press ENTER to save the new System &Gyro Type parameter values.

YesRemove top of TAC-92C. ASPA port softwareversion NMEAH ver 1.04 or greater? No Contact Sea Tel Service

department



- 4-35 -

Yes ERR2.3.4ERR2.3.2 Verify that the RS-422 Data is getting to theTerminal Mounting Strip connections to theTAC-92C ASPA PCB (may require anOscilloscope). Is the Data input OK?

No

Yes Repair wiring to the ACU re-test ERR2.1

ERR2.3.3 Verify the RS-422 Data at the Gyrocompassoutput. Is the Data output OK at theGyrocompass? No

YesCheck output fuse/switch for the output line.Is the fuse/switch OK? No Replace fuse/turn switch ON

and re-test ERR2.1

Repair the Gyrocompass and re-testERR2.3.2.

YesERR2.3.4 Observe NMEA LED on the ASPA PCB thatthe Gyrocompass input is connected to. Isthe NMEA LED rapidly flashing?

No Replace ASPA PCB and re-check

Yes ERR2.1Is the Ships Heading display correct?

No Replace Main PCB and re-check

ERR2.4 SBS Gyrocompass input (6 step/degree)

Figure 1 SBS Gyrocompass Output

Refer to figure 1 (above). DC voltagesignaling of A, B and C phases to COMstepping in sequence noted above. This inputis wired to Terminal Mounting Strip COM, A, Band C terminals and connected, via ribboncable, to J2 port on the rear of the TAC-92C.The most common voltage levels are +/-35 or+/-70 VDC, however, check the manual forthe Gyrocompass to ascertain its’ correctrated level of the output voltage. The opto-isolated inputs on the Main PCB will not readproperly below about 20VDC.



- 4-36 -

The most common causes of this error are;

1. Noise on the line(s), that periodicallymakes all three lines appear to be highwhen only two are actually high.

2. Loss of voltage on the lines, making allthree lines go low.

Yes ERR2.4.2ERR2.4.1 Correct Gyro Type parameter setting is 0002.Is Gyro Type set correctly? No

Set Gyro Type parameter = 0002.

Press MODE repeatedly until “SaveParameters” is selected. Press the UP arrow,then press ENTER to save the new GyroType.

Press SHIP repeatedly to select ShipsHeading entry, enter the correct heading ofthe Gyrocompass.

ERR2.1

YesERR2.4.2 At the Terminal Mounting Strip, measure theDC voltage level from COM to ground. Thislevel should be either 0VDC or the ratedvoltage of the Gyrocompass output (positiveor negative voltage). Is the voltage levelcorrect?

No Verify wiring connectionsfrom Terminal Mounting Stripto the Gyrocompass outputterminals.

Yes Incorrect wiring connectionsto the Gyrocompass outputterminals.

Monitor the DC voltage level from COM toground. This voltage level should not changeas the boat turns. Does the voltage level varyas the boat turns? No

ERR2.4.3 Phase voltage levels should switch from highstate to low state as the boat turns. The highstate voltage may be positive or negative(rated voltage level of the Gyrocompassoutput) and the low state level should beapproximately 0VDC.

YesMonitor the DC voltage level from COM to A.Is the high state voltage level correct? No ERR2.4.4

YesVerify phase voltage does switch as the boatturns. Does the phase voltage switch to low? No ERR2.4.4

YesIs the low state voltage approximately 0VDC?

No ERR2.4.4

YesMonitor the DC voltage level from COM to B.Is the high state voltage level correct? No ERR2.4.4


YesIs the low state voltage approximately 0VDC?

No ERR2.4.4

YesMonitor the DC voltage level from COM to C.Is the high state voltage level correct? No ERR2.4.4



- 4-37 -


Yes ERR2.4.5Is the low state voltage approximately 0VDC?

No ERR2.4.4

Yes Replace Main PCB, verify allparameters, then ERR2.1

ERR2.4.4 Disconnect ribbon cable from the ACU and re-test 2.4.3. Are the phase voltage levels andswitching correct with the ACU disconnected? No

YesAt the Gyrocompass distribution box, checkoutput fuse/switch. Is the fuse/switch OK? No Replace fuse/turn switch ON

then next

Yes Reconnect all connectionsand re-test ERR2.1

Check output terminals in the distribution boxterminals. Are the phase voltage levels andswitching correct? No Repair Gyrocompass and re-

check

Yes Repair Gyrocompass and re-test ERR2.1

ERR2.4.5 Monitor the A, B & C Phase lines with anoscilloscope. Are there voltage spikes ornoise on any of the lines? No

Yes Replace Main PCB, verify allparameters, then ERR2.1

Monitor voltage inputs to the opto-isolatorscircuits on the main PCB. R7 is A phase, R5is B phase and R3 is C phase. Are the phasevoltage levels and switching correct?

No Repair/replace ribbon cableand re-test ERR2.1

ERR2.5 Synchro Gyrocompass input

Figure 2 Synchro Gyrocompass output

Refer to Figure 2 (above) showing the ACvoltage signaling of S1, S2 and S3 phases.This input is wired to the Terminal MountingStrip R1, R2, S1, S2 and S3 terminals andconnected, via ribbon cable, to J2 port on therear of the TAC-92C. Valid Synchro inputratios are 1:1, 36:1, 90:1 or 360:1, butacceptable ratio(s) is dependant upon whichSynchro Converter PCB is installed inside theTAC-92C.

YesIs the Gyrocompass output Synchro 1:1, 36:1,90:1 or 360:1? No Other ratios are not available.



- 4-38 -

Yes ERR2.5.2ERR2.5.1 Open the top cover of the TAC-92C and verifythe type of synchro converter installed on theMain PCB. The synchro converter (daughterboard) is plugged into the two 20-pin headerstrips on the left side of the main PCB, nearthe rear, partially under the ASPA boards. Isa synchro converter installed?

No Contact Sea Tel Servicedepartment Sea Tel sales toprocure an appropriateSynchro Converter PCB toinstall.

Figure 3 360:1 to SBS Converter

YesERR2.5.2 Is the PN 112790 360:1-To-SBS SynchroConverter PCB (Figure 3 above) installed? No ERR2.5.3

Yes ERR2.5.4Is the Gyrocompass output 1:1 Synchro?

No


No


No

Yes Set Gyro Type parameter to0360, then ERR2.5.5

Is the Gyrocompass output 360:1 Synchro?

No ERR2.2

Figure 4 12-Bit S/D Converter

YesERR2.5.3 Is the PN 114836 12-Bit S/D Synchro toDigital Converter PCB (Figure 4 above)installed?

No ERR2.5.1



- 4-39 -



No



No



No



No ERR2.2

ERR2.5.4 Contact Sea Tel Service department Sea Telsales dept to procure a 12-bit S/D Synchro toDigital Converter PCB (PN 114836) to install.

ERR2.5.5 Press MODE repeatedly until “SaveParameters” is selected. Press the UP arrow,then press ENTER to save the new GyroType.

YesSet heading …Clear the error and monitor thesystem for re-occurrence. Does the error0001 re-occur?

No Return

ERR2.6 Synchro Rotor AC Voltage

The most common rotor voltage is 110 VAC,however some newer Gyrocompasses use 55VAC output. Refer to the manual for theGyrocompass to ascertain its proper outputvoltage level. This AC voltage should NOTvary as the boat turns.

YesMeasure the AC Voltage from R1 to R2 on theTerminal Mounting Strip. Is the AC voltagelevel correct?

No ERR2.9

Yes Wiring to Gyrocompass isincorrect, correct wiring thenre-check.

Monitor the AC Voltage from R1 to R2 as theboat turns. Does the AC voltage level vary?

No ERR2.8

ERR2.8 Synchro Stator AC Voltages

The most common stator voltage is 0-90 VAC,however some newer Gyrocompasses have0-36 VAC outputs. Refer to the manual forthe Gyrocompass to ascertain its properoutput voltage level. The stator voltagesshould vary from 0VAC to Peak VAC as theboat turns.

YesERR2.8.1 Monitor the AC Voltage from S1 to S2 on theTerminal Mounting Strip. Does the ACvoltage vary properly from 0-Peak?

No ERR2.9



- 4-40 -

YesIs the “Peak” AC voltage level correct?

No ERR2.9


No ERR2.9


No ERR2.9


No ERR2.9


No ERR2.9

Yes Replace Synchro ConverterPCB and re-check. If stillYes, replace Main PCB, verifyall parameters, then ERR2.1

ERR2.9 Disconnect ribbon cable from the ACU and re-test 2.4.3. Are the Peak voltage levels andvariations correct with the ACU disconnected?

No

YesAt the Gyrocompass distribution box, checkoutput fuse/switch. Is the fuse/switch OK? No Replace fuse/turn switch ON

then next

Yes Reconnect all connectionsand re-test ERR2.1

Check output terminals in the distribution boxterminals. Are the Peak voltage levels andvariations correct at the Gyrocompass? No Repair Gyrocompass and re-

check



- 4-41 -

ERR3.0 Error Code 0002 – Wrong SynchroConverter Type

This error occurs when the “Gyro Type”parameter is set to an incorrect value for theSynchro Converter (daughter board) which isinstalled on the TAC-92C Main PCB.

Yes ERR3.3ERR3.1 Is a ships Gyrocompass being used forheading input to the TAC-92C? No ERR3.2

ERR3.2 Fluxgate inputs

Yes Set Gyro Type parameter to0000, then ERR3.8

ERR3.2.1 Is the internal fluxgate (mounted on theantenna pedestal) being used for headinginput to the TAC-92C? No

YesERR3.2.2 Is an external fluxgate device being used forheading input to the TAC-92C? No ERR3.1


Check the version of the TAC-92C softwarebeing used. Is the TAC-92C software version2.77 or greater? No Set Gyro Type parameter to

0000, then ERR3.8

ERR3.3 Verify the type of output from the ShipsGyrocompass.

YesIs the Gyrocompass output NMEA-0183Heading? No ERR3.3.1


Check the version of the TAC-92C softwarebeing used. Is the TAC-92C software version2.77 or greater? No Set Gyro Type parameter to

0000, then ERR3.8


ERR3.3.1 Is the Gyrocompass output Step-By-Step?

No

Yes ERR3.4Is the Gyrocompass output Synchro (1:1,36:1, 90:1 or 360:1)? No ERR3.3

Yes ERR3.5ERR3.4 Open the top cover of the TAC-92C and verifythe type of synchro converter installed on theMain PCB. The synchro converter (daughterboard) is plugged into the two 20-pin headerstrips on the left side of the main PCB, nearthe rear, partially under the ASPA boards. Isa synchro converter installed?

No Contact Sea Tel salesdepartment to procure anappropriate SynchroConverter PCB to install.



- 4-42 -

ERR3.5

YesIs the PN 112790 360:1-To-SBS SynchroConverter PCB (shown above) installed? No ERR3.6

Yes ERR3.7Is the Gyrocompass output 1:1 Synchro?

No


No


No



No ERR3.3

ERR3.6

YesIs the PN 114836 12-Bit S/D Synchro toDigital Converter PCB (shown above)installed?

No ERR3.4



No



No



No



- 4-43 -



No ERR3.3

ERR3.7 Contact Sea Tel Service department Sea Telsales dept to procure a 12-bit S/D Synchro toDigital Converter PCB (PN 114836) to install.

ERR3.8 Press MODE repeatedly until “SaveParameters” is selected. Press the UP arrow,then press ENTER to save the new GyroType.

Yes ERR3.1Clear the error and monitor the system for re-occurrence. Does the error 0002 re-occur? No Return



- 4-44 -

ERR4.0 Error Code 0004 –Communications error

This error indicates an RS422communications error between the TAC-92CAntenna Control Unit and the AntennaPedestal Control Unit.

This error will be indicated when the power-updisplay of the TAC-92C reports “Remote NotResponding”.

Refer to the Antenna Control Cable andAntenna System Schematic drawings for allvoltage and continuity testing.

YesERR4.1 Clear this error and monitor the system for re-occurrence. Does this error code and RemoteNot Responding re-occur?

No Return

ERR4.2 Check to assure that the antenna controlcable connections are properly connected.Visually inspect each connection. Caution:Prior to re-seating any of the connectionsturn TAC-92C power OFF, re-seat theconnection and then turn power back ON.

YesIs the antenna control cable plugged into J1on the rear panel of the TAC-92C properly? No Caution re-seat connection

YesIs the antenna control cable plugged into the9-pin circular jack on the bracket mountedinside the base-pan of the radome?

No Caution re-seat connection

YesIs the antenna control cable connection (P2)plugged into J2 on the PCU? No Caution re-seat connection

YesWere any connections loose in the previousthree steps? No ERR4.3

Yes ERR4.3Clear this error and monitor the system for re-occurrence. Does this error code and RemoteNot Responding re-occur?

No Return

ERR4.3 DC voltage checks

Yes ERR4.4Open the back-shell of P2 and check DCvoltage from P2-15 to ground under load. Isthe +24VDC OK?

No

Yes Pol/Feed short – isolate,repair and re-check ERR4.3

Monitor the voltage from P2-15 to ground andunplug P1 from the Pol Aux Relay PCB. Isthe P2-15 +24VDC OK? No

Yes Pedestal short – isolate,repair, and re-test ERR4.3

Monitor the voltage from P2-15 to ground andunplug P1 from PCU. Is the P2-15 +24VDCOK? No

Yes PCU short – isolate, repair,and re-test ERR4.3

Monitor the voltage from P2-15 to ground andunplug P2 from PCU. Is the P2-15 +24VDCOK? No



- 4-45 -

Yes Spool cable – SPOOL1.0then re-test ERR4.3

Unplug the 9-pin Circular plug from thebracket in the base-pan of the radome.Check the DC voltage from pin 9 to pin 5. Isthe +24VDC OK?

No

Yes ACC1.0 then re-test ERR4.3Unplug P1 from the rear panel of the ACU andcheck the DC voltage from J1-9 to J1-5. Isthe +24VDC OK?

No

YesTurn TAC-92C power OFF and reconnect allunplugged connections. Turn TAC-92Cpower ON and re-test 1.3. Is the +24VDCRestored?

No TAC1.0

Yes ERR4.4Clear this error and monitor the system for re-occurrence. Does this error code and RemoteNot Responding re-occur?

No Return

YesERR4.4 Check continuity of the Antenna Control cablefor opens and shorts as outlined in ACC1.1and ACC1.2. Make repairs as necessary andreturn to this section. Was the AntennaControl Cable repaired or replaced?

No ERR4.5

Yes ERR4.5Re-connect the Antenna Control Cable andturn the TAC-92C power ON. Wheninitialization is complete clear this error andmonitor the system for re-occurrence. Doesthis error code and Remote Not Respondingre-occur?

No Return

YesERR4.5 Check continuity of the Spooler Cable foropens and shorts as outlined in SPOOL1.1and SPOOL1.2. Make repairs as necessaryand return to this section. Was the SpoolerCable repaired or replaced?

No ERR4.6

Yes ERR4.6Re-connect the Spooler Cable and turn theTAC-92C power ON. When initialization iscomplete clear this error and monitor thesystem for re-occurrence. Does this errorcode and Remote Not Responding re-occur?

No Return

ERR4.6 RS422 signal checks

ERR4.6.1 TAC-92C TX data signal checks.

YesTurn TAC-92C power OFF and disconnect P1from the rear panel. Turn TAC-92C powerON and check the DC voltage from thejunction of R44 & C49 to ground on the MainPCB. Press and hold the RESET button onthe front panel of the TAC-92C to keep the TXsignal at a steady high state. This voltageshould be approx. -11VDC. Is the TX signalpresent?

No Replace Main PCB and re-check

YesTurn TAC-92C power OFF and re-connect P1to the rear panel. Turn TAC-92C power ONand re-check the DC voltage from the junctionof R44 & C49 to ground on the Main PCB. Isthe TX signal present?

No Replace PCU and re-check



- 4-46 -

YesClear this error and monitor the system for re-occurrence. Does this error code and RemoteNot Responding re-occur?

No Return

ERR4.6.2 TAC-92C RX data signal checks (also see RXNote below).

Yes ERR4.6.4Check the DC voltage from the U24 pin 2 (+)to E4 (-) on the Main PCB. Press and holdthe RESET button on the front panel of theTAC-92C to keep the RX signal at a steadyhigh state. This voltage should be at least3.0VDC. Is the RX signal present?

No Replace the PCU, thenERR4.6.3

Yes ERR4.6.4ERR4.6.3 Re-check the DC voltage from the U24 pin 2(+) to E4 (-) on the Main PCB as above. Thisvoltage should be at least 3.0VDC. Is the RXsignal present now?

No Replace the Main PCB,reinstall the original PCU andre-check

YesERR4.6.4 Verify that the E4/E5/E6 Jumper is shortingE5 to E6. Is the jumper in the correctposition?

No Correct the jumper positionthen next


Clear this error and monitor the system for re-occurrence. Does this error code and RemoteNot Responding re-occur? No Return

RX Note If the system is equipped with Conscan,assure that the 8 value is included in theSYSTEM TYPE parameter and observe theDisk Sensor LED on the Conscan Controller(lower ASPA PCB in the rear panel of theTAC-92C). Activity of the LED’s on theConscan Controller indicates that the RXsignal is present, the jumper is in the correctposition and that the Main PCB is processingthe RX signal and passing it to the ConscanController. This is a very good quickindication of RX processing.



- 4-47 -

ERR5.0 Error Code 0008 – Pedestal function error


Clear this error and monitor the system for re-occurrence. Does this error code re-occur?

No Return



- 4-48 -

ERR6.0 Error Code 0016 – Conscan error

The Conscan Motor Driver PCB generatesfive 2msec pulses per revolution of theeccentric scalar plate. If the timing of thepulses from the Conscan feed is incorrect(time between pulses exceeds 400 msec) aConscan Error will be generated. This errorcode does NOT cause the Error LED toilluminate.

Figure 1 Conscan Pulses

This error may be due to:

1. Eccentric scalar plate is not rotating, notrotating fast enough or is starting andstopping rotation.

2. Conscan (Hall) sensor failure.3. Harness failure.

4. Aux Pol Relay PCB failure.5. PCU failure.6. Main PCB failure.

7. ASPA w/con PCB failure.

Refer to the Pedestal Harness Schematicand Antenna System Schematic drawingsfor all voltage and continuity testing.

YesERR6.1 Clear this error and monitor the system for re-occurrence. Does this error code re-occur? No Return

ERR6.2 Conscan Feed Checks

Turn tracking OFF. Remove the radome top(or open the radome door) to gain access tothe pedestal.

Figure 2 Ku-Band Conscan Feed Assemblies



- 4-49 -

YesRotate the antenna pedestal as needed toview the feed assembly. Visually inspect thefeed. Is it a Conscan feed assembly?

No

Yes ERR6.2.2ERR6.2.1 Refer to figure 2, is the antenna fitted with aConscan modified feed? No

Set TAC-92C parameters for Step Trackoperation and save the parameter changes.EL Step Size = 0002AZ Step Size = 0002

Step Integral = 0060

Re-test ERR6.1

Figure 3 Conscan Motor Driver PCB

YesERR6.2.2 Visually inspect the feed and harnessconnections. Refer to figure 3. Are P1 & P2plugged in correctly?

No Re-connect and re-check

Yes Repair and re-checkAre any wires frayed or broken?

No

Yes ERR6.6ERR6.2.3 Is the eccentric scalar plate rotatingcontinuously CW? No, starting &

stopping ornot rotating

ERR6.2.4 The Conscan drive belt should drive smoothlythrough both sprockets. The tension of thebelt should be only taught enough to preventthe belt from slipping on either sprocket.

Yes Replace belt then nextIs the belt broken?

No

Yes Adjust/bend the motormounting bracket to allow beltto run smoothly and re-check

Is the drive belt dragging on either sprocket?

No

Yes ERR6.2.6ERR6.2.5 Unplug P2 from the Conscan Motor DriverPCB to stop motor drive. Rotate the eccentricscalar plate by hand. The scalar plate shouldrotate freely and easily, with no sticky spots orbinding in rotation. Does the scalar platerotate freely?

No



- 4-50 -


Loosen the drive motor mounting screws andadjust the motor position to disengage thebelt. Rotate the eccentric scalar plate. Is thebearing binding?

No

Yes Replace drive motor and re-test ERR6.2.5

Rotate the drive motor sprocket. Is the motorbinding?

No

ERR6.2.6 Set belt tension by loosening the drive motormounting screws and adjust the motorposition to put only enough tension on the beltto prevent the belt from slipping on eithersprocket. Do NOT over tension the belt.

YesERR6.4 Measure the DC voltage on P1 from pin 1 topin 2. Is the +15VDC OK (>+13VDC)? No ERR6.5

The sensor pulse voltage will be high (5VDC)until the magnet passes under the hall sensor.When the magnet passes under the Hallsensor the pulse voltage will go to low(0VDC). The transition of the pulse must beat least 3.5VDC.

YesMonitor the pulse voltage from U3 pin 17 toground on the Conscan Motor Driver PCBwhile manually rotating the eccentric scalarplate 360 degrees. Is the pulse present (onceper rotation)?

No R pulse missing, replaceConscan Motor Driver PCBand re-check

YesCheck the +12VDC from J2 pin 3 to groundand pin 4 to ground. Is the +12VDC motorvoltage OK (>10VDC)?

No Replace Conscan MotorDriver PCB and re-check

YesPlug P2 and check continuity of the motorwindings measure from:P2-1 to P2-3 or 4 ~38Ù

P2-2 to P2-3 or 4 ~38ÙP2-5 to P2-3 or 4 ~38Ù

P2-6 to P2-3 or 4 ~38ÙP2-1 to P2-2 ~76Ù

P2-5 to P2-6 ~76ÙIs motor winding continuity good?


Yes Motor shorted - Replacemotor and re-check.





No



- 4-51 -

Yes ERR6.6Plug P2 back into the Conscan Motor DriverPCB. Is the eccentric scalar plate rotatingcontinuously CW now?

No Replace Conscan MotorDriver PCB and re-check

ERR6.5 +15VDC Checks

Yes Replace the Conscan MotorDriver (shorted). Plug P1 inand re-test ERR6.4

Unplug P1 from the Conscan Motor Driverand check the +15VDC from P1 pin 1 to pin 2.Is the +15VDC OK (>+13VDC)?

No

YesERR6.5.1 Check the voltage at the Polang Aux RelayPCB from P2 pin 1 to pin 4. Is the +15VDCOK (>+13VDC)?

No ERR6.5.2

YesUnplug P2 and check harness continuity fromPolang Aux Relay PCB P2 to Conscan MotorDriver P1:

P2 pin 1 to P1 pin 1 = ShortP2 pin 4 to P1 pin 2 = ShortP2 pin 7 to P1 pin 3 = Short

Is the harness continuity good?

No Repair harness, restoreconnections and re-testERR6.4

YesERR6.5.2 Unplug P2 and check the voltage at thePolang Aux Relay PCB from J2 pin 1 to pin 4.Is the +15VDC OK (>+13VDC)?

No ERR6.5.3

YesCheck harness continuity from Polang AuxRelay PCB P2 to Conscan Motor Driver P1:P2 pin 1 to P1 pin 2 = OpenP2 pin 1 to P1 pin 3 = Open

P2 pin 4 to P1 pin 1 = OpenP2 pin 4 to P1 pin 3 = Open

P2 pin 7 to P1 pin 1 = OpenP2 pin 7 to P1 pin 2 = OpenP2 pin 1 to Shield = Open

P2 pin 4 to Shield = OpenP2 pin 7 to Shield = Open


No Repair harness, restoreconnections and re-testERR6.4

Yes Replace Polang Aux RelayPCB, re-connection & re-testERR6.4

ERR6.5.3 Check the voltage at the Polang Aux RelayPCB from P1 pin 3 to pin 6. Is the +28VDCOK (>+26VDC)?

No

Yes Replace Polang Aux RelayPCB (shorted), restoreconnections and re-testERR6.4

Unplug P1 and check the voltage at the AuxPolang Relay PCB from P1 pin 3 to pin 6. Isthe +28VDC OK (>+26VDC)?

No



- 4-52 -

YesTurn TAC-92C power OFF and unplug P2from the PCU. Test harness continuity fromPolang Aux Relay P1 to PCU P2:

P1 pin 1 to P2 pin 3 = ShortP1 pin 2 to P2 pin 2 = ShortP1 pin 3 to P2 pin 9 = Short

P1 pin 4 to P2 pin 1 = ShortP1 pin 5 to P2 pin 10 = Short

P1 pin 6 to P2 pin 12 = ShortIs the harness continuity good?


YesTest harness continuity from Polang AuxRelay P1 to PCU P2:


P1 pin 1 to P2 pin 1 = OpenP1 pin 1 to P2 pin 10 = OpenP1 pin 1 to P2 pin 12 = Open



P1 pin 3 to P2 pin 1 = OpenP1 pin 3 to P2 pin 10 = OpenP1 pin 3 to P2 pin 12 = Open


P1 pin 5 to P2 pin 12 = OpenP1 pin 1 to Shield = OpenP1 pin 2 to Shield = Open





Yes Restore connections, turnTAC-92C power ON and re-test ERR6.4

Were harness repairs made in either of theprevious two steps?

No Replace the PCU, restoreconnections, turn TAC-92Cpower ON and re-testERR6.4



- 4-53 -

ERR6.6 TAC-92C Checks

YesERR6.6.1 Check TAC-92C parameters to assure theyare set for Conscan operation:

EL Step Size = 0003AZ Step Size = 0003Step Integral = 0000

System Type = 8, 12, 72 or 76Are these parameters correct?

No Enter correct values, saveparameter changes then re-test ERR6.1

YesRemove the cover of the TAC-92C. Inspectthe cable that connects the ASPA PCBs (J11& J13) to the Main PCB. Is the cableconnected properly?

No Reconnect, then next.

Yes Repair/replace, then next.Are interconnect cable wires frayed orbroken? No

YesCheck JP3 jumper on the Main PCB. Is thejumper in the correct position (shorted)? No Short jumper, then next.

Yes ERR6.1Observe the LEDs mounted on the ASPAw/Conscan PCB (J11 in the Rear Panel). Isthe DISK LED rapidly flashing?

No

ERR6.7 Conscan Pulse Checks

An oscilloscope must be used for the followingchecks.

Yes Isolate short and repair, thenre-check

ERR6.7.1 Turn TAC-92C power OFF. Install the 15-PinIn-Line Test-Point connector between P2 andthe PCU. Check continuity from the testadapter pin 2 to ground. Is the Conscan pulseline shorted?

No

YesCheck continuity from the test adapter pin 2 toConscan Motor Driver J1 pin 3 (wht/grn). Isthe Conscan pulse line continuity OK (short)?

No Isolate open and repair, thenre-check

Yes ERR6.7.2Turn TAC-92C power OFF. Install the 15-PinIn-Line Test-Point connector between P2 andthe PCU. Turn TAC-92C power ON. Refer tofigure 1 and view the signal on P2 pin 2. Arethe Conscan pulses present?

No

Yes Repair PCU to Polang AuxRelay harness open and re-test ERR6.7.1

View the signal at Polang Aux Relay PCB P1pin 2. Are the Conscan pulses present?

No

Yes Replace Polang Aux RelayPCB (open) and re-testERR6.7.1

View the signal at Polang Aux Relay PCB P2pin 7. Are the Conscan pulses present?

No



- 4-54 -

Yes Repair Polang Aux Relay toConscan Motor Driverharness open and re-testERR6.7.1

View the signal at Conscan Motor Driver PCBP1 pin 3. Are the Conscan pulses present?

No

Yes ERR6.7.3ERR6.7.2 At the TAC-92C, open JP3. View signal atJP3. Are the Conscan pulses present oneither pin of JP3?

No

Yes ERR6.7.3Turn TAC-92C power OFF, remove the 15-PinIn-Line Test-Point connector between P2 andthe PCU. Replace PCU and turn TAC-92Cpower ON. Are the Conscan pulses presenton either pin of JP3 now?

No

Yes ERR6.7.3Turn TAC-92C power OFF, replace Main PCBand turn TAC-92C power ON. Are theConscan pulses present on either pin of JP3now?

No

Yes ERR6.7.3Turn TAC-92C power OFF, replace J11 ASPAw/CON PCB and turn TAC-92C power ON.Are the Conscan pulses present on either pinof JP3 now?

No

Yes ERR6.7.3Turn TAC-92C power OFF, replace J13 ASPAand turn TAC-92C power ON. Are theConscan pulses present on either pin of JP3now?


Yes Hard wired Conscan, leaveJP3 open

ERR6.7.3 View the signal at P12 pin 9. Are theConscan pulses present?

No Short JP3

Yes Serial Conscan leave JP3shorted

View the signal at P12 pin 9. Are theConscan pulses present now?

No Replace Main PCB and re-test ERR6.7.3

YesView the signal at TP2 on the J11 ASPAw/CON PCB. Are the Conscan pulsespresent?

No Replace ASPA interconnectcable and re-check.

Yes ERR6.1Observe the DISK LED on the J11 ASPAw/CON PCB. Is the LED rapidly flashing? No Replace J11 ASPA w/CON

PCB and re-check



- 4-55 -

ERR7.0 Error Code 0032 – Reserved for future use



No Return



- 4-56 -

ERR8.0 Error Code 0064 – Reserved for future use



No Return



- 4-57 -

ERR9.0 Error Code 0128 – Satellite Out Of Range

Calculated elevation of the desired satellite isbelow the horizon from the present Latitudeand Longitude (therefore, the Earth itself willblock the signal from that satellite).

This error will occur when the desired satellite(SAT) longitude is too distant from the presentLongitude of the boat. It will also occur whenone, or more, of the entries (LAT, LON and/orSAT) has not been entered properly. Themost common mistakes are not updating theLAT/LON entries and incorrect E/W settings.

YesERR9.1 Clear this error and monitor the system for re-occurrence. Does this error code re-occur? No Return

YesERR9.2 Check Latitude (LAT) entry to assure it iscorrect form the current location of the boat.Is the Latitude entry correct?

No Correct the entry, then next

YesAssure that the North/South (N/S) portion ofthe Latitude is set correctly for the hemispherethat the boat is located in. Is the Latitude N/Sentry correct?


YesERR9.3 Check Longitude (LON) entry to assure it iscorrect form the current location of the boat.Is the Longitude entry correct?


YesAssure that the East/West (E/W) portion of theLongitude is set correctly for the hemispherethat the boat is located in. Is the LongitudeE/W entry correct?


YesERR9.4 Check Satellite Longitude (SAT) entry toassure it is correctly entered for the satelliteyou desire to target. Is the Satellite Longitudeentry correct?


YesAssure that the East/West (E/W) portion of theSatellite Longitude is set correctly for thedesired satellite. Is the Satellite LongitudeE/W entry correct?


YesERR9.5 If the absolute difference between the LONand SAT entries is greater than 50 degreesthe satellite may be below the horizon. Is thedifference between LON and SAT greaterthan 50 degrees?

No ERR9.1

Yes Use another satelliteCalculate the elevation of the desired satellitefrom the present latitude and longitude (useSatCoDX web site or Contact Sea Tel Servicedepartment Sea Tel to calculate). Is the satbelow horizon?

No ERR9.1

FLUX Series 94 Troubleshooting Guide


- 4-58 -

FLUX1.0 Fluxgate PCB failure

Common indications are:

1. Heading error greater than +/- 10 degrees.2. Remote Compensation resulted in a“Comp Range Error”.


FLUX1.1 Turn TAC-92C power OFF and removeradome top (or open the radome door):



YesIs the IDC connection (P14) mated properlyon the Fluxgate PCB? No Re-mate connection and re-

check


FLUX1.2 Fluxgate Sensor continuity

YesTurn TAC-92C power OFF. Disconnect P14from the Fluxgate PCB. Measure continuity ofthe Fluxgate device from J14:Pin 1 to pin 2 ~ 1 ohm

Pin 3 to pin 4 ~ 140 ohmsPin 4 to pin 5 ~ 140 ohms

Is continuity OK?

No Replace the Fluxgate PCB,then COMP1.0

FLUX1.2 Harness continuity

YesDisconnect P1 from the PCU and measurecontinuity from:P14-1 to P1-6 or 22 Short

P14-2 to P1-6 or 22 ShortP14-3 to P1-24 Short

P14-4 to P1-16, 17 or 31 ShortP14-5 to P1-39 Short


No Repair and re-check

Yes COMP1.0Were repairs made to the harness in theprevious step? No Replace the PCU, then

COMP1.0

Series 94 Troubleshooting Guide HOME


- 4-59 -

HOME1.0 Home Sensor / Home Flag

Home sensor read error may cause:

1. During initialization elevation does not stopwhen reaching correct angle (where levelcage is approximately level)2. Elevation motor moves the antenna up3. Antenna does not stop, or change speed atthe horizon.


HOME1.1

Figure 1 Level cage and Home Flag

Turn the TAC-92C power OFF. Remove theradome top (or open the radome door) to gainaccess to the pedestal.

YesRotate the level cage through its 90 degreerange of rotation. The level cage shouldrotate freely and easily with light fingerpressure. Does the level cage rotate freely?


Yes Re-route or tie cables awayfrom the level cage and re-check.

Assure that the cables in the area are notrestricting or binding the free rotation of thelevel cage. Is there cable restriction noted?

No


Check the drive belt. Is the belt broken orloose?

No


check

YesAre the harness and motor IDC connectionsto J15 & J16 mated properly on the levelplatform PCB


Yes Repair and re-check.Are the wires in the IDC connectors (P15 &P16) broken or frayed? No

YesIs the home flag cam tight on the shaft?


HOME Series 94 Troubleshooting Guide


- 4-60 -

HOME1.2 Home Flag signal

Yes HOME1.4Rotate the level cage to be about level.Monitor the DC voltage from J16 pin 1 toground as the level cage is rotated slightlyCW/CCW from the level position. The HomeFlag DC voltage should change from 0VDC to5VDC. Does the Home Flag voltage changeat some point of rotation near level?

No

HOME1.3 Home sensor fault

Yes Replace the level platformPCB and re-test HOME1.2

Measure the DC voltage from J16 pin 5 toground. Is the 5VDC OK?

No

HOME1.4 Harness Continuity

HOME1.4.1 Turn TAC-92C power OFF.



YesDisconnect P16 from the level platform PCBand check continuity from:P16-1 to P1-1 = Short


Is continuity good?






No

Yes HOME1.2HOME1.4.2 Were repairs made to the harness in theprevious three steps?

No Replace PCU and re-testHOME1.2

Series 94 Troubleshooting Guide INIT


- 4-61 -

INIT1.0 Antenna Initialization

Initialization Test - Each time power to thesystem is cycled the antenna will go through aspecific sequence of steps (listed below) toinitialize the antenna. These phases initializeazimuth, the level cage, elevation and cross-level to predetermined starting positions.Initialization takes about two minutes.

NOTE: Some of the actions of the antennaduring initialization occur simultaneously,when trying to isolate failures it may benecessary to cycle power several times toview each of these phases independently.

INIT1.1 Setup – Turn the TAC-92C power OFF andremove the radome top (or open the radomehatch on larger systems).

Inspection OKINIT1.1.1 Visually inspect the inside surface of theradome top and of the antenna pedestal.Look for water or condensation, rust orcorrosion, white fiberglass power residue,loose wiring connections, loose hardware,loose or broken belts or any other signs ofwear or damage.

Items noted VIS1.0

Rotation OKINIT1.1.2 Rotate the antenna in azimuth until it ispointed toward the bow. Rotate elevation ofthe antenna UP to zenith (90 degrees).Rotate the level cage fully CW to the stop. Tiltthe antenna off-level (left/right) about 10degrees.

MechanicalBinding isnoted

ROM1.0

INIT1.1.3 Have someone turn TAC-92C power ON andcarefully observe each of the initializationphases of the antenna during “power-up”cycle to verify that each phase completescorrectly. This information assists in isolatinga problem.

NOTE: Sun reflecting into the level cage mayadversely affect the initialization of the levelcage. Shield the sun penetration with yourhands during the first 30 seconds ofinitialization.

INIT Series 94 Troubleshooting Guide


- 4-62 -

INIT1.2 Initialization phases

Yes

Yes, butantenna wasnot pointed tothe port side.

MINST1.0

No, it did notrotate.

AZD1.0

No, it onlyturned CWabout 60degrees.

ENC1.0

INIT1.2.1 The antenna will rotate CW in azimuth to themechanical stop (antenna should now bepointing to the port side). The antenna will“tick” against the CW stop for severalseconds. Does this phase completecorrectly?

No, antennarotated CCWafterinitialization

ENC1.0

Yes

No level cagedid not drive

LEV1.0

INIT1.2.2 The level cage rotates full CCW and “ticks”against the stop for several seconds. Thenthe level cage will rotate CW to 15° (2094),25° (2494) or 5° (3294, 4094 & 4894). Doesthis phase complete correctly? No, level cage

drives thewrongdirection

LEV1.0

Yes

No elevationdrive.

ELD1.0

No, elevationdoes not stopwhen reachingcorrect angle(where levelcage isapproximatelylevel).

HOME1.0

INIT1.2.3 The elevation motor drives the equipmentframe to bring the level cage to level (front toback) which results in the elevation of the dishsubsequently being at 15° (2094), 25° (2494)or 5° (3294, 4094 & 4894) up from thehorizon. Elevation should drive quickly bringthe level cage to approximately level where itwill abruptly change speed to slowly bring thelevel cage to level. Does this phase completecorrectly?

No, antennareaches thispositionmomentarilythen drives tothe upper orlower stop(s)

ELR1.0 and TILT1.0

Yes

No cross leveldrive or drive“jerks” thebeam

CLD1.0

INIT1.2.4 The cross level motor smoothly drives toapproximately “level” the cross level beam(and the level cage) in left-to-right tilt. Doesthis phase complete correctly?

No, cross leveldrives to theleft or rightstop(s)

CLR1.0 and TILT1.0

Series 94 Troubleshooting Guide INIT


- 4-63 -

YesINIT1.2.5 During the two minute initialization periodcross level and elevation should continue toslowly bring the level cage to “level” in boththe left-right and the front-back axes. Is thelevel cage “level” +/- 2 degrees?

No, level cageis not level ordoes not staylevel duringantennamotion.

TILT1.0

Yes Return

No, systemkeeps goingintoinitialization

VoltSel1.0

INIT1.3 Initialization completed. Did initializationcomplete satisfactorily?

No, ACUdisplays“Remote NotResponding”

ERR4.0

LEV Series 94 Troubleshooting Guide


- 4-64 -

LEV1.0 Level Cage Drive problems

Loss of proper level cage drive could be dueto belt, motor or harness failure or due tomechanical binding. This directly affectsproper Elevation operation of the antenna(pointing, tracking and stabilization).

Refer to the Pedestal Harness Schematicand Antenna System Schematic drawingsfor all voltage and continuity testing.

Turn the TAC-92C power OFF. Remove theradome top (or open the radome door).

YesLEV1.1 Rotate the level cage through its 90 degreerange of rotation. The level cage rotate freelyand easily with light finger pressure. Does thelevel cage rotate freely?


Yes Re-route or tie cables awayfrom the level cage and re-check.

Assure that the cables in the area are notrestricting or binding the free rotation of thelevel cage. Is there cable restriction noted?

No


Check the drive belt. Is the belt broken orloose?

No


check

YesAre the harness and motor IDC connectionsto J12 & J13 mated properly on the terminalboard (TB4)?


Yes Repair and re-check.Are the wires in the IDC connectors (P12 &P13) broken or frayed? No

Yes Return

No, level cagedrives thewrongdirection

LEV1.6

LEV1.2 Level cage drive test: Turn the TAC-92Cpower ON and observe the level cage whilethe antenna is initializing (CCW to the stop,then CW the correct number of degrees forthe model of the antenna), or while stepping,slewing or targeting elevation (cage rotatesCW to increase elevation, CCW to lowerelevation). Is level cage drive restored?

No drive

Series 94 Troubleshooting Guide LEV


- 4-65 -

LEV1.3 +12VDC test

Yes > 11VDC LEV1.4

No, voltage islow or missing

LEV1.7

Check DC voltage from J12 and J13 pin 3 toground and pin 4 to ground. Is the +12.0 VDCOK?



LEV1.4 Motor (M4) Continuity

YesDisconnect P13 and check continuity of themotor windings (note: P13-3 and P13-4 maybe transposed on some motors), measurefrom:P13-1 to P13-3 or 4 ~38Ù

P13-2 to P13-3 or 4 ~38ÙP13-5 to P13-3 or 4 ~38Ù




Yes Motor shorted - Replacemotor and re-check.





No

Yes ReturnReconnect P13. Re-test level cage drive. Islevel cage drive restored? No

LEV1.5 Harness Continuity

LEV1.5.1 Turn TAC-92C power OFF





- 4-66 -

Yes Repair and re-checkDisconnect P12 from TB4 and checkcontinuity from:







Is harness shorted?

No

YesCheck continuity from:


P12-4 to P1-41 = ShortP12-5 to P1-9 = ShortP12-6 to P1-21 = Short

Is continuity good?


Yes LEV1.2LEV1.5.2 Were repairs made to the harness in theprevious three steps? No

Yes ReturnReplace PCU (failed drivers), re-connect allcables and turn TAC-92C power ON. Is levelcage drive restored? No Contact Sea Tel Service

department

LEV1.6 Level Cage drives wrong direction

YesVerify motor wire color code to P13 perPedestal Harness Schematic. Is the P13wired correctly?




Yes LEV1.5Plug spare motor (unmounted) into TB1.Does spare motor turn same direction as theinstalled motor?

No Replace motor and re-testLEV1.2

LEV1.7 +12VDC is low (< 11VDC) or missing

YesLEV1.7.1 Is the +12.0 VDC approximately half thenominal voltage? No LEV1.7.3

Series 94 Troubleshooting Guide LEV


- 4-67 -



Yes > 11VDC Re-test LEV1.2LEV1.7.2 Re-check DC voltage from J12 and J13 pin 3to ground and pin 4 to ground. Is the +12.0VDC OK now? No

Yes Motor short – Replace motorthen LEV1.7.2

LEV1.7.3 Disconnect P13 from TB4 and check +12VDCfrom J12 pin 4 to ground. Is the +12.0 VDCOK? No

Yes TB4 short - Repair/replaceTB4, then LEV1.7.2


Yes Harness open/short -LEV1.5.1 then next

Disconnect P1 from the PCU and check theDC voltage From J1 pins 40, 41, 42, 43 and44 to ground. Is the +12.0 VDC OK? No LEV1.7.4

Yes LEV1.7.2Turn TAC-92C power OFF and reconnect P1,P12 and P13. Turn TAC-92C power ON andre-check DC voltage from J12 and J13 pin 3to ground and pin 4 to ground. Is the +12.0VDC OK?


LEV1.7.4 Turn TAC-92C power OFF. Install the 15-PinIn-Line Test-Point connector between P2 andthe PCU. Turn TAC-92C power ON.

Yes +12VDC regulator failure -Replace PCU then LEV1.8

Check DC voltage from P2-15 to groundunder load. This may also be done byopening the back-shell of P2 to access pin 15OR by opening the PCU and access on U14pin 5. Is the voltage +24VDC or greater?

No



No



Yes PCU short – replace PCU,then LEV1.8


No

Yes Spool cable – SPOOL1.0then LEV1.8

LEV1.7.5 Unplug the 9-pin Circular plug from thebracket (jack) in the base-pan of the radome.Check the DC voltage at the plug from pin 9 topin 5. Is the voltage +26VDC or greater?

No

Yes ACC1.0 then LEV1.8LEV1.7.6 Unplug P1 from the rear panel of the ACU andcheck the DC voltage from J1-9 to J1-5. Is thevoltage +26VDC or greater?

No



- 4-68 -

Yes Loss of +28VDC path –Replace Main PCB thenLEV1.8


No

YesLEV1.7.7 Turn the TAC-92C Power OFF, unplug the ACline cord from the rear panel and extract thevoltage select block. Test both fuses (250V2Amp Slow-Blow). Are BOTH fuses good?


Yes LEV1.8Re-insert the voltage select block (assure it isin the correct orientation for the AC linevoltage) and re-install the AC line cord. TurnTAC-92C power ON and test DC voltage fromMain PCB connector J5-3 to ground. Is thevoltage +28VDC restored (> +26VDC)?

No TAC1.0 then LEV1.8

Yes > 11VDC Re-test LEV1.2LEV1.8 Turn TAC-92C power OFF and reconnect allunplugged connections. Reinstall ACU &PCU covers as necessary. Turn TAC-92Cpower ON and re-check DC voltage from J4and J5 pin 3 to ground and pin 4 to ground. Isthe +12.0 VDC OK now?


Series 94 Troubleshooting Guide MINST


- 4-69 -

MINST1.0 Mechanical Installation

When the radome is properly installed, thecenter of the mechanical range of rotation ofthe antenna pedestal will be aligned/orientedin-line with the bow of the boat (+/- 5degrees). To accurately target satellites, anymisalignment of the antenna must be addedto/subtracted from the magnetic variation andentered in the AZ TRIM parameter.

MINST1.1 Turn TAC-92C power OFF and removeradome top (or open the radome door):

YesRotate the antenna full CCW. Is the antennanow pointed directly to the starboard side ofthe boat?

No Note amount of mountingerror CW/CCW

YesRotate the antenna CW 270 degrees. Is theantenna now pointed directly in-line with thebow?


YesRotate the antenna full CW (another 270degrees CW). Is the antenna now pointeddirectly to the port side of the boat?


Yes MINST1.2Is there mounting error?

No MINST1.4

MINST1.2 Mounting error

Yes MINST1.3If the amount of error is small (5 degrees) itshould be documented and adjusted using AZTRIM parameter. Any error can be adjustedthis way, but it may be preferred to re-orientthe mounting of the radome to minimize theamount of mounting error. Is the mountingerror < +/- 5 degrees?

No

Yes Re-orient and re-testMINST1.1

Will the radome mounting be re-oriented tominimize the error?

No, use theexisting error

MINST1.3

MINST1.3 Calculating AZ TRIM with mounting error

Note the sign (+/-) of the mounting error notedin the previous step (all three positions willhave been off the same direction and thesame amount). CW values will be a positivenumber and CCW values will be negative.Annotate this mounting error in your manualfor future reference.

Note the magnetic variation for the presentgeographic location of the boat.

MINST Series 94 Troubleshooting Guide


- 4-70 -

Add the Mounting Error and the MagneticVariation. Multiply the sum of these twovalues by 10. Enter this calculated value intothe AZ TRIM parameter. When entering anegative number, key the numeric value inusing the numeric keypad, then press theN/S/E/W key (to make it a minus value), thenpress the ENTER key. Be sure to save thisnew parameter setting.

Return

MINST1.4 Calculating AZ TRIM (NO mounting error)

Note the magnetic variation for the presentgeographic location of the boat.

Multiply this value by 10. Enter this calculatedvalue into the AZ TRIM parameter. Whenentering a negative number, key the numericvalue in using the numeric keypad, then pressthe N/S/E/W key (to make it a minus value),then press the ENTER key. Be sure to savethis new parameter setting.

Return

Series 94 Troubleshooting Guide ROM


- 4-71 -

ROM1.0 Range of Motion


Yes ROM1.3Inspect inside of radome for signs that thedish or feed have been rubbing against theinside of the fiberglass radome. Are theresigns of rubbing?

No

YesROM1.1 Rotate the pedestal through 540 degree rangeof azimuth motion. The antenna should rotatefreely and easily with light finger pressure. Dothe azimuth bearings rotate freely with nobinding in Azimuth?


Yes Re-route or tie cables awayfrom pedestal and re-check.

Assure that the cables in the base of theradome are not restricting or binding the freerotation of the pedestal. Is there cablerestriction noted?

No


Check the azimuth drive belt. Is the beltbroken or loose?

No

YesROM1.2 Rotate the pedestal through full range ofelevation rotation. The antenna should rotatefreely and easily with light finger pressure.Does the elevation rotate freely with nobinding?


Yes Re-position cables forsufficient slack and re-check.

Assure that the cables on the pedestal are notrestricting or binding the free rotation of theequipment frame. Is there cable restrictionnoted?

No


Check the elevation drive belt. Is the beltbroken or loose?

No


ROM1.3 Rotate the antenna in azimuth and elevation,all around inside the radome to assure thatthe dish and/or feed do not rub at anyhemispheric point against the inside surfaceof the radome top. Is any rubbing noted?

No

YesROM1.4 Tilt the antenna off-level (left/right) through thefull range of cross level motion (+/- approx. 30degrees). . The antenna should rotate freelyand easily with light finger pressure. Doescross level rotate freely with no binding?


Yes ReturnROM1.5 Rotate the level cage through the full 90degrees of rotation from CCW stop to CWstop. The level cage antenna should rotatefreely and easily with light finger pressure.Attached cables should not cause the cage tospring back more that a few degrees fromeither stop when released. Does cross levelrotate freely with no binding?


SIG Series 94 Troubleshooting Guide


- 4-72 -

SIG1.0 RF/IF Signal Distribution Problems

SIG1.1 TAC-92C setup

Use the Quick Start guide in section 2 toassure that LAT, LON & SAT are set correctly.

Press sat to view the tracking receiverselection and tuning frequency. This shouldbe set to INA #### or INB #### (lower left)and the AGC (signal level value) should bedisplayed in the lower right

If Gyrocompass input is being used, assurethat the TAC-92C heading is set to thepresent true heading of the boat. IfGyrocompass input is not being used, assurethat AZ Trim parameter is set to the correctMagnetic Variation (+/- any mechanicaloffset).

Assure system type set to 64, 68, 72 or 76.Save parameters.

Target the desired satellite and allow thesystem to search.

Yes SIG1.3SIG1.2 Does the TAC-92C acquire & track anysatellite (tracking LED ON)? No SIG1.6

SIG1.3 Tracking a satellite

Yes SIG1.4SIG1.3.1 Is any programming viewable on any of thereceivers (preview or subscription programs)? No SIG1.6

Yes Rotate/move boat to eliminateblockage and re-test SIG1.3.1

Assure that there is no blockage between theantenna and the desired satellite causingsignal loss. Is there blockage? No

YesTurn tracking OFF, select Elevation entry,press the UP arrow to step the antenna upOFF satellite and note the AGC value. Pressthe DOWN arrow to step the antenna downonto satellite, turn tracking ON and allowtracking to peak the satellite signal. Note thepeak AGC value. Is the difference in AGCvalue between Peak and OFF satellite greaterthat 200 counts?

No Satellite signal may be tooweak or LNB/LNB has failed.

Search for adjacent satellite at higher or lowerazimuth/elevation positions. Re-test SIG1.3.1for each adjacent satellite found.

SIG1.4 Receiver programming present

Series 94 Troubleshooting Guide SIG


- 4-73 -

At each receiver make the menu selections todisplay the “signal meter”. If multiplereceivers are available, set one receiver to“Transponder 2” and another to “Transponder1” for a quick check of system performance.Each receiver must be tested buy changingtransponders to display the signal level ofboth even and odd transponders. This willcheck both LNB inputs to the matrix switch.

If the system is fitted with a Linear feed,optimize the polarization of the feed.

Yes SIG1.5Is there signal level displayed on both the oddand even transponders on any one of thereceivers?

No

Even or Odd transponder signal level only? SIG1.8

SIG1.5 IF OK

System is on the correct satellite and signallevel is available on a receiver. If the signallevel is too low the receiver(s) may not beable to process the programming of somechannels.

YesIf one receiver is operating all others shouldalso operate. Connect the operating receiverto each of the other receiver outputs on thematrix switch. Does the receiver operate onall other outputs?

No Replace matrix switch and re-check.

If any other receiver does not operate, isolatefaulty coax(es) or receiver(s).

If subscription services are not available onany of the receivers, Contact Sea Tel Servicedepartment service provider for assistance.

Return

SIG1.6 No satellite tracking

YesDisconnect coax from the TAC-92C andmonitor DC voltage at the INA connector.Select INA and tune receiver to 11699, verifythat the DC voltage is 12-14VDC (14VDCmax). Tune receiver to 11700 and verify DCvoltage is 18-21VDC (21VDC max). Is the DCvoltage output OK?

No DC voltage failure,repair/replace TVRO tunerand re-check

SIG1.7 AGC checks

Yes TAC2.0Note the unterminated AGC level. Is the AGCdisplayed 0000 or 4095? No

YesConnect a spare LNB to INA input connectorto indicate amplification level. The AGCshould increase dramatically above theunterminated AGC value (>1000 counts).Does the AGC increase dramatically?

No AGC failure, repair/replaceTVRO tuner and re-check

Reconnect coaxes and re-tune receiver tofrequency for desired satellite

SIG Series 94 Troubleshooting Guide


- 4-74 -

Yes Replace LNB and re-testSIG1.2

SIG1.8 Test the DC voltage on the coaxes at theLNB. One coax should 18-21VDC, the othermay be 12-14VDC (may be switchingbetween ~13VDC and ~18VDC at 5 sec rate).Is the DC voltage good on both coaxes?

No Isolate faulty coax, matrixswitch to restore DC voltageto feed, then re-test SIG1.2

Series 94 Troubleshooting Guide SPOOL


- 4-75 -

SPOOL1.0 Spooler Cable

Refer to Antenna System Schematic

SPOOL1.1 Turn TAC-92C power OFF. Visually inspectconnections.


Inspect the 9-pin Circular jack in theconnector bracket mounted in the base-pan ofthe radome. Are any pins bent, broken orpushed into the body of the connector?

No

Yes Straighten, reseat or replacepins as needed, then next.

Inspect P2 on the PCU. Are any pins bent,broken or pushed into the body of theconnector? No

Yes Repair and re-check.Inspect P1 on the Aux Pol PCB. Are anywires in the IDC connector P1 broken orfrayed?

No

SPOOL1.2 Continuity checks

YesCheck continuity from P2 to the 9-pin CircularJack or to the IDC connector P1:P2-1 to P1-4 = Short


P2-4 to N/CP2-5 to Circ-3 = Short

P2-6 to Circ-2 = ShortP2-7 to Circ-8 = ShortP2-8 to N/C


P2-11 to N/CP2-12 to P1-6 = ShortP2-13 to Circ-1 = Short

P2-14 to Circ-5 = ShortP2-15 to Circ-9 = Short

P2-metal body to Circ-spade = ShortIs continuity good?


SPOOL Series 94 Troubleshooting Guide


- 4-76 -

Yes Repair and re-checkCheck continuity from P1-metal body (shield)to P1 pins:







Is harness shorted?

No

Check continuity from P2 wires to each other:









P2-2 to P2-14 = OpenP2-2 to P2-15 = OpenContinue checking continuity on next page

Series 94 Troubleshooting Guide SPOOL


- 4-77 -

Yes Repair and re-checkContinue checking continuity from P2 wires toeach other:















P2-9 to P2-15 = OpenAre any of these harness lines shorted?

No

SPOOL Series 94 Troubleshooting Guide


- 4-78 -

Continue checking continuity from P2 wires toeach other:





Are any of these harness lines shorted?

Re-connect the three connections Return

Series 94 Troubleshooting Guide TAC


- 4-79 -

TAC1.0 TAC-92C Power Supply

The TAC-92C Power-up display shouldinitially show the TAC-92C software version,then “Remote Initializing” for about 2 minutes.After the antenna initializes the remote (PCU)model & software version will be displayed.

The TAC-92C Power Supply provides the DCvoltages required for normal operation of itscircuit boards and the +28 VDC for theAntenna.

TAC1.1 AC line input checks

The AC line input supply must be 110VAC +/-10% or 220VAC +/- 10% true RMS. PseudoAC sources may not provide adequateoperation.

YesCheck AC line input voltage at the outlet. Isthe AC line input voltage OK at the outlet? No Correct line supply and re-

check

YesIs the AC voltage OK at ACU end of the ACcord? No Replace power cord and re-

check

YesCheck the voltage select/fuse blockorientation. Is the voltage select set for thecorrect line voltage?

No Extract and re-insert set forthe correct voltage selection

Yes TAC1.1.2TAC1.1.1 Remove the top cover of the TAC-92C. TurnTAC-92C power ON and measure AC voltageon the barrier strip near the power module. If110VAC: terminal 1-2 = 110VAC and terminal3-4 = 110VAC. If 220VAC: terminal 1-2 =220VAC. Is the AC input voltage OK?

No

YesTurn power OFF, extract voltage select/fuseblock. Test fuses. Fuses OK? No Replace fuse(s) then next

YesRe insert the voltage select/fuse block (incorrect voltage selection). Unplug the powercord and measure continuity from each side ofthe plug receptacle to the terminal strip. Iscontinuity of the power module OK?

No Replace power module andre-check

Yes Re-test TAC1.1.1Check continuity of transformer primary andwiring to transformer to isolate shortedprimary or wire shorted to ground. Iscontinuity good?


Yes TAC1.2TAC1.1.2 Measure the 40-44 VAC from “~” to “~” on thebridge rectifier. Is the AC voltage into thebridge rectifier OK?

No

Isolate faulty transformer secondary, harnesswires or bridge rectifier. Repair and re-testTAC1.1.2

TAC1.2 DC supply checks

TAC Series 94 Troubleshooting Guide


- 4-80 -

Yes TAC1.2.2TAC1.2.1 Measure 26-28 VDC from J5-3 to ground. Isthe +28 VDC OK?

No

Yes Repair harness and re-testTAC1.2.1

Measure 26-28 VDC from the “+” side of thebridge rectifier to ground. Is the +28 VDCOK? No

Yes Isolate short using TAC1.3Disconnect P5 from the main PCB. Is the +28VDC OK now? No

Yes Replace DC-DC converterand re-check

Disconnect IDC plug from the DC-DCconverter. Is the +28 VDC OK now?

No

Isolate faulty bridge rectifier, shorted filtercapacitor or wiring. Repair then re-testTAC1.2.1.

Yes TAC1.2.3TAC1.2.2 Measure 26-28 VDC from J5-4 to ground. Isthe –28 VDC OK? No


Measure 26-28 VDC from the “-” side of thebridge rectifier to ground. Is the –28 VDCOK? No

Yes Isolate short using TAC1.3Disconnect P5 from the main PCB. Is the –28VDC OK now? No

Isolate faulty bridge rectifier, shorted filtercapacitor or wiring. Repair then re-testTAC1.2.2.

Yes TAC1.4TAC1.2.3 Measure the +12 VDC from J5-1 to ground.Is the +12 VDC OK? No

Yes Isolate short using TAC1.3Disconnect P5 from the main PCB. Is the +12VDC OK now? No


Measure the +12 VDC from DC-DC converterpin 3 to ground. Is the +12 VDC OK?

No

Yes Replace DC-DC converterand re-test TAC1.2.3

Measure the +28 VDC from DC-DC converterpin 2 to ground. Is the +28 VDC OK?


TAC1.3 Isolating Short to Main PCB

Turn TAC-92C power OFF. With P5disconnected, inspect all other cableconnections on the Main PCB. Are all cablesconnected correctly?

Are any connections frayed or broken?

If a NMEA input is connected to J-13 on therear of the TAC-92C, measure cablecontinuity for shorted conductors. Repairshorted connection if found then next.

Series 94 Troubleshooting Guide TAC


- 4-81 -

If a NMEA/M&C input is connected to J-11 onthe rear of the TAC-92C, measure cablecontinuity for shorted conductors. Repairshorted connection if found then next.

Disconnect the Antenna Control Cable, referto ACC1.0 to check for shorted conductors.Repair shorted connection if found, re-connectAntenna Control Cable, then next.

YesTAC1.3.1 Continuity from J5-1 to ground should not beshorted. Is J5-1 shorted to ground? No TAC1.3.2

YesDisconnect P2 from the NMEA (J-13) PCB. IsJ5-1 still shorted to ground? No Repair/replace ASPA NMEA

PCB and re-check

YesDisconnect P2 from the NMEA/M&C (J-11)PCB. Is J5-1 still shorted to ground? No Repair/replace ASPA

w/Conscan NMEA/M&C PCBand re-check

YesDisconnect P1 from the TVRO Tuner. Is J5-1still shorted? No

Yes Replace Main PCB and re-test TAC1.3.1

Disconnect P8 (display ribbon cable) from theMain PCB. Is J5-1 still shorted?

No

Isolate shorted cable, Front PanelInterconnect PCB or Display Module.Repair/replace faulty component, then re-testTAC1.3.1

YesTAC1.3.2 Continuity from J5-3 to ground should not beshorted. Is J5-3 shorted to ground? No TAC1.3.3


PCB and re-check






No


YesTAC1.3.3 Continuity from J5-4 to ground should not beshorted. Is J5-4 shorted to ground? No TAC1.4

TAC Series 94 Troubleshooting Guide


- 4-82 -


PCB and re-check






No


Yes ReturnTAC1.4 Reconnect P5, turn TAC-92C power ON andcheck all displays and antenna controlfunctions. Are all displays and functions OK?

No Refer to appropriatetroubleshooting procedure ormodule.

Series 94 Troubleshooting Guide TILT


- 4-83 -

TILT1.0 Tilt Sensor

Tilt sensor offset errors or drive faults maycause any of the following symptoms;

1. Level cage is not level within +/- 2 degreesin Cross Level or Elevation.2. Antenna slowly tilts in Cross Level,Elevation or both (may slowly drive to eitherstop in the affected axis).

Refer to the Antenna System Schematicand the Pedestal Harness Schematic for allvoltage and continuity checks..

TILT1.1 Turn TAC-92C power OFF and removeradome top (or open the radome door):


Fig 1 Level Platform PCB and connectionsInspect the tilt sensor PCB to assure that theleads on the under-side of the PCB are notshorted to the level cage enclosure (thereshould be two plastic spacers between thePCB and the aluminum). Are any leadsshorted?

No

YesVisually inspect the Tilt Sensor. It should bemounted level/flush to the PCB. Is the sensormounted correctly?

No Replace

YesVisually inspect the Tilt Sensor. The fluidlevel (inside the enclosure) should be ¼ to 1/3full. Is the fluid level OK?

No Replace

YesInspect the two 5-pin IDC connectors (J16 hasthree wires and J15 has five wires). Assurethey are plugged in correctly (orientation ofthe wires, no gaps between connectors orexposed pins on the header). Are theconnectors plugged in correctly?


Yes Repair and re-checkAre any wires in the IDC connectors (J15 &J16) broken or frayed? No

TILT Series 94 Troubleshooting Guide


- 4-84 -

YesRotate the level cage through the full 90degrees of rotation from CCW stop to CWstop. The level cage antenna should rotatefreely and easily with light finger pressure.Attached cables should not cause the cage tospring back more that a few degrees fromeither stop when released. Does cross levelrotate freely with no binding?



check

TILT1.2 Level check

Turn TAC-92C power ON. After Initializationis complete turn tracking OFF.

Yes ReturnTILT1.2.1 Place a bubble level on the top of the levelcage to evaluate Cross Level and Elevation.Are both axes level and stable now? No, either not

level or notstable.

Yes TILT1.3Is either axis not stable (slowly tilting in case 2above)?

No

Yes TILT1.5Are both axes stable (not slowly tilting) but notlevel (case 1 above)?

No TILT1.2.1

TILT1.3 Continuity checks

YesTurn TAC-92C power OFF. Disconnect P1from the PCU and P15 from the level platformPCB. Check continuity from:P15-1 to P1-30 = Short


P15-4 to P1-14 = ShortP15-5 to P1-2 = ShortIs continuity good?


Yes Repair and re-checkCheck continuity from:P15-1 to P15-2 = Open





Is the harness shorted?

No

Series 94 Troubleshooting Guide TILT


- 4-85 -

YesWere harness repairs accomplished in eitherof the two previous steps? No TILT1.4

Yes TILT1.4Re-connect P1 & P15. Turn TAC-92C powerON. Is the antenna still slowly tilting in CrossLevel, Elevation or both?

No TILT1.2.1

TILT1.4 Tilt Sensor drive voltage checks

The Tilt Sensor drive voltages are 0-5Vsquare wave signals that should measureapproximately 2.5VDC with a DC Voltmeter.

YesCheck voltage from J15-5 to ground ~ 2.5volt. Is the drive signal present? No Replace PCU and re-check.

YesCheck voltages from:

J15-1 to ground ~ 2.5 voltsJ15-2 to ground ~ 2.5 volts

J15-3 to ground ~ 2.5 voltsJ15-4 to ground ~ 2.5 voltsAre the drive signals present?

No Replace Level Sensor PCBand re-check.

Yes Replace PCU and re-check.Is the antenna still slowly tilting in CrossLevel, Elevation or both? No TILT1.2.1

TILT1.5 Level Cage is near level and is not slowlytilting -Tilt Sensor offset error

Press MODE until the TAC-92C displaysREMOTE TILT. Press the UP arrow to entertest mode

Press the 4 and 6 keys to adjust Cross Levelaxis of the Level Cage to within +/- 0.5degrees.

Press the 2 and 8 keys to adjust Level(Elevation) axis of the Level Cage to within +/-0.5 degrees.

Press the DOWN arrow key to exit test mode.Press the MODE key to display REMOTEPARAMETERS. Press the UP arrow keyonce then press the ENTER key to save thenew offset bias to the PCU.

TILT1.2.1

UNWRAP Series 94 Troubleshooting Guide


- 4-86 -

UNWRAP1.0 Unwrap LED is lit frequently or constantly

YesAntennas shipped after January 1997 do NOThave encoders. These (current) antennaskeep track of the relative position of theantenna by counting steps issued to theazimuth motor. When the encoder in an oldersystem fails Sea Tel recommends installationof new PCU to convert to “encoder-less”operation rather than replacing the encoder.Is this antenna “encoder-less”?

No ENC1.0

Loose belt tension, mechanical binding(bearings or cable interference) or drag(rubbing against the inside of the radome top)during azimuth rotation will cause the drivemotor to “pulse slip”. When this happens thePCU has issued a step to the azimuth motor,and incremented/decremented the relativeposition of the antenna, but the pedestal didnot actually rotate. The resultant azimuth andheading displays will also be incorrect. Asthese “missed” steps accumulate the displaysbecome increasingly more inaccurate and thesystem will not unwrap at the correct positions(5 degrees prior to the mechanical stops). Itmay not be able to initialize correctly to beginwith and will not track or target satellitescorrectly.

UNWRAP1.1 Assure that the antenna rotates freely (followcorrective actions in ROM1.0-1.3 for anyproblems found)

ROM1.0-1.3

Yes UNWRAP1.4UNWRAP1.2 If the radome top has been removed, leave itoff, turn TAC-92C power ON and observeinitialization and operation. Does the antennastill frequently unwrap?

No

UNWRAP1.3 If the radome top was removed during theprevious step, reinstall it, turn TAC-92C powerON and observe initialization and operation.If the antenna does NOT frequently unwrapwith the radome top OFF, but DOES unwrapfrequently with the radome top ON, ContactSea Tel Service department Sea Tel servicedepartment for instructions.

UNWRAP1.4 When the antenna drives to the stops when“A” command is issued OR the antenna doesnot stabilize in azimuth axis properly theproblem may be a rate sensor read error.

AZR1.0

Series 94 Troubleshooting Guide VIS


- 4-87 -

VIS1.0 Visual Inspection

Setup – Assure that the TAC-92C power isOFF

Yes Contact Sea Tel Servicedepartment to report findings.

VIS1.1 Visually inspect the outside surface of theradome top and base for cracks or otherdamage. Is any damage found? No

VIS1.2 Remove the radome top or open the radomehatch (on larger systems) to visually inspectthe inside surface of the radome top and theantenna pedestal.

YesVIS1.2.1 Are there signs of water or condensation?

No VIS1.2.2

Yes

There are noweep holes

Contact Sea Tel Servicedepartment

Are the 1/8th inch weep holes in the radomebase clogged?

No VIS1.2

Assure that the weep holes are open to allowthe radome to “breathe” and to allow anystanding water to leak out.

Dry condensation off inner surface of theradome and off the pedestal, dish and feedareas.

YesVIS1.2.2 Are there scratches in the inside surface ofthe radome top or white fiberglass powerresidue inside the radome?

No VIS1.2.3

This indicates that the dish or feed has beenrubbing against the inside surface of theradome. Carefully inspect the edge of thedish, cables that wrap around the edge of thedish and the feed and note any findings.

Contact Sea Tel Servicedepartment to report findings.

YesVIS1.2.3 Are there signs of loose hardware?

No VIS1.2.4

Tighten all loose hardware. If hardware isfound in the base try to locate where it cameoff of and re-attach it.

YesVIS1.2.4 Are there signs of rust or corrosion?

No VIS1.2.5

Minor rust and corrosion can be cleaned off.If necessary a light coating of CRC can beapplied to affected (mechanical) areas [doNOT apply to electrical Contact Sea TelService departments].

Major rust and corrosion should be thoroughlyinspected and reported

Contact Sea Tel Servicedepartment to report findings.

YesVIS1.2.5 Are there signs of loose wiring connections?

No VIS1.2.6

VIS Series 94 Troubleshooting Guide


- 4-88 -

Note: Extra harness cables that are not usedby your antenna are normally coiled up justbehind the dish. These should have a tie-wrap to secure them and prevent them fromelectrically shorting. These do not need to beconnected.

Older systems may have a loose encodercable (near the azimuth motor bracket) thatwas disconnected and is no longer beingused.

Tighten/Re-connect any other looseconnections found

Yes Contact Sea Tel Servicedepartment to report findings.

VIS1.2.6 Are there signs of any other wear or damage?Note any damage found.

No Return

Series 94 Troubleshooting Guide DRAWINGS

- 5-1 -

V Drawings

MODEL 2094 Stabilized PedestalDrawing Title117136 Installation & Operation Manual (Consumer)113629 Installation & Operation Manual (Dealer)113483 System Interconnect Diagram115136 Model 2094 General Assembly115203 Pedestal Harness Schematic 3 Axis115161 Interface Harness Assembly112479 PCU PCB Assembly112455 PCU PCB Schematic113478 Control Cable Assembly ACU to PCU114787 Shielded Control Cable Assembly ACU to PCU

MODEL 2494 Stabilized PedestalDrawing Title

117134 Installation & Operation Manual (Consumer)116680 Installation & Operation Manual (Dealer)113483 System Interconnect Diagram116086 Model 2494 General Assembly117422 Model 2494 WeSat Upgrade Kit118023 Antenna System Schematic115203 Pedestal Harness Schematic 3 Axis112479 PCU PCB Assembly112455 PCU PCB Schematic114724 Polang Aux Relay PCB Schematic113478 Control Cable Assembly ACU to PCU114787 Shielded Control Cable Assembly ACU to PCU

MODEL 3294 Stabilized PedestalDrawing Title117132 Installation & Operation Manual (Consumer)114928 Installation & Operation Manual (Dealer)113483 System Interconnect Diagram116163 System Block Diagram WeSat/DBS Dual Receive116083 Model 3294 General Assembly117694 Model 3294 General Assembly (48” Radome)

DRAWINGS Series 94 Troubleshooting Guide

- 5-2 -

118024 Antenna System Schematic115203 Pedestal Harness Schematic 3 Axis114724 Polang Aux Relay PCB Schematic112479 PCU PCB Assembly112455 PCU PCB Schematic115028 Conscan Motor Driver PCB Schematic114787 Shielded Control Cable Assembly ACU TO PCU113480 RF Cable Assembly

MODEL 4094 Stabilized PedestalDrawing Title117131 Installation & Operation Manual (Consumer)116699 Installation & Operation Manual (Dealer)113483 System Interconnect Diagram116163 System Block Diagram WeSat/DBS Dual Receive116117 Model 4094 General Assembly (48” Radome)116640 Model 4094 General Assembly (54” Radome)118024 Antenna System Schematic115203 Pedestal Harness Schematic 3 Axis114724 Polang Aux Relay PCB Schematic112479 PCU PCB Assembly112455 PCU PCB Schematic115028 Conscan Motor Driver PCB Schematic114787 Shielded Control Cable Assembly ACU TO PCU113480 RF Cable Assembly

MODEL 4894 Stabilized PedestalDrawing Title117120 Installation & Operation Manual (Consumer)115611 Installation & Operation Manual (Dealer)115613 System Block Diagram 4894116163 System Block Diagram WeSat/DBS Dual Receive115464 General Assembly Model 4894 with Conscan118024 Antenna System Schematic115203 Pedestal Harness Schematic 3 axis112479 PCU PCB Assembly112455 PCU PCB Schematic115326 Polang Relay w/ PS PCB Schematic115028 Conscan Motor Driver PCB Schematic114787 Shielded Control Cable Assembly ACU TO PCU

Series 94 Troubleshooting Guide DRAWINGS

- 5-3 -

MODEL 6094 Stabilized PedestalDrawing Title117521 Installation & Operation Manual (Dealer)117471 System Block Diagram 6094117470 General Assembly Model 6094117365 Antenna System Schematic115203 Pedestal Harness Schematic 3 axis115541 Interface Harness Assembly 6094112479 PCU PCB Assembly112455 PCU PCB Schematic115325 Polang Relay w/ PS PCB Assembly115326 Polang Relay w/ PS PCB Schematic114787 Shielded Control Cable Assembly ACU TO PCU

Radomes for DBS Antenna PedestalsDrawing Title115137 24” Radome Assembly113540 30” Radome Assembly113627 30” Radome Installation Arrangement114128 40” Radome Assembly114610 40” Radome Installation Arrangement114449 48” Radome Assembly114120 48” Radome Installation Arrangement109171 54” Radome Assembly114594 54” Radome Installation Arrangement115609 60” Radome Assembly115612 60 Inch Radome Installation Arrangement115414 72” Radome Assembly115411 72” Radome Installation Arrangement

Model TAC-92C Tracking Antenna ControllerDrawing Title

113118 Installation & Operation Manual (Dealer)113490 TAC-92C Table Top General Assembly113486 TAC-92C Table Top Chassis Wiring Diagram115755 TAC-92C Rackmount General Assembly115959 TAC-92C Rackmount Chassis Wiring Diagram113275 TAC-92C ACU PCB Assembly112226 TAC-92C ACU PCB Schematic112514 Front Panel Interconnect PCB Assembly112512 Front Panel Interconnect PCB Schematic112970 360:1 to SBS Converter PCB Assembly

DRAWINGS Series 94 Troubleshooting Guide

- 5-4 -

112969 360:1 to SBS Converter PCB Schematic114836 12 Bit S/D Converter PCB Assembly114648 12 Bit S/D Converter PCB Schematic113037 AGC Receiver Interface PCB Assembly113036 AGC Receiver Interface PCB Schematic113747 Aux Serial Port Adapter PCB Assembly113744 Aux Serial Port Adapter PCB Schematic113888 Conscan/Aux Serial Port PCB Assembly113744 Conscan/Aux Serial Port PCB Schematic116676 ACU Terminal Mounting Strip Assembly116685 ACU Terminal Mounting Strip Schematic112791 Interface Cable Diagram GPS to ACU114493 TAC-92/TAC-92C User Interface Description116670 RS-232 Cable Assembly (PCDAC Cable)

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ITEM QTY SEATEL PARTNUMBER

DRWSZ

DESCRIPTION VALUES REFERENCE / NOTES

1 1 113746 B AUX SERIAL PORT ADAPT. PCB FAB2 1 109089-41 A RESISTOR, ¼ WATT, 5% 100 ohm R143 1 109089-52 A RESISTOR, ¼ WATT, 5% 300 ohm R134 4 109089-57 A RESISTOR, ¼ WATT, 5% 470 ohm R2,R6,R7,R85 4 109089-65 A RESISTOR, ¼ WATT, 5% 1K R10,R12,R16,R176 3 109089-89 A RESISTOR, ¼ WATT, 5% 10K R1,R9,R157 1 109089-137 A RESISTOR, ¼ WATT, 5% 1 MEG R1189 2 110784-103 A CAPACITOR, MONOLYTHIC .01uF C3 (J1-1 TO J1-2)10 4 110784-104 A CAPACITOR, MONOLYTHIC .1uF C1,C2,C4,C611 1 109736-4 A CAPACITOR, ELECTROLYTIC 10uF C512 1 109736-6 A CAPACITOR, ELECTROLYTIC 100uF C71314 1 109087 A DIODE, SWITCHING 1N914 D815 3 108837-4 A DIODE, LED RED D5,D6,D716 0 108837-3 A DIODE, LED GREEN D1,D2,D3,D41718 1 110865-2 A TRANSISTOR, PNP 2N3906 Q119 1 109097-9 A I.C. SOCKET 40-PIN U120 1 112576-1 A CERAMIC RESONATOR 4.00 MHz X12122 1 110792-2 A I.C., CMOS 6805 68HC70568P U123 1 109105-2 A I.C., OPTO-ISOLATOR 4N35 U224 1 109086-8 A I.C., VOLTAGE REGULATOR LM7805 U525262728 1 110935-15 A CONNECTOR, D-SUB., PC MOUNT DE-9P J129 1 111461-10 A HEADER, .100 FRICTION LOCK 10-PIN J23031 1 109735-2 A HEADER, .100 SPACING 2 POS. D132 1 111461-3 A HEADER, .100 FRICTION LOCK 3 POS. JP333343536373839

SCALE: APPROVED BY: DRAWN BY: PGB

DATE: 3-9-95 REVISED: MF

AUX SERIAL PORT ADAPTER PCB ASSEMBLY

DOC. NO. 117030-A

SHT. 1 OF 1 DRAWING NUMBER 113747-G

PGB

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SEA TEL MODEL DAC-97USER INTERFACE DESCRIPTION VERSION 3.01

May 1998 Doc No. 114493-G

1.0 COMMAND SUMMARY (2nd Serial port commands)

CONTROL CODES: FUNCTION6 Azimuth CW one step (Not available in 3.00)4 Azimuth CCW one step "8 Elevation UP one step "2 Elevation DOWN one step "Aaaaa{} Move AZ to aaa.a deg. true or magneticBaaaa{} Set ships heading to aaa.a degreescnnnn{} Set MHz/CHA tuning to nnnn MHzdnnnn{} Set KHz/CHB tuning to nnnn KHz/MHzC Tracking (Step Track / Conscan) OND Tracking (Step Track / Conscan) OFFEeeee{} Move EL to eee.e degreesgnnn{} Set 24v polang position to nnnhnnn{} Set 5v PWM polang position to nnnnJrrrr{} Move azimuth to ship relative positionNnnn{} Set step track integral (0-255)nnnnn{} Set remote “N” parameters to NnnnnOnnn{} Output data to EME equipmentR Begin Spiral searchs Advance AGC input selection (Ext, ChA, CHB, IF)Taaaa{} Move to satellite at aaa.a degreesU Force cable unwrapW Write parameters to NV RAMXnnn{} Set azimuth step track / conscan sensitivity to nnn steps (0-255)Ynnn{} Set elevation step track / conscan sensitivity to nnn steps (0-255)$mmmmm{} NMEA Latitude / Longitude input (GPGLL format)^nnnn{} Send remote Utility command ^nnnn to PCUesc Cancel Pending Command! Enable NVRAM writes

MONITOR CODES FUNCTION TAC RESPONSEH Relative Az,Ship Heading RrrrrHaaaa CR,LF,>M Tracking Parameter Dump Xnnn Ynnn Nnnn CR,LF,>P Az/EL Position EeeeeAaaaa CR,LF,>S TAC Status Snn CR,LF,>V Software Version TAC-92C VER N.NN CR,LF,>q Read Tuning Frequencies Qnnnn nnnn s CR,LF,>u Read Temperature, polang GnnnnUuuuu CR,LF,>% Read Signal Strength Lnnnn CR,LF,>@ Report Lat / Lon Position NeeeeWaaaa CR, LF, >& Read/Clear Error Status NOT IMPLEMENTED?a{} Remote Monitor Request remote response to “a” CR

ABBREVIATIONS:eeee = Elevation angle 0000 to 0900.aaaa = True/Magnetic Azimuth 0000 to 3599 rangerrrr = Relative azimuth 0950 to 6250 rangex = ASCII hex I/O datannnn = ASCII decimal number (0000-9999)nnn = ASCII decimal number 0 to 255uuu = ASCII decimal number 0 to 999nn = System Status two ASCII words defined below:e = Error status{} = Carriage return


May 1998 Doc No. 114493-G

2.0 CONTROL CODE DETAILS

For the following descriptions, one step equals 1/24 degree for standard pedestal.

6,4 Azimuth CW,CCW one step.TAC Response: None

8,2 Elevation UP/DOWN one step.TAC Response: None

Aaaaa{} Move AZ to aaa.a degrees magnetic. May cause antenna to move more than 180degrees if shorter path will place antenna within 90 degrees of an end stop.TAC Response: CR,LF,">" when command is accepted.

Baaaa{} Set ships compass heading to aaa.a degrees. Sets Heading Valid flag (Bit 3, word 2).Resets calculated azimuth position (P command) to ships heading + azimuth relativeposition modulo 360.0 degrees. The ships heading is automatically updated by thegyro compass inputs to the ACU. Not valid for 1:1 gyro compass interface.TAC Response: CR,LF,">" when command is accepted.

C Step track ON. Sets Steptrack ON status flag (bit 3 word 1). Enables step trackmovements synchronized with "L" signal strength updates. Default state OFF.TAC Response: None.

D Step track OFF. Clears Steptrack ON status flag (bit 3 word 1). Disables tracking.TAC Response: None.

cnnnn{} Sets CHA tuning for IN A receiver or MHz tuning for IF receiver to nnnn MHz.TAC Response: CR,LF,">" when command is accepted.

dnnnn{} Sets CHB tuning for IN B receiver to nnnn MHz or KHz tuning for IF receiver to nnnKHz.TAC Response: CR,LF,">" when command is accepted.

Eeeee{} Move EL to eee.e degrees.TAC Response: CR,LF,">" when command is accepted.

gnnn{} Set 24v Polang position to nnn. For 24v polang systems 30 to 210 corresponds toapproximately -90 to +90 degrees from vertical. For flip antenna systems, 000corresponds to the flat plate array, 128 corresponds to the horn antenna.TAC Response: CR,LF,> when command is accepted.

hnnn{} Set 5v PWM Polang position to nnn. For 5v polang systems 50 to 200 corresponds toa probe angle of approximately -90 to +90 degrees from vertical.TAC Response: CR,FL,> when command is accepted.

Jrrrr{} Move azimuth to ship relative position. Azimuth stabilization, Unwrap and andTracking mode remain active after a J command.TAC Response: CR,LF,">" when command is accepted.


May 1998 Doc No. 114493-G

Nnnn{} Set number of signal strength updates to accumulate for each trial step for step trackoperation. "N" should be set for a 2-6 second step track interval. Allowable range is 0to 255. A setting of 0 disables step track and enables Conscan.TAC Response: CR,LF,">" when command is accepted.

nnnnn{} Sets Remote PCU parameters to Nnnnn. Used to set pedestal system type, adjustindividual axis gains and set reference offsets.TAC Response: CR,LF,">" when command is accepted.

Onnn{} Output data to EME equipment. Changes logic state of output lines DO0-DO3. Data issent as ASCII hexadecimal. Allowable range of nnn "0" to "7"TAC Response: CR,LF,">" when command is accepted.

R Starts two axis spiral search pattern for satellite (SEARCH2). Sets Searching statusflag (bit 0, word 2) and Steptrack ON status flag (bit 3 word 1). Search pattern size andincrement is pre-set by the TAC-92 Setup parameters. Search is terminated by signallevel above threshold, end of search pattern or a new Az or EL position command. Ifno signal is found then antenna is returned to its original azimuth and elevationposition.TAC Response: None

s Advance AGC input selection by one. Selection of External, RF in A, RF in B or IFreceivers corresponds to an "s" value of 0, 1, 2 or 3 respectively. The current "s" valueis reported by the "q" Monitor Code.TAC Response: none

W Write all setup parameters to NV RAM.TAC Response: None

Xnnn{} Set azimuth step track size or conscan sensitivity to nnn steps. Allowable range is 0 to255. The maximum conscan sensitivity setting is 0. Increasing the conscan setting byone decreases the system sensitivity by a factor of 2.TAC Response: CR,LF,">" when command is accepted.

Ynnn{} Set elevation step track size or conscan sensitivity to nnn steps. Allowable range is 0 -255 steps. Setting "Y" to zero disables elevation step track doubling the speed of theazimuth step track. See Xnnn setting for conscan information.TAC Response: CR,LF,">" when command is accepted.

$mmmmm{} NMEA Latitude / Longitude input. Sentence format as follows:GPGLL,YYYY.YY,N,XXXXX.XX,W (,UTC optional) YYYY.YY = Latitude in Degrees,Minutes, Decimal minutesN = North, S = South Latitude XXXXX.XX = Longitude inDegrees, Minutes, Dec Minutes E = East, W = West Longitude


May 1998 Doc No. 114493-G

3.0 MONITOR CODE DETAILS

H Relative AZ / Ships Heading position report. Reports simultaneous value of AntennaRelative position and Ships heading position in tenths of degrees. Relative azimuthrange is 0950 to 6250. Ships heading range is 0000 3599.TAC Response: "RrrrrHaaaa",CR,LF,">"

M Not implemented in this version.Parameter Dump. Response is one line of ASCII characters representing the X,Y andN step track parameters.TAC Response: "Xnnn Ynnn Nnnn",CR,LF,">"

P Az/EL Position. Response is one line of ASCII characters representing the antennaelevation and true azimuth position in tenths of a degree. Elevation range is 0000 to0900. Azimuth range is 0000 to 3599.TAC Response: "EeeeeAaaaa",CR,LF,">"

S TAC Status. Response is two ASCII characters representing the system statusaccording to the following table. This command can be issued at any time and is notlocked out by pending I/O commands.TAC Response: "Snn",CR,LF,">" nn Status Words:

WORD1 WORD 2Bit 0 = Remote Alarm Bit 0 Bit 0 = SearchingBit 1 = Remote Alarm Bit 1 Bit 1 = InitializingBit 2 = Unwrap in progress Bit 2 = Error DetectedBit 3 = Steptrack On Bit 3 = Heading ValidBit 4 = spare Bit 4 = Elevation targetingBit 5 = Auto Unwrap On Bit 5 = Azimuth targetingBit 6 = 1 Bit 6 = 1Bit 7 = 0 Bit 7 = 0

V Software Version. Response is ASCII string defining software model and versionnumber.TAC Response: "TAC-92 VER N.NN",CR,LF,">"

q Tuning Frequency. Response is Channel A tuning, Channel B tuning and receiverselection. For IF receiver selection, response is MHz portion , KHz portion of thetuning frequency and receiver selection. Receiver selection of External, RF in A, RF inB or IF receivers corresponds to an "s" value of 0, 1, 2 or 3 respectively.TAC Response: "Qnnnn nnnn s",CR,LF,">"

u Polang / AUX read. Response is polang position (nnnn) and Auxiliary A/D reading(uuuu) from remote PCU. Reads polang pot for 24 volt polang systems and polangPWM output for 5v systems. For flip antenna systems, 000 indicates primary antenna,128 indicates secondary antenna. Aux A/D reading is 0000-4095 for 0 to 5v input. IfAux Read is temperature, Degrees C = 2.0 + .032 x uuuu - 3271 / uuuu.TAC Response: "GnnnnUuuuu",CR,LF,">"

% Signal Strength. Response is average signal strength over N sample intervals in ASCIIhex characters. Allowable range of response is 0000 to FFFF.TAC Response: "Lssss",CR,LF,">"


May 1998 Doc No. 114493-G

@ Latitude / Longitude Position Read. Reports North/South Latitude and East/WestLongitude read from GPS receiver in tenths of a degree.TAC Response: “NeeeeWaaaa”,CR,LF,”>“

?a{} Request Remote Status. Sends the “a” Status Request command to the PCU andechoes the PCU response less checksums. ?S{} gets PCU status, ?V{} gets PCUVersion Number.TAC Response “PCU status response” + CR,LF,”>”.

4.0 GENERAL NOTES

The CR,LF,">" echo indicates that the TAC has accepted a command and is ready to process the nextcommand. Any additional commands will not be accepted until after the TAC echoes CR,LF,">".

The normal command latency for Monitor or Control commands is 25 mili Seconds.

Temperature in degrees C = 2.0 + .032 x uuuu - 3271 /uuuu.

CDC

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JP

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Sea TelMarine Stab i l i z ed Antenna Sys t ems

February 17, 1999 Document No. 117422-0

Model 2494 Wesat UpgradeAssembly Instructions

1. Remove existing Interface Harness Assembly. Begin by removing connections atradome base connector bracket (see Detail ‘C’ of drawing). Disassemble 9-pin circularconnector and remove pins. Disconnect the (2) existing ‘F’ connectors. Remove thespooler top, cut the cable tie that attaches the harness to the standoff, and carefully pullthe harness up through the spooler. Remove cable clamps (to be reused) along harnessrouting until the reflector is reached. Disconnect harness at feed and pull wires throughthe grommet in the reflector.

2. Replace existing feed assembly with new Wesat feed assembly (item 1). Remove feedstrut mounting clip hardware to disconnect feed and use existing hardware to mount theWesat feed assembly.

3. Install Geostationary LNA (item 2) on LNA mounting bracket (item 3) using (2) 6-32 x ½”PH Pan Head Screws (item 7) as per drawing.

4. Remove the feed strut screw just underneath location of reflector braces and two of thefour antenna mounting screws on the elevation pan stiffener. Use this hardware tofasten the LNA mounting bracket (item 3) to the back of the antenna.

5. Route the free end of the supplied Interface Harness Assembly through the top of thespooler and terminate cables at connector bracket in the base of the radome (see Detail‘C’ of drawing). Add ‘F’ bullet (item 6) at location shown on drawing for Wesatconnection. Insert pins into the 9-pin circular connector as shown in Detail ‘C’ of drawingand secure to connector bracket. Fasten a cable tie around the harness and standoff atthe top of the spooler. Rotate the pedestal counterclockwise to the left stop and provideadequate slack in the harness as shown in Detail ‘A’ of the drawing. Feed the harnessthrough the cable clamp located directly behind the opening in the spooler top (seedrawing) and fasten a cable tie on both sides of the cable clamp. Verify that the harnessis wound according to Detail ‘B’ of the drawing when the pedestal is rotated clockwise tothe right stop. Adjust the amount of slack in the harness at the cable clamp location asnecessary. Replace the spooler top and continue to route the harness as shown on thedrawing through all cable clamps until you reach the reflector. Route the (2) longest ‘F’male cables through the grommet in the reflector and terminate at the feed. Theshortest ‘F’ male cable is to be terminated at the Geostationary LNA connector labeled‘receiver’.

6. Install the N(male) to SMA(male) cable (item 4) from the Geostationary LNA (item 2)connector labeled “antenna” to the Wesat dome located at the feed (item 1). Followcable routing as shown on the drawing included. Use the supplied cable ties (item 8) tofasten the cable to the unit and remember to allow clearance for sufficient feed rotation.

7. Apply cable ties (item 8) as necessary to secure Interface Harness.


DRWSZ

DESCRIPTION MANUFACTURER’S SPECIFICATIONS

1 1 114978 D BASE SPINDLE ASSEMBLY2 1 114979 C CROSS LEVEL / POST ASSEMBLY3 1 114392 C LEVEL BEAM ASSEMBLY4 1 114375 C ELEVATION PAN ASSEMBLY5 1 114226-1 C LEVEL PLATFORM ASSEMBLY (REF. ITEM 4)6 1 115414-4 C 72” RADOME ASSEMBLY7 1 113873-1 B PCU ENCLOSURE ASSEMBLY (REF. ITEM 1)8 1 114180-1 B TRAIN MOTOR ASSEMBLY (REF. ITEM 1)9 1 117517 A C-BAND VERTEX FEED ASSEMBLY (C.F.E.)10 1 110486-3 B 1.5M – 5FT REFLECTOR MACHINING11 1 117560-1 B LNB MOUNTING PLATE ASSEMBLY (-1 ASS’Y ONLY)11 1 117560-2 B LNB MOUNTING PLATE ASSEMBLY (-2 ASS’Y ONLY)12 1 114540 B PRO-II C-BAND DIGI-READY LNB (REF. ITEM 11)13 1 110256-2 B C-BAND BANDPASS FILTER (REF. ITEM 11)14 1 117343-1 A WGA-229 WAVEGUIDE ADAPTER (REF. ITEM 11)15 1 114450-2 A RF COAX. SWITCH (REF. ITEM 11)(-2 ASS’Y ONLY)16 1 117570-1 B REFLECTOR BRACE (LEFT)17 1 117570-2 B REFLECTOR BRACE (RIGHT)18 1 113605 A REFLECTOR CROSS BRACE19 34 109270 A REFLECTOR CLIP WASHER20 2 112467-8 A STANDOFF (.25” O.D. x #6 x .18” L.)21 1 115325-1 B POL. AUX. RELAY W/PS PCB ASS’Y22 4 108885-27 A EQUIPMENT STANDOFF (.50” O.D. x .26” I.D. x .50” L.)23 2 SCREW, PH PHD 6-32 x 3/8”, S.S.24 2 SCREW, PH PHD 6-32 x ½”, S.S.25 4 WASHER, FLAT No. 6, S.S.26 2 NUT, HX 6-32, S.S.2728 1 SCREW, PH PHD 10-32 x 1-1/8”, S.S.29 8 SCREW, PH PHD 10-32 x 5/8”, S.S.30 8 SCREW, PH FLAT HD 10-32 x ¾”, S.S.31 6 SCREW, PH PHD 10-32 x 7/8”, S.S.32 33 WASHER, FLAT No. 10, S.S.33 17 NUT, HX 10-32, S.S.34 4 SCREW, HX HD ¼-20 x 5/8”, S.S.35 8 WASHER, FLAT ¼”, S.S.36 4 NUT, HX ¼”, S.S.37 4 SCREW, HX HD 5/8-11 x 1-3/4”, S.S.38 8 WASHER, FLAT 5/8”, S.S.

Sea Tel SCALE: NONE DRAWN BY: MAB

DATE: 3-31-99

APPROVED BY:

REVISED: MAB

GENERAL ASSEMBLY – MODEL 6094-1, -2

-1 W/O COAX SWITCH

-2 W/COAX SWITCH

DOC. NO. 117030-ASHT. 1 OF 2

DRAWING NUMBER 117470-A


DRWSZ


39 4 WASHER, LOCK 5/8”, S.S.40 4 NUT, HX 5/8”, S.S.41 3 114662-318 A STANDOFF (.38” O.D. x .20” I.D. x .50” L.)42 1 117766 B ELEVATION COUNTER WEIGHT ASS’Y (NOT SHOWN)43 1 115541-3 C INTERFACE HARNESS ASSEMBLY (NOT SHOWN)44 1 115868-4 C PEDESTAL HARNESS ASSEMBLY (NOT SHOWN)45464748495051525354555657585960616263646566676869707172737475767778798081828384

MODEL: 6094-1, -2 SHT. 2DRAWING NUMBER

117470-A


DRWSZ


1 1 117470-1 D GENERAL ASSEMBLY – MODEL 6094-1 (-1 ASS’Y ONLY)1 1 117470-2 D GENERAL ASSEMBLY – MODEL 6094-2 (-2 ASS’Y ONLY)2 1 117517 A C-BAND VERTEX FEED ASSEMBLY (C.F.E.)(REF. ITEM 1)3 1 110486-3 A 1.5M REFLECTOR MACHINING (REF. ITEM 1)4 1 114450-2 A RF COAX. SWITCH (REF. ITEMS 1 & 21)(-2 ASS’Y ONLY)5 1 113873-1 B PCU ENCLOSURE ASSEMBLY (REF. ITEM 1)6 1 115325-1 B POLANG AUX. RELAY W/PS PCB ASS’Y (REF. ITEM 1)7 1 117343-1 C WR-229 COAX ADAPTER (REF. ITEMS 1 & 21)8 1 110256-2 B C-BAND BANDPASS FILTER (REF. ITEMS 1 & 21)9 1 114540 B C-BAND DIGITAL LNB (REF. ITEMS 1 & 21)10 1 115541-3 C INTERFACE HARNESS ASSEMBLY (REF. ITEM 1)11 1 115868-4 C PEDESTAL HARNESS ASSEMBLY (REF. ITEM 1)12 1 115755-1 D TAC-92C RACKMOUNT GENERAL ASS’Y13 1 116676 B TERMINAL MOUNTING STRIP ASS’Y14 1 110293-4 A 4-WAY COAX SPLITTER15 1 113480-1 A RF CABLE ASSEMBLY (50 ft.)16 1 114787 B SHIELDED CONTROL CABLE ASS’Y17 2 109391 A ‘F’ BULLET18 1 115198 A CONNECTOR BRACKET19 1 116670 B RS-232 CABLE ASSEMBLY (REF. W/O)20 1 113189-1 B GPS ANTENNA INSTALLATION KIT (REF. W/O)21 1 117560-1 B LNB MOUNTING PLATE ASSEMBLY (-1 ASS’Y ONLY)21 1 117560-2 B LNB MOUNTING PLATE ASSEMBLY (-2 ASS’Y ONLY)22232425262728293031323334353637

Sea Tel SCALE: DRAWN BY: MAB

DATE: 3-16-99

APPROVED BY:

REVISED: MAB

SYSTEM BLOCK DIAGRAM

-1 W/O COAX SWITCH

-2 W/ COAX SWITCH

DOC. NO. 117030-A

MODEL: 6094-1, -2 SHT. 1 OF 1 DRAWING NUMBER 117471-A

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