figures - r-390a · 2009-08-09 · 5.2 maintenance turn-on procedure 5-5 5.3 relays, lamps, and...
TRANSCRIPT
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-1 Chapter 5 Troubleshooting
Edited 7/09: No Technical Changes
Chapter 5 - Troubleshooting Page Table Of Contents 5-1
5.1 Introduction 5-3 5.2 Maintenance Turn-On Procedure 5-5 5.3 Relays, Lamps, and Overload Devices 5-8 5.4 Troubleshooting Information 5-9 5.5 Trouble Isolation Procedures. 5-11 5.6 Zoning For Schematic Diagrams Figures 5-18 Thru Figures 5-24 5-46
Figures Figure 5-1 Terminal Numbers of RF and Variable IF Coils 5-13 Figure 5-2 Fabrication of Coaxial test Cables 5-14 Figure 5-3 Fabrication of Multi-conductor Test Cables 5-15 Figure 5-4 RF Sub-chassis, Voltage and Resistance Diagram 5-16 Figure 5-5 Crystal Oscillator Sub-chassis, Voltage Resistance Diagram 5-17 Figure 5-6 IF Sub-chassis, Voltage and Resistance Diagram 5-18 Figure 5-7 VFO Sub-chassis. Voltage and Resistance Diagram 5-19 Figure 5-8 AF Sub-chassis, Voltage and Resistance Diagram 5-20 Figure 5-9 Power Supply Sub-chassis, Voltage and Resistance Diagram 5-21 Figure 5-10 IF and AF Sub-chassis Resistor and Capacitor Terminal Boards, Diagram 5-22 Figure 5-11 Power Distribution Diagram 5-32 Figure 5-12 Filament and Oven Circuits 5-33 Figure 5-13 Field Changes 5-34 Figure 5-14 Signal Flow Diagram, Part 1 of 4 - RF Stage 5-35 Figure 5-15 Signal Flow Diagram, Part 2 of 4 - Mixer Stages 5-36 Figure 5-16 Signal Flow Diagram, Part 3 of 4 - IF Stages 5-37 Figure 5-17 Signal Flow Diagram, Part 4 of 4 - Audio Stages 5-38 Figure 5-18 Schematic Diagram, Part 1 of 7 - RF Amplifier 5-39 Figure 5-19 Schematic Diagram, Part 2 of 7 - 1st Mixer and 1st Crystal Oscillator 5-40 Figure 5-20 Schematic Diagram, Part 3 of 7 - 2nd Mixer and VFO 5-41 Figure 5-21 Schematic Diagram, Part 4 of 7 - 2nd Crystal Oscillator 5-42 Figure 5-22 Schematic Diagram, Part 5 of 7 - IF Amplifiers, AGC, Limiter and Detector 5-43 Figure 5-23 Schematic Diagram, Part 6 of 7 - Line and Local Audio Amplifiers. 5-44 Figure 5-24 Schematic Diagram, Part 7 of 7 - Power Supply 5-45 Figure 5-25 Power Distribution Levels 5-46
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-2 Chapter 5 Troubleshooting
Tables Table 5-1 Troubleshooting Index 5-4 Table 5-2 Maintenance Turn-On Procedure 5-5 Table 5-3 Relays, Lamps, and Overload Devices 5-8 Table 5-4 Test Cable Data 5-12 Table 5-5 Trouble Isolation 5-23 Table 5-6 Transformer and Coil Resistances 5-28 Table 5-7 Connector Resistance Measurements 5-30 Table 5-8 Schematic Component Location Zones. 5-46
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July 2009 Page 5-3 Chapter 5 Troubleshooting
5.1 Introduction 5.1.1 Troubleshooting is a logical procedure used to locate a fault in equipment. The procedure given here is based on knowledge of electronic fundamentals, a thorough understanding of the radio receiver, and the application of information contained in this handbook. 5.1.2 One step in troubleshooting, symptom recognition, depends upon experience with equipment operating characteristics. Daily observation of the normal operation of the receiver helps one to recognize an abnormal condition if it should occur. 5.1.3 A second step, symptom elaboration, calls for the use of front panel controls, meters, and output devices to obtain better identification of the trouble. The maintenance turn-on procedure can be used to advantage in this step. 5.1.4 Following this, a logical decision can be made to select the most likely function responsible for the faulty operation. Here the over-all functional description (para 3.1) and its associated block diagram can be used as an aid. 5.1.5 Tests must then be made to determine whether the chosen function is the faulty one. The signal flow diagram is used in this step to find appropriate test points. Key steps in the trouble isolation tables provide normal indications as an aid in these tests and measurements. 5.1.6 When trouble is found in a certain function, it must be localized to a circuit and then a detail part. This is accomplished by following step-by-step procedures in the trouble isolation tables. Again, the signal flow diagram is useful, especially when supplemented by schematic diagrams and voltage and resistance charts. Functional and circuit descriptions should also be consulted. 5.1.7 Assuming that a faulty circuit and part is found, a review of the situation is in order, to determine whether the part is the cause of the trouble or that some other malfunction has caused the part to become defective. 5.1.8 General references were made above to a number of troubleshooting aids. More specific paragraph references are given in table 5-1 as they pertain to the individual subassemblies.
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-4 Chapter 5 Troubleshooting
Table 5-1 - Troubleshooting Index
Sub-Assembly
Voltage & Resistance (Fig. No.)
Parts Location (Fig. No.)
Adjustment
Remove & Replace
(Para. No.) (Para. No.) (Fig. No.)
AF 5-8, 5-10
6-27, 6-28
- - 6.3.14
Crystal Oscillator
5-5 6-5, 6-12, 6-23, 6-22, 6-24
6.2.9 6-5 6.3.7, 6.3.8
IF 5-6, 5-10
6-5, 6-16, 6-17, 6-18
6.2.7, 6.2.8, 6.2.13, 6.2.15, 6.2.17
6-5 6.3.9, 6.3.10
Mainframe - 6-9,
6-14, 6-15, 6-32
- - 6.3.2, 6.3.15
Mechanical - 6-1,
6-4, 6-3, 6-8, 6-36
6.2.5, 6.2.6, 6.2.18
6-2, 6-13
6.3.16 through 6.3.19
Power supply 5-9 6-29,
6-30 - - 6.3.13
RF 5-4 6-19,
6-20, 6-21
6.2.10, 6.2.11, 6.2.12, 6.2.14
5-1, 6-6
6.3.3 through
6.3.6
VFO 5-7 6-25,
6-26 6.2.16 6-7 6.3.11,
6.3.12
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-5 Chapter 5 Troubleshooting
5.2 Maintenance Turn-On Procedure 5.2.1 The maintenance turn-on procedure (table 5-2) is a step-by-step procedure to be used by maintenance personnel in bringing the equipment to an operating condition from a completely secured condition. Normal conditions are noted along with steps to be followed and reference paragraphs to be used if indications are abnormal, 5.2.2 If dial lamps fail to light, check the AC input fuse F101 and the AC input connections. Measure the AC Input voltage (see table 1-2). Check the 6.3 volt circuits (figures 5-11 and 5-12). If no signal is heard, proceed with next step in table 5-2. 5.2.3 If at least one band is normal, make receiver RF-IF checks on faulty bands beginning with step 8 of table 5-5. If all bands are abnormal, begin at step 1 of table 5-5. 5.2.4 AGC circuits could be faulty. Perform steps 17, 18 and 19 of table 5-5. 5.2.5 Check RF input circuits, figure 5-18, zone C. 5.2.6 Perform steps 4 and 5 of table 5-5.
Table 5-2 Maintenance Turn-On Procedure
Prior Control Settings:
AUDIO RESPONSE switch: Wide
BANDWIDTH switch: 8 KC
RF GAIN control: 10
LIMITER control: OFF
LOCAL GAIN control: 6
ANTENNA: connected
Loudspeaker or Headphones connected
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July 2009 Page 5-6 Chapter 5 Troubleshooting
Table 5-2 Maintenance Turn-On Procedure - Continued
Step Action Or Condition Normal Indication
1 Turn FUNCTION switch to AGC. Dial lamps light. Rushing noise or signal heard in speaker or headset.
5.2.2
2 Set MEGACYCLE CHANGE control at each band in turn.
Normal signal output on each band. 5.2.3
3 Tune KILOCYCLE CHANGE control across any band and then to one signal.
CARRIER LEVEL meter indicates strength of received signals.
5.2.4
4 Rotate ANT TRIM control. Obtain peak indication on CARRIER LEVEL meter for each band.
5.2.5
5 Rotate LOCAL GAIN control in either direction.
Volume at loudspeaker or headset increases or decreases.
5.2.6
6 Rotate LINE GAIN control in either direction,
LINE LEVEL meter indication increases or decreases.
5.2.7
7 Rotate RF GAIN control in either direction.
Audio output and CARRIER LEVEL meter indication increase or decrease.
5.2.8
8 With receiver tuned away from any signal turn FUNCTION switch to MGC.
Noise level should increase slightly and CARRIER LEVEL should not indicate.
5.2.9
9 Turn FUNCTION switch to AGC and tune KILOCYCLE CHANGE control through several different signals.
Output volume nearly constant. 5.2.10
10 Turn FUNCTION switch to CAL and tune KILOCYCLE CHANGE control.
Deflection of at least 40 dB on CARRIER LEVEL meter at each 100 kHz reading.
5.2.11
11 Turn LIMITER fully clockwise. Noise peaks are reduced in amplitude; audio distortion increases.
5.2.12
12* Turn BREAK IN relay switch to ON and short BRK IN terminal 9 on rear panel to ground momentarily.
Break-in relay functions to silence receiver.
5.2.13
13 Turn LINE METER switch to 0 and adjust LINE GAIN control for a meter indication at VU mark.
Meter adjusts to VU mark (0 dB). 5.2.14
14 Turn LINE METER switch to +10. LINE LEVEL meter indicates -10. 5.2.15
15 Turn LINE METER switch to -10. Meter indicates off scale to right. 5.2.15
16 Turn LINE METER switch to OFF. No indication on LINE LEVEL meter. 5.2.15
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July 2009 Page 5-7 Chapter 5 Troubleshooting
Table 5-2 Maintenance Turn-On Procedure - Continued
Step Action Or Condition Normal Indication
17 Turn BFO control to ON, tune in a CW signal and vary the BFO PITCH control.
Beat note of signal is audible and varies. 5.2.16
18 Turn BANDWIDTH switch from 16 kHz to 0.1 kHz.
Selectivity becomes sharper and noise decreases. Only low frequency tones are heard in the counterclockwise positions.
5.2.17
19 Operate AUDIO RESPONSE switch through both positions.
Permits amplification of full AF range in WIDE position and 800 Hz in SHARP position.
5.2.18
*For Shore Stations only. 5.2.6 Perform step 4 of table 5-5. 5.2.7 Perform step 4 of table 5-5. 5.2.8 Check cathode bias line, figure 5-14, zone D and figure 5-16, Zone A. 5.2.9 Check MGC switching circuit, figure 5-16, zone B. 5.2.10 Perform AGC circuit tests given in steps 17, 18 and 19 of table 5-5. 5.2.11 Perform calibration oscillator tests given in steps 20, 21 and 22 of table 5-5. 5.2.12 Check limiter circuit, figure 5-16, zone D or perform step 6 of table 5-5. 5.2.13 Check break-in relay circuits shown in figure 5-14, zone A and figure 5-15, zone C. 5.2.14 Perform line AF amplifier tests given in step 6 of table 5-5. 5.2.15 Check line meter switching circuits shown in figure 5-23, zone D. 5.2.16 Check BFO circuit shown in figure 5-16, zone D. 5.2.17 Check IF filter circuits shown in figure 5-16, zone B. 5.2.18 Check AF filter circuits shown in figure 5-17, zone A.
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July 2009 Page 5-8 Chapter 5 Troubleshooting
5.3 Relays, Lamps and Overload Devices
Table 5-3 - Relays, Lamps, and Overload Devices Reference
Designation Functional Name
Of Item Or Circuit Energizing Voltage
And/Or Rating Figure
Reference
Relays
K 101
K 601
Antenna relay
Break-in-relay
24 VDC.
6.3VDC.
5-11, 5-14 5-11, 5-14, 5-17
Lamps
I 101
I 102
I 103
Pilot lamp
Pilot lamp
Antenna overload
6V. 0.20 amp
6V. 0.20 amp
65V. 1/4 watt
5-12
5-12
5-19
Fuses
F l0l AC Input fuse With 115V input:
3 amp (Ovens switch On)
2 amp (Ovens switch Off)
With 230V input:
1-1/2 amp (Ovens switch On)
1 amp (Ovens switch Off)
5-11
F 102
F 103
Main B+ line
RF - IF B+ line
1/4 amp
1/8 amp
5-11
5-11
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-9 Chapter 5 Troubleshooting
5.4 Troubleshooting Information 5.4.1 Troubleshooting efficiency can be improved through the knowledge and intelligent use of the many aids available to the technician. For example, the R-390A/URR Receiver is equipped with a number of built-in features which can be used to advantage in troubleshooting. These features will be discussed here along with other suggestions concerning good practices for detecting and locating trouble. 5.4.2 Visual Inspection. The importance of performing a careful visual inspection before launching into functional or detailed troubleshooting is often overlooked. Some suggestions, which can be enlarged upon by an observant technician, are given in table 5-3. 5.4.2.1 Visual inspection can be broken down into external and internal areas of inspection. External inspection includes power and signal input connections, rear terminal board linkages, and output signal connections.
1. Check the input power connector, the fuses and fuse holders. See table 2-3 for proper fuse ratings.
2. Inspect the antenna input connections. 3. Inspect the audio output connections and phone jack. 4. Check the jumpers on the rear panel terminal boards which provide audio and AGC linkages. 5. Check for loose or missing knobs, or damage to meters.
5.4.2.2 Internal inspection concerns tubes and connectors
1. See that tubes are unbroken, are properly seated in their sockets and are equipped with tube shields where applicable.
2. Observe that all subassemblies are securely fastened and completely interconnected. 3. Look for any evidence of overheated components or charred or frayed insulation.
5.4.3 Built-In Troubleshooting Aids. The built-in features of the equipment which aid the maintenance man include the following: carrier level meter, line level meter, and calibration oscillator. The output transducers, phones or speaker, can also be used as sensing devices for the detection of trouble. The CARRIER LEVEL meter measures the relative signal strength of the incoming RF or test signals. Indications on this meter are proportional to those at the AGC terminals on the rear panel of the receiver. The LINE LEVEL meter readings can be translated into audio output or power ratio readings. The LINE METER switch extends the range of the LINE LEVEL meter over a 40-dB range.
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-10 Chapter 5 Troubleshooting
5.4.3.1 The calibration oscillator, while designed primarily for calibration checks can also be used in conjunction with the CARRIER LEVEL meter for rough sensitivity checks across the entire frequency range (refer to table 5-2, step 10). The phones or speaker can also be used for rough sensitivity checks by listening to the relative signal or noise levels. Then too, other faults such as excessive hum, noise, or interference, or intermittent conditions can be detected by this means. 5.4.3.2 These built-in features can be used to advantage by performing the maintenance turn-on-procedures (table 5.2) and making the appropriate observations. Duh, REALLY? 5.4.4 Trouble Isolation. Physically, the equipment consists of a main frame and six sub-chassis as listed in table 5-1. Functionally, the receiver can be divided into four subsystems, namely, the power supply, the AF, the IF, and the RF circuits. The trouble isolation table (5-5) is based on this functional approach, and tests are arranged in the order named above. 5.4.4.1 Steps 1, 2 and 3 are concerned with power supply tests, since this function is common to and required by the other three functions. Steps 4 through 7 concern the audio circuits. Steps 4 and 5 check out the over-all audio function. Steps 6 and 7 are entered only if there is audio trouble; they are stage-by-stage checks that progress from output to input. Steps 8 and 9 concern, the IF circuits. Step 8 checks out the overall IF function. Step 9 is a stage-by-stage check, that progresses from the detector back to the RF circuits. Steps 10 through 16 are stage-by-stage RF circuit checks which lead back from the third mixer to the antenna. 5.4.4.2 The RF function includes several local oscillators which, since they are internal signal generators, can be checked independently as described in paragraph 5.5.3. In addition, AGC circuits are checked in steps 17, 18 and 19, and calibration oscillator circuits are checked in steps 20, 21 and 22. 5.4.5 Sub-chassis Removal for Troubleshooting.
Caution: Do not attempt removal or replacement of parts or sub-chassis before reading the instructions in paragraph 6.3.1 through 6.3.1.3.
5.4.5.1 When testing or troubleshooting the receiver, do not remove a sub-chassis unless it is absolutely necessary. Test cables are required for operating a sub-chassis out of the receiver (para 5.5.1). If a receiver in good operating condition is available, a sub-chassis may be connected from it, directly into the receiver being repaired.
Note: Avoid disturbing the synchronization of the RF gear train assembly with the RF, crystal oscillator, or VFO sub-chassis.
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-11 Chapter 5 Troubleshooting
5.4.5.2 To avoid removing a sub-chassis when voltage is to be measured or when a signal is to be injected at a tube-socket pin that does not have a test point, remove the tube and use a tube adapter with test points. The RF tuning coils and transformers on the RF sub-chassis can be removed readily (para. 6.3.4.3), if necessary, to permit measurement of voltage or resistance at the socket contacts, or measurement of the voltage or resistance at the socket contacts, or measurement of the continuity of the coils. If trouble is suspected in the RF sub-chassis, perform as much detailed troubleshooting as possible before removing it to be sure that the trouble is in the sub-chassis, since removal and replacement of this sub-chassis is time-consuming. 5.4.5.3 Figure 5-1 shows the numbers of the terminals on the RF and the variable IF coils as seen from the bottom of the RF sub-chassis. These numbers are used to identify the terminals in the schematic diagrams in this manual.
Table 5-4 - Test Cable Data
From Plug No. Cable Type To Jack No. Co-axial Test Cables P717 RG-187/U J217
P215 RG-187/U J415 P207 RG-187/U J107 P206 RG-187/U J106 P205 RG-187/U J105 P218 RG-187/U J518 P213 RG-187/U J513
Multi-Conductor Test Cables P108 J208 P109 All shielded and J709 P110 unshielded wires to be J410 P111 no smaller than 18 J811 P112 gauge stranded wire. J512 P119 Refer to figure 5-3. J619 P120 J620
5.5 Trouble Isolation Procedures 5.5.1 Test Cable Data (See figures 5-2 and 5-3). Test cables are required when operating sub-chassis out of the receiver. Make all cables 24 inches long. Table 5-4 contains plug and jack reference designations for each test cable required.
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-12 Chapter 5 Troubleshooting
5.5.2 Initial Control Settings. Use the control settings given below before performing any test or troubleshooting procedure. Many of the tests that follow repeat some of these settings, and others refer back to this paragraph to stress the importance of using the proper control settings. Observe these control settings, and change them only when instructions in a particular procedure direct different control settings. LINE METER OFF ANT TRIM 0, or maximum output
LINE GAIN 0 BFO OFF
AGC MED DIAL LOCK Unlocked, fully counterclockwise
LIMITER OFF ZERO ADJ Disengaged, fully counterclockwise
AUDIO RESPONSE WIDE LOCAL GAIN 10, or desired volume
BANDWIDTH 8 OVENS OFF
BFO PITCH 0 MEGACYCLE CHANGE 01, or as specified
BREAK IN OFF KILOCYCLE CHANGE 510, or as specified
FUNCTION MGC RF GAIN 10 5.5.3 Oscillator Injection Voltage Tests (See figures 5-18 through 5-24.) To check the conversion oscillators (V207, V401, and V701) to see if they are oscillating, turn the FUNCTION switch to STANDBY to remove B+ from all tubes except the conversion oscillators. The cathodes and control grids of the mixers act as rectifiers of the oscillator voltage at test points E209, E210, and E211. The voltage at test point E402 (figure 5-21) is the grid leak bias at the control grid of V401 5.5.3.1 Check the DC voltage at test points E209, E210, E211, and E402 with Electronic Multi-meter USM-116. ( ) The voltage should be as follows:
Test Point Voltage
*E209 -4.0 to -6.8
E210 -3.0 to -8.0
E211 -1.3 to -4.3 (-0.95 to -1.6 with FC-7)
E402 -4 to -11
*To obtain a meter indication at test point E209, the receiver must be tuned below 8 MHz
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-13 Chapter 5 Troubleshooting
T2013
T202 T203 T204 T205 T206
4 5
6 3
12 12
3
12
54
63
4 5
6
1212
63
544 5
6
12
54
63
Z201-1 Z202-1 Z203-1 Z204-1 Z205-1 Z206-13 1 3 113 133 1 3 1
Z201-2 Z202-2 Z203-2 Z204-2 Z205-2 Z206-2
2
3 1 13
2
3 1
2
3 1
2
3 1
2 2
13
T207 Z216-1
Z216-2
Z216-3 Z213-1
Z213-2
Z213-3
T208
1
3
1
3
1
3
1
1 2
5 3
4
3
1
3
1
3
2 3
1 4
Rev: 12/03/99
DWG BY KH6GRT
Figure 5-1 Terminal Numbers of RF and Variable IF Coils1
1Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-14 Chapter 5 Troubleshooting
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DU
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.
3. I
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INSU
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R B
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R C
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DU
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EN
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TAC
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TAC
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TAC
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4. I
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NU
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TO J
AC
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RO
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CLA
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NU
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WH
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AC
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PA
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MO
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IT IS
NEC
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OU
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FRO
NT
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THR
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AN
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NSE
RT
SPA
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(IF
REQ
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ED) A
ND
LOC
K W
ASH
ER A
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TH
REA
D O
N H
EX C
OU
PLIN
GB
EFO
RE
INSE
RTI
NG
CA
BLE
ASS
EMB
LY.
CA
BLE
TER
MIN
ATI
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: ASS
EMB
LY IN
STR
UC
TIO
NS
FOR
CA
BLE
TER
MIN
ATI
ON
S A
RE
IDEN
TIC
AL
WIT
H T
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SE G
IVEN
INST
EPS
1 A
ND
2 F
OR
STR
AIG
HT
PLU
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EXC
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DIM
ENSI
ON
SFO
R C
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CA
BLE
DIE
LEC
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R C
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DU
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AL.
0-1/
327 64
11 64
TIN
INSU
LATO
RB
USH
ING
CO
NTA
CT
0-1/
323 32
3 32
TIN
Rev
: 12
/08/
99
DW
G B
Y K
H6G
RT
1 32
TIN
5 64
0-1/
32
INSU
LATO
RB
USH
ING
CO
NTA
CT
1 4
CR
IMP
HER
E
CLA
MP
NU
TB
RA
ID C
LAM
P
3 16
CR
IMP
HER
E
CLA
MP
NU
TB
RA
ID C
LAM
P
BR
AID
CLA
MP
CLA
MP
NU
T
CR
IMP
HER
E9 32
MO
UN
TS T
HR
U .0
80-.1
30PA
NEL
WIT
HO
UT
SPA
CER
MO
UN
TS T
HR
U .0
30-.0
80PA
NEL
WIT
H S
PAC
ER
SPA
CER
JAC
K
STR
AIG
HT
PLU
G
SPO
T ST
AK
EO
R S
OLD
ERSO
LDER
CO
ND
UC
TOR
AN
GLE
PLU
G
Figure 5-2 Fabrication of Coaxial test Cables2 2Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-15 Chapter 5 Troubleshooting
S
654
321
987
9
67
8
54
321
P
12
151413
1110
1819
17
20
16
14
17
1516
181920
1213
1110
P112-J512CABLE ASSEMBLY
P120-J620CABLE ASSEMBLY
P
10987654321
15
14131211
4
S
11109
1
876
23
5
15141312 P111-J811
ANDP119-J619
CABLE ASSEMBLIES
P
10987654321
11
4
S
11109
1
876
23
5
P
KJHFEDCBA
D
S
K
A
JHF
BC
E
P108-J208AND
P109-J709CABLE ASSEMBLIES P
HFEDCBA
D
S
A
HF
BC
E
P110-J410CABLE ASSEMBLY
NOTES:
1. ALL UNSHIELDED WIRES TO BE NO SMALLER THAN 18 GAGE STRANDED WIRE.ALL SHIELDED WIRES TO BE NO SMALLER THAN 18 GAGE SHIELDED.
2. LACE OR TAPE COMPLETED CABLES.
3. MAXIMUM CABLE LENGTH SHALL BE 24 INCHES.
4. CHECK CONTINUITY AFTER COMPLETING FABRICATION.
5. LABEL CABLES FOR IDENTIFICATION.
Rev: 12/04/99
DWG BY KH6GRT
Figure 5-3 Fabrication of Multi-conductor Test Cables3 3Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
9
8
76
5
4
3
21
13328K
00
- 36122K
00
6.3 VAC0.1
13628K
00
00
- 35122K
1
7
65
4
3
2
1
7
65
4
3
2
1
7
65
4
3
2
1
76
5
43
2
9
8
76
5
4
3
21
14223K
00
- 16.51 MEG
0.3636
6.3 VAC0.1
9257K
00
00
- 19.4330K
100-KCMULTIVIBRATOR
V2065814A
CALIBRATION OSC AND100-KC CATHODE FOLLOWER
V2055814A
- 3.4120K
0.157.2
00
6.3 VAC0.1
0.157.2
77 (45)75K (240K)
16526K
1ST CRYSTALOSCV207
5654/6AK5W
3RD MIXERV2046C4
19620K
NC
00
6.3 VAC0.1
9.62.2K
- 0.41 MEG
NC
00
NC
19620K
6.3 VAC0.1
NC
- 0.41.6 MEG
9.72.2K
- 0.41 MEG
2.8220
00
6.3 VAC0.1
18520K
15424K
2.8 (0)220 (0)
1ST MIXERV2026C4
RF AMPLV2016DC6
(NOTE 4)(NOTE 3)
(NOTES3 and 5)
(NOTE 4)
(NOTE 4)
V206 V205
V207
V204
V203
V202V201
NOTES:
1. TO OBTAIN MEASUREMENTS SHOWN ONV202 AND V207, OPERATE RECEIVER BELOW8 MHZ.
2. TO OBTAIN MEASUREMENTS SHOWN ONV205 AND V206, SET FUNCTION SWITCH INCAL POSITION.
3. OBTAINED WITH RF GAIN CONTROLCOMPLETELY CLOCKWISE.
4. OBTAINED WITH FUNCTION SWITCH INTHE AGC POSITION.
5. MEASUREMENTS AT V201, PIN 7 IN ( )ARE FOR RECEIVERS BEARING ORDERSNO. 14214-P-51, 375-P-54, 08719-P-55 (RF MOD2), AND ORDER NO. 363-P-54 (RF MOD 1).
6. VALUES IN ( ) FOR FC 7 ONLY.
SEE NOTE 2SEE NOTE 2 SEE NOTE 1
SEE NOTE 1
(NOTE 6)
Rev: 12/02/99
DWG BY KH6GRT
1
7
65
4
3
2
6.3 VAC0.1
NC
00
NC
- 0.41.6 MEG
9.22.2K
19920K
2ND MIXERV2036C4
(NOTE 4)
July 2009 Page 5-16 Chapter 5 Troubleshooting
Figure 5-4 RF Sub-chassis, Voltage and Resistance Diagram4 4Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
00
6.3 VAC0.1
0.28
0.28
9755K
16626K
- 10.3120K
1
7
6
54
3
2
2ND CRYSTAL OSCILLATORV401
5654/6AK5W
R40
5
L402
R40
7
R40
6
18522K
15022K
6.3 VAC0.1
20518K
16731K
18522K
6.25 VAC0.5
0.13 Rev: 12/03/99
DWG BY KH6GRT
V401
July 2009 Page 5-17 Chapter 5 Troubleshooting
Figure 5-5 Crystal Oscillator Sub-chassis, Voltage Resistance Diagram5
5Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
1
7 65
432
1
7 65
432
1
7 65
432
98
7
6
5
432
1
9
87
6
5
4
321
9
8
765
4
3
21
1
7 65
432
1
765
43 2
00
07
4.3400
18620K
00
00
6.3 VAC0.1
- 1.9100K (80K)
- 1.9100K (80K)
78 (- 0.2)900K (470k)
00
78 (- 0.2)900K (470K)
78 (+ 0.4)470K (525K)
5.3 VAC0.1
78 (- 0.3)1.3 M (820K)
00
78 (+ 0.4)470K (525K)
00
6.3 VAC0.1
18020K
9065K
- 2.5280K (125K)
01 MEG
2.5270
00
- 4.8150K
00.1
8253K ( )
8642K ( )
12 VAC4
6 VAC2.7
16520K
16520K
6.3 VAC0.1
00
9680-700
07
- 2.5280K (125K)
00
- 1.1 (- 17)25K (50K)
00
00
0.112
- 1.1 (- 17)25K (50K)
6.3 VAC0.1
27100K
- 0.4500K (0)
6.3 VAC0.1
18420K
10031K
00
2.9300 (100-10K)
- 0.4500K
2.9300 (100-10K)
6.3 VAC0.1
18020K
8831K
00
- 0.4500K
1.2100
1.2100
2ND IF AMPLV502
5749/6BA6W
3RD IF AMPLV503
5749/6BA6WNOTE 1
AGC TIME CONSTANTAND DETECTOR
V5065814A
NOTE 4
4TH IF AMPLV5046AK6
BFOV505
5749/6BA6WNOTE 3
AGC IF AMPLV508
5749/6BA6WNOTE 6
LIMITERV5075814A
NOTE 5
AGC RECTIFIERAND
IF CATHODE FOLLOWERV5095814A
NOTE 6
1
76 5
4
32
10018K
7.51K
19520K
6.3 VAC0.1
00
7.51K
- 0.4500K
1ST IF AMPLV501
5749/6BA6W
98
7
6
5
432
1
NC
NC
NC
25.2 VAC0.1
NC
NC
NC
NC
12 VAC4
CURRENT REGULATORRT5103TF7
78 (- 0.3)1.3 M (820K)
(NOTE 7)
(NOTE 8)(NOTE 7)
(NOTE 8)
(NOTE 7)
(NOTE 7)
(NOTE 8)
(NOTE 2)
(NOTE 2)
(NOTE 6)
V504
V506
V503
V502
V505
RT510
V508
V507
V509
V501
NOTES:
1. VOLTAGE AND RESISTANCEREADINGS ON V503 ARE WITH ANORMAL SETTING OF THE GAIN ADJCONTROL R519. MINIMUM(CLOCKWISE) AND MAXIMUM(COUNTER-CLOCKWISE) SETTINGSCHANGE VOLTAGE READINGS ASFOLLOWS:
P I N N O.R519 2 - 5 - 6 - 7MIN: 19 - 196 - 144 - 19MAX: 1.3 - 178 - 85 - 1.3
2. RESISTANCE VALUES IN ( )INDICATE RANGE OF READINGSDEPENDING UPON SETTING OFR519.
3. SET BFO SWITCH TO ONPOSITION. RESISTANCE VALUES OFPINS 5 AND 6 IN ( ) ARE TAKENWITH BFO SWITCH IN OFFPOSITION.
4. RESISTANCE READINGS OF PIN 2IN ( ) TAKEN WITH FUNCTIONSWITCH SET TO MGC . VALUES OFPINS 6 AND 7 IN ( ) TAKEN WITHLIMITER CONTROL SET TO 10 .
5. VALUES IN ( ) TAKEN WITHLIMITER CONTROL SET TO 10 .
6. RESISTANCE VALUES IN ( )TAKEN WITH FUNCTION SWITCHSET TO MGC .
7. RF GAIN CONTROLCOMPLETELY CLOCKWISE.
8. FUNCTION SWITCH IN AGCPOSITION.
9. RESISTANCE OF PIN 7 VARIESWITH SETTING OF CARR METERADJ CONTROL R523.
Rev: 12/02/99
DWG BY KH6GRT
(NOTE 9)
July 2009 Page 5-18 Chapter 5 Troubleshooting
Figure 5-6 IF Sub-chassis, Voltage and Resistance Diagram6 6Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
VARIABLE FREQUENCYOSCILLATOR
V7015749/6BA6W
1
7
65
4
3
2
6.3 VAC2.5
00
00
19520K
63 (58)75K (240K)
00.1
- 1.6150K
V701
(NOTE 1)
NOTE 1: VALUES IN ( ) FOR FC 7 ONLY.
Rev: 12/02/99
DWG BY KH6GRT
July 2009 Page 5-19 Chapter 5 Troubleshooting
Fig. 5-7 VFO Sub-chassis. Voltage and Resistance Diagram7 7Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
00
6.3 VAC0.110620
10620
21517k
20517k
10470K
1
7
6
54
3
2
LOCAL AF OUTPUTV6036AK6
6.3 VAC0.1
49200K
0470K
2.4740
00
00
53200K
0470K
2.5725
9
8
765
4
3
21
LOCAL AF AMPLAND
LINE AF AMPLV6025814A
6.3 VAC1
7376K
0680K
2.81.2K
00
00
20020K
3.3235K11.52.2K
9
8
765
4
3
21
1ST AF AMPLAND
AF CATHODE FOLLOWERV6015814A
NC
NC
00
NC
NC
15021K
NC 1
7
6
54
3
2
VOLTAGE REGULATORV6050A2
00
6.3 VAC0.1
00
10.3610
21517k
20517k
0470K
1
7
6
54
3
2
LOCAL AF OUTPUTV6046AK6
Rev: 12/02/99
DWG BY KH6GRT
V605
V601
V602
V604
V603
July 2009 Page 5-20 Chapter 5 Troubleshooting
Figure 5-8 AF Sub-chassis, Voltage and Resistance Diagram8
8Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-21 Chapter 5 Troubleshooting
24020K
NC
NC
285 VAC37
285 VAC37
NC
24020K
25.2 VAC0.1
00
19
8
765
4
3
2
RECTIFIERV802
26Z5W
24020K
NC
NC
285 VAC37
285 VAC37
NC
24020K
25.2 VAC0.1
00
19
8
765
4
3
2
RECTIFIERV801
26Z5W
NOTE: FC6 REPLACES V801 AND V802 WITH CR801 AND CR802. Rev: 12/02/99
DWG BY KH6GRT
V801V802
Figure 5-9 Power Supply Sub-chassis, Voltage and Resistance Diagram9 9Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-22 Chapter 5 Troubleshooting
C53
1
C54
9
R53
5
R52
6
R52
7
01.3 MEG
78 (-0.3)1.3 MEG (820K)
78 (0.4)470K (510K)
00
-1.227K (50K)
78 (-0.2)900K (470K)
-0.626K
0 (0.2)0 (56K)
-0.620K(26K)
-0.626K
LIMITER CONTROL SET AT OFF;VALUES IN ( ) W ITH LIMITER SET AT 10.
R615
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
R614
R610
R612
R625
R621
R623
R626
R622
C608
C609
R611
C604
C605
C607
R606
C602
R605
R608
R627
10620
2.4740
00
20517K
10.3610
20517K
2.5725
00
0470K
2.81200
00
0470K
53200K
21518K
0470K
0-6.50-1.25K
0470K
49200K
6.51.25K
11.52.2K
3.3235K
7376K
20020K
3.3235K
AF SUBCHASSIS
TB601
R53
9
R55
2
C53
9
C54
0
L504
0.13
00
00
18620K
0
19519K
0.13
0
0
0
IF SUBCHASSIS
TB502
TB501
DWG BY KH6GRT
Rev: 12/01/99
Depends on LOCAL GAIN setting
Depends on LINE GAIN setting0-6.50-1.25K
Figure 5-10 IF and AF Sub-chassis Resistor and Capacitor Terminal Boards, Voltage and Resistance Diagram10
10Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-23 Chapter 5 Troubleshooting
5.5.4 Receiver RF - IF Gain Test. The receiver RF - IF gain test checks receiver operation from the antenna through detector V506B. If the result of this test is normal, the fault is in the audio portion of the receiver.
1. Connect Multi-meter AN/PSM-4( ) to the DIODE LOAD test jack on the front panel of the receiver and set meter controls for measuring -10 VDC.
2. Connect Signal Generator AN/URM-25( ) to UNBALANCED ANT WHIP jack J103 on the
back of receiver and set the controls for a CW output of 10 micro-volts. (J104 must have short inserted if FC-5 is installed.)
3. Tune Signal Generator AN/URM-25( ) and the receiver to the same frequency. Readjust the
KILOCYCLE CHANGE control slightly for a maximum indication on the AN/PSM-4( ). Peak ANT TRIM control.
4. Adjust the output of the AN/URM-25( ) for a meter indication of -7 volts, If the AN/URM-
25( ) output is between 1 and 4 microvolts, the RF - IF gain of the receiver is normal. 5. If the AN/URM-25( ) output is above or below the limits set in 4 above, readjust the
AN/URM-25( ) output for 2 microvolts. Adjust GAIN ADJ control R519 (figure 6-16) for a meter indication of -7 volts. If this adjustment fails to restore normal operation, perform detailed checks of the IF and RF stages beginning with step 8 of table 5-5.
5.5.5 Trouble Isolation Table. The procedures in table 5-5 can be used to rapidly localize trouble to a particular stage. Preset the receiver front-panel controls as directed in paragraph 5.5.2. Use tube adapters to make connections where test jacks are not provided. Refer to figures 5-11 and 5-14 through 5-17.
Table 5-5 - Trouble Isolation Step No.
Test Instructions Sig. Gen Output Control
Normal
Indication
Instructions
1 Connect positive lead of Multi-meter AN/PSM-4( ) to F102 terminal and negative lead to ground.
N/A +240 VDC 1. If indication is correct, proceed to next step.
2. If indication is incorrect, check ac input circuit and power supply sub-chassis (figure 5-11).
2 Connect positive lead of Multi-meter AN/PSM-4( ) to F103 terminal and negative lead to ground.
N/A +205 VDC 1. If indication is correct, proceed to next step.
2. If indication is incorrect, check filter circuits in AF sub-chassis (figure 5-11).
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-24 Chapter 5 Troubleshooting
Step No.
Test Instructions Sig. Gen Output Control
Normal
Indication
Instructions
3 Connect positive lead of Multi-meter AN/PSM-4( ) to test point E607 on AF sub-chassis.
N/A +150 VDC 1. If indication is correct, power supply circuits are normal. Proceed with next step.
2. If indication is incorrect, check voltage regulator V605 circuit (figure 5-11).
4 Connect Signal Generator AN/URM-25( ) to pin 7 grid of V506. Set CARRIER LEVEL to 10 in CW mode and then set controls for an output of 455 kHz with 30% 400 Hz modulation. Set LINE METER switch to -10 and LINE GAIN control to 10.
0.1V -10 VU min 1. If indication is correct, proceed to step 5.
2. If indication is incorrect, proceed to step 6.
5 With the signal generator set up as in step 1, connect Electronic Multi-meter ME-6 D/U to PHONES jack J102 on the front panel.
0.1V -20 dB min 1. If the multi-meter reading is at least -20 dB, proceed to step 8. 2. If reading is incorrect, proceed to step 7.
6 Connect Audio Signal Generator AN/URM-127 to the following points and adjust its output to the given setting. Set the frequency to 800 Hz. Set LINE METER switch to 0. Set LINE GAIN control to 10.
Pin 1 Grid V604
Pin 7 Grid V602B
Pin 7 Grid V601B
Pin 2 Grid V601A
Pin 7 Grid V507
5.0V
0.2V
0.6V
0.04V
0.15V
0 VU min
0 VU min
0 VU min
0 VU min
0 VU min
1. Continue from stage to stage until an incorrect indication is obtained. The last circuit checked is defective or if all indications are correct, the trouble lies in detector circuit V506B (figure 5-16).
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-25 Chapter 5 Troubleshooting
Step No.
Test Instructions Sig. Gen Output Control
Normal
Indication
Instructions
7 Connect Electronic Multi-meter ME-6 D/U to PHONES jack J102 and Audio Signal Generator AN/URM-127 to the following points and adjust its output to the given setting. Set the frequency to 800 Hz.
Pin 1 Grid V603
Pin 2 Grid V602A
Pin 7 Grid V601B
1.1V
0.15V
0.4V
0 dB min
0 dB min
0 dB min
1. Continue from stage to stage until an incorrect indication is obtained. The last circuit checked is defective.
8 Set Signal Generator AN/URM-25( ) for an output of 455 kHz with 30% 400 Hz modulation and connect it to test point E211. Set LINE METER to 0 and LINE GAIN to 9.
10 µV
0 VU min
1. If indication is correct, proceed to step 10.
2. If indication is correct, proceed to next step.
9 With the signal generator set up as in step 8, connect to the following points in turn.
Pin 1 Grid V504 Set LINE METER (LM) to -10 and LINE GAIN (LG) to 10
Pin 1 Grid V503 Set LM to -10, LG to 8
Pin 1 Grid V502 Set LM to -10, LG to 9
Pin 1 Grid V501 Set LM to -10, LG to 9
0.01V
0.001V
100 µV
10 µV
0 VU min
0 VU min
0 VU min
0 VU min
1. Continue from stage to stage until an incorrect indication is obtained. The last circuit checked is defective.
2. If all indications are correct, proceed to next step.
10 Change the signal generator frequency to 3 MHz, check carrier level and % Mod, and connect to test point E211. Tune the receiver KILOCYCLE CHANGE control above 900 on the counter dial to a peak indication on the LEVEL METER. Set LM to -10, LG to 9.
10 µV 0 VU min 1. If indication is correct, proceed to next step.
2. If indication is not correct, the trouble is probably in the circuit of V701. See paragraph 5.5.3.
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-26 Chapter 5 Troubleshooting
Step No.
Test Instructions Sig. Gen Output Control
Normal
Indication
Instructions
11 Connect the signal generator to test point E210 with the frequency still at 3 MHz. Set LM to -10, LG to 9.
10 µV 0 VU min 1. If indication is correct, proceed to next step. 2. If indication is not correct the circuit of V203 is faulty.
12 With the signal generator connected to test point E210 change the signal generator frequency to 13 MHz. Tune the MEGACYCLE CHANGE control to 13 MHz and adjust the KILOCYCLE CHANGE control for a peak indication on the LEVEL METER. Rotate the MEGACYCLE CHANGE control from 14 thru. 31 MHz. Set LM to +10, LG to 10.
.001V 0 VU min 1. If indication is correct, the fault is probably in the 2nd crystal oscillator circuit V401. See paragraph 5.5.3 and figure 3-3.
13 Connect the signal generator to E209 and tune both the receiver and signal generator to 1 MHz peaking the LEVEL METER indication with the KILOCYCLE CHANGE control. Set LM to 0, LG to 9
.01V 0 VU min 1. If indication is correct, proceed to step 15.
2. If indication is incorrect, proceed to next step.
14 Change the signal generator frequency to 18 MHz and adjust for a peak on the LEVEL METER. Set LM to 0, LG to 8.
.001V 0 VU min 1. If indication is correct the faulty circuit is probably the 1st crystal oscillator V207. See paragraph 5.5.3.
2. If indication is incorrect, check the 1st mixer circuit V202.
15 Connect the signal generator to E208 and tune the frequency of the receiver and signal generator to 0.5 MHz adjusting the KILOCYCLE CHANGE control for a peak indication on the LEVEL METER. Check at 15 MHz and 31 MHz also. Set LM to 0, LG to 8.
.5MHz
10 µV
15 MHz
10 µV
31 MHz
10 µV
0 VU min
0 VU min
0 VU min
1. If indication is correct, proceed to next step.
2. If indication is incorrect, check the circuit of V201, figure 5-18.
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-27 Chapter 5 Troubleshooting
Step No.
Test Instructions Sig. Gen Output Control
Normal
Indication
Instructions
16 Connect the signal generator to J103 on back of receiver, Tune the receiver and signal generator to 15 MHz. Set LM to -10, LG to 10.
1 µV 0 vu min 1. If indication is correct, proceed to next step.
2. If indication is incorrect, check antenna input circuits.
17 Set FUNCTION switch to AGC position. With the signal generator connected as in previous step, observe indication of CARRIER LEVEL meter.
10 µV
100 µV
40 min
60 ± 2
1. If indication is normal, proceed to step 20.
2. If indication is abnormal, proceed to next step.
18 With the signal generator set up as in previous step, connect Oscilloscope AN/USM117( ) to IF OUTPUT jack on rear panel. Observe 455 kHz waveform.
100 µV 180 mV min 1. If indication is normal, proceed with next step.
2. If indication is abnormal, check the circuit of V509B.
19 Disconnect oscilloscope, and connect Multi-meter AN/PSM4( ) to TB102-3. Observe indication.
100 µV
10 mV
-4.0 VDC min
-1.4 VDC min
1. If indication is normal, trouble is in circuit of V506A.
2. If indication is abnormal, trouble is in circuits of V508 or V509A.
20 Disconnect signal generator. Set FUNCTION switch to CALIBRATE position and BFO switch to ON. Turn RF GAIN to 10, and tune receiver to a multiple of 100 kHz. Adjust ANT TRIM for max indication on CARRIER LEVEL meter.
N/A
40 dB min
1. If indication is normal, the receiver is operating properly.
2. If indication is abnormal, proceed to next step.
21 Connect Oscilloscope AN/ USM-117( ) to pin 7 grid of V205B and observe 100 kHz waveform.
N/A
54V p-p min
1. If indication is normal, check circuit of V205B.
2. If indication is abnormal, proceed to next step.
22 Remove V206 from its socket and connect oscilloscope to pin 2 grid of V206 socket. Observe 200 kHz waveform.
N/A
13.5V p-p min
1. If indication is normal, check circuit of V206.
2. If indication is abnormal, check circuit of V205A.
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-28 Chapter 5 Troubleshooting
5.5.6 DC Resistances of Transformers and Coils. The dc resistances of the windings of the transformers and coils in Radio Receiver R-390A/URR as measured with Multi-meter AN/PSM-4( ) are listed in table 5-6.
Table 5-6 - Transformer and Coil Resistances
R-F Sub-chassis
Transformer Terminals Ohms Coil Terminals Ohms HR202 1-3 5 Z201-1 1-3 2.8 L201 1-2 7 Z202-1 1-3 1.8 L202 1-2 0.6 Z203-1 1-3 1.2 L203 1-2 0.6 Z204-1 1-3 0.5 L204 1-2 0.6 Z205-1 1-3 0.2 L205 1-2 0.6 Z206-l 1-3 Less than 0.2 L206 1-2 0.6 Z201-2 1-3 2.8 L207 1-2 0.6 Z202-2 1-3 1.8 L208 1-2 7 Z203-2 1-3 1.2 L209 1-2 7 Z204-2 1-3 0.5 L210 0.15 Z205-2 1-3 0.2 L211 7 Z206-2 1-3 Less than 0.2 L236 0.3 Z213-1 1-3 Less than 0.2 T201 1-2
4-6 Less than 0.2
2.7
Z213-2 1-3 Less than 0.2
T202 1-2 4-6
Less than 0.2 1.2
Z213-3 1-3 Less than 0.2
T203 1-2 4-6
Less than 0.2 1.6
Z216-1 1-3 1.1
T204 1-2 4-6
Less than 0.2 4
Z216-2 1-3 1.1
T205 1-2 4-6
Less than 0.2 Less than 0.2
Z216-3 1-3 1.1
T208 1-5 2-3 3-4 2-4
2.5 2 2 4
T206 1-2 4-6
Less than 0.2 Less than 0.2
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-29 Chapter 5 Troubleshooting
Main Frame IF Sub-chassis
Transformer or Coil
Terminals Ohms Transformer or Coil
Terminals Ohms
FL101 A-A
B-B
Less than 0.1
Less than 0.1
FL502 1-2 3-4
40 40
K10l 1-2 200 FL503 1-2 3-4
40 40
FL504 1-2 3-4
40 40
FL505 1-2 3-4
40 40
L501 7 L502 90 L504 3 L505 90 Crystal-Oscillator Sub-chassis RT510 2-7 8
HR401 Gnd. J410- pin E
11 T501 1-2 4-5
6 6
L401 7 T502 1-2 4-5
6 6
L402 0.6 T503 1-2 3-4 4-5 3-5
6 6.1 6.3 0.2
T401 1-2 3-4
Less than 0.1 Less than 0.1
Z501 1-2 18.6
Z502 1-2 1-3 2-3
1.6 0.2
1.818 Z503 1-5
AF Sub-chassis VFO Sub-chassis
Transformer or Coil
Terminals Ohms Transformer or Coil
Terminals Ohms
FL601 1-2 2-3 1-3 230 250 480 L706 0.6 K601 1-7 2.8 Z702 1-2 3-4 4 0.5 L601 1-2 130 L602 1-2 125 L603 1-2 110 T601 1-2
3-4 5-6
580 28 30
T602 1-2 3-4 5-6
580 28 30
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-30 Chapter 5 Troubleshooting
5.5.7 Resistance Measurements at Sub-chassis Connectors. Connectors are used in this receiver to interconnect the various sub-chassis. Defects may be localized by measurement of the resistance to ground at the receptacle terminals of a sub-chassis. The charts below indicate the normal resistance between the indicated receptacle terminals and chassis ground. To prepare the receiver for these measurements, disconnect the receiver from the power source and remove the connectors from the sub-chassis suspected to be faulty.
Table 5-7 - Connector Resistance Measurements
RF Sub-chassis Crystal Oscillator Sub-chassis
Terminal of Receptacle J208
Resistance to Ground (ohms)
Terminal of Receptacle J410
Resistance to Ground (ohms)
A 92k A Inf. B 0.8 B 10 C Inf. C Inf. D Inf. D 0 E 1.8M E 11 F 100 F 11 H 0 H 0 J Inf. K Inf.
IF Sub-chassis
Terminal of Receptacle J512
Resistance to Ground (ohms)
Terminal of Receptacle J512
Resistance to Ground (ohms)
1 Infinity (∞) 11 Infinity (∞) 2 54k 12 27 3 54k 13 Infinity (∞) 4 474k 14 0 to 18 5 Infinity (∞) 15 134k 6 Infinity (∞) 16 104k 7 Infinity (∞) 17 0 8 Infinity (∞) 18 0 9 Infinity (∞) 19 Infinity (∞) 10 444k 20 0.5
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-31 Chapter 5 Troubleshooting
Table 5-7 - Connector Resistance Measurements - Continued
AF Sub-chassis
Terminal of Receptacle J619
Resistance to Ground (ohms)
Terminal of Receptacle J620
Resistance of Ground (ohms)
1 3.6 1 Infinity (∞) 2 90k 2 940k 3 92k 3 Infinity (∞) 4 93k 4 470k 5 90k 5 200 6 Infinity (∞) 6 Infinity (∞) 7 Infinity (∞) 7 200 8 Infinity (∞) 8 Infinity (∞) 9 58 9 Infinity (∞) 10 Less than 0.1 10 Infinity (∞) 11 0 11 Infinity (∞) 12 Infinity (∞) 13 0 14 1.35M 15 Infinity (∞)
VFO Sub-chassis Power Supply Sub-chassis
Terminal of Receptacle J709
Resistance to Ground
Terminal of Receptacle J811
Resistance to Ground
A Infinity (∞) 1 Less than 0.1 B Infinity (∞) 2 0 C Infinity (∞) 3 Infinity (∞) D Infinity (∞) 4 Infinity (∞) E Infinity (∞) 5 Infinity (∞) F 0 6 Infinity (∞) H 3.5 7 Infinity (∞) J Infinity (∞) 8 Infinity (∞) K Infinity (∞) 9 Infinity (∞) 10 Less than 0. 11 0
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-32 Chapter 5 Troubleshooting
SEE FIGURE 5-14FILAMENT AND OVEN CKTS
7
5
10
6
1
J619P119
TOASSOCIATEDTRANSMITTER
K101
+240 VDC
6.3VAC
5
2
1
10
11
L603FILTER
BREAK-IN
TB103
9
+215 VDCAF B+LINE
RF-IF B+ LINE+205 VDC
STANDBY
OFF
CAL
6
811
53
S102FRONT
E607
+150 VDC REGULATED
R619 SHORTING LINE
R619
L602FILTER
F1021/4 AMP
F1031/8 AMP
4
3
2
8
75
4
2
1 OFF
STANDBY
AGC
CAL
S102REAR
VOLTAGEREGULATOR
V605
BREAK-INS103
BFOS101
+205 VDC
+205 VDC
+150 REG
+150 REG
CA
L O
SC
B+
LIN
E
+205
VD
C
3
21
OFF
ON
+205 VDC
+205 VDC
P112
P110
7
4
3
6
1
4
3
2TB801
T801
12
11
8
10
7
6
5
1
2
3
4 6.3VAC
25.2VAC
J811J811
WIRED FOR 115VAC
POWER SUPPLYSUBCHASSIS
+240 VDC
3
3
16
16
RECTV801
RECTV802
7
4
3
6
1
4
3
2TB801
T801
12
11
8
10
7
6
5
1
2
3
4 6.3VAC
25.2VAC
J811J811
WIRED FOR 230VAC
POWER SUPPLYSUBCHASSIS
+240 VDC
3
3
16
16
RECTV801
RECTV802
P111
YEL
RED
BLU20 VDC
YEL
J619P119
AF SUBCHASSIS
NOTE 1
NOTE 1
NOTES:
1. FC 6 CHANGES RECTIFIERS V801 ANDV802 TO CR801 AND CR802.
2. FUNCTION SWITCH S102 SHOWN IN OFFPOSITION.
3. SEE TABLE 2-3 FOR ALTERNATEFUSES.
4, REFER TO EIB 895.
V505 - 5,6
IF SUBCHASSISV509B - 6V508 - 5,6V507 - 1,6V506A - 1V504 - 5,6V503 - 5,6V502 - 5,6V501 - 5,6 2
11
J512
V401 - 5
V401 - 6
CRYSTAL OSCSUBCHASSIS
C
AJ410
FUNCTIONNOTE 2
V601 - 1,6
V604 - 5,6V603 - 5,6V602 - 1,6
P108V207 - 6
V207 - 5
RFSUBCHASSIS
D
K
A
JV205 - 1,6V206 - 1,6
V204 - 1V203 - 1V202 - 1V201 - 5,6
J208
+205 VDC
+150 REG
P109
V701 - 6
V701 - 5VFO
SUBCHASSIS
B
AJ709
OFFON
DWG BY KH6GRT
L601FILTERNOTE 4
C603B
R617C603CR618
C606
SWITCHEDRF/IF B+
LINE
RF/
IF B
+ LI
NE
+205 VDC
8
8
8
8
F1013 AMP
S102
3
2
1
PART OFFUNCTION
FL101
NOTE 3
7
1
BREAK-IN RELAY
K601
CR102
POWERCORD
C B A
4
53
123
P111
10
11
2
1
5
Figure 5-11 Power Distribution Diagram11 11Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-33 Chapter 5 Troubleshooting
RF AMPLV2016DC6 L202
10 UH
C3005000
L20310 UH
C3015000
V2026C4
1ST MIXER
L20410 UH
L20510 UH
C3035000
C3025000
V2046C4
V2036C4
3RD MIXER2ND MIXER
L20610 UH
L20710 UH
C3045000
C3035000
V2075654/6AK5W
V2065814A
100 KHZMULTIVIBRATOR1ST CRYSTAL OSC
V2055814A
CAL OSC AND100 KHZ CATHODE
FOLLOW ER
L23610 UH
1ST IF AMPL 2ND IF AMPL
4TH IF AMPL3RD IF AMPL
AGC TIMECONSTANT
AND DETAGC IF AMPL
AGC RECT ANDIF CATHODEFOLLOW ER
V501 5749/6BA6W
V5046AK6
V5065814A
V5095814A
V505 5749/6BA6W
V502 5749/6BA6W
V503 5749/6BA6W
V508 5749/6BA6W
C5380.1
CURRENTREGULATORBFO
RT510
IF SUBCHASSIS
RF SUBCHASSIS
CR102
TO ANTENARELAY K101
TO TERMINAL 4OF BREAK-INRELAY K601
BLU
RED YEL
YEL
_
+
PARTOF
T801
POWER SUPPLY SUBCHASSIS
RECTIFIER RECTIFIERV801
26Z5WV802
26Z5W
6.3 VAC8 AMP
25.2 VAC1.2 AMP
10
1
B
F
20
19
8
J811
J811
P111
P111
J208P108
P112J512
J512 P112
ONOFF
OVENSS106
6.3 VAC
25.2VAC
25.2
VA
C S
WIT
CH
ED
2nd CRYSTAL OSCV401
5654/6AK5W
C4145000
L402 10UH
C4155000
C4065000
PART OFOVENHR401
CRYSTAL OSCILLATORSUBCHASSIS
F
E
BP110 J410
P416
P417
J417
J416
S403
V6015814A
1ST AF AMPL AND AFCATHODE FOLLOW ER
LOCAL AF AMPLAND LINE AF AMPL
V6025814A
LINE AFOUTPUT
LOCAL AFOUTPUT
V6046AK6
V6036AK6
AF SUBCHASSIS
10 J619P119
C3090.1
C2560.1
R23547
PART OF CRYSTAL OVENHR202
J208P108
7
1
3
43 4 3
4 343
4,5943
4,59
5454
11
12
10
9
8
4327
344
3
43
43
4,59
4,594
3
VFOV701
5749/6BA6W
C7135000
C7125000
L70610 UH
C7105000
C7115000
L7057.5 UH
S701
PART OFOVEN HR701
VFO SUBCHASSIS
E
D
K
J
H
P109J709
6.3
VAC
6.3
VAC
25.2
VA
C S
WIT
CH
ED
43
43
4,59
43
4,59
43
NOTE: V801 AND V802 CHANGED TOSILICON DIODES IN FIELD CHANGE 6.
DWG BY KH6GRT
DIALLIGHTS
#328
R1242.7
I101
I102
8W
H
DJ410P110
45W
LIMITERV5075814A
4,59
R5364
Figure 5-12 Filament and Oven Circuits12 12Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-34 Chapter 5 Troubleshooting
2
V6036AK6
7
16
FIELD CHANGE NO. 1SUPPRESSOR GRID
CONNECTED TO CATHODE
R112200
R115200
R111200
R114200
R113250
FIELD CHANGE NO. 2CONVERSION TO 450OHM SHUNT LOAD
T602
7
621
5
2,7
61
5
R702220K
C3265000 R210
220K
FIELD CHANGE NO. 7CONVERSION OF R702 AND R210
1ST CRYSTAL OSC(V207)
VFO(V701)
1
4
3
2
4
3
2
1T801
4
3
8
6
7
TB801
TO FL101
TO S102-2
ELAPSEDTIME
INDICATOR
W IRED FOR 230 VAC
1
4
3
2
4
3
2
1T801
4
3
8
6
7
TB801
TO FL101
TO S102-2
ELAPSEDTIME
INDICATOR
W IRED FOR 115 VAC
P111 J811 P111 J811
FIELD CHANGE NO. 8PROVIDES ELAPSED TIME INDICATOR
J901
BCAB
A
A
FL101
B
B
A
J902
J903
TB103
TB102
FIELD CHANGE NO. 3 (EIB 702)CONVERSION TO AN TYPE
CONNECTORS
TB103
TO J811-1
TO J811-5
8
5
6
7
10
9
T801
CR8021N561
CR8011N561
FIELD CHANGE NO. 6 (EIB 702)CONVERSION TO SILICON
DIODES
TB103
J904DIODELOAD
FIELD CHANGE NO. 4 (EIB 655)PROVIDES FRONT PANEL
DIODE TEST JACK
J104SHORTING
PLUG
125 OHMBALANCED
W HIPUNBALANCED
R121220KI103 J105 P206
P207J107
P205J106
TOS205-9
TOS202-9
TOS201-9
FIELD CHANGE NO. 5 (EIB 664)ANTENNA INPUT MODIFIED ONSHIPBOARD INSTALLATIONS -
USE J103 AS ANTENNA INPUT JACK.REVERSE CABLES TO J105 AND J106
Rev: 11/2/99
NOTE: THISW IRE MOVEDFROM TB801-1
TO TB801-4
NOTE: THISW IRE MOVEDFROM TB801-3
TO TB801-4
14
7
6
13
16
10
11
12
J103
Figure 5-13 Field Changes 13, 14
13Courtesy of Pete Wokoun, KH6GRT 14Table 1-9 identifies specific production modifications and associated contract numbers
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-35 Chapter 5 Troubleshooting
BR
EAK
-IN
FUN
CTI
ON
OFF
,A
GC
,M
GC
STB
Y,C
AL
ON
OFF
TOA
SSO
CIA
TED
XMTR
TB10
3
9
3
21
K60
16.
3 VA
C
S102
FRO
NT 6
8,11
CR
102
25.2
VA
C
K10
1B
K10
1A
UN
BA
LAN
CED
AN
TEN
NA
(WH
IP)
BA
LAN
CED
AN
TEN
NA
(125
OH
M)
J107
J104
J106
J103
J105
RF
SUB
CH
ASS
IS
NO
TES:
1. P
rimar
y tr
imm
ers
C20
1A, C
205A
, C20
9A, C
213A
,C
217A
, and
C22
1A.
S
econ
dary
trim
mer
s C
201B
, C20
5B, C
209B
,C
213B
, C21
7B, a
nd C
221B
.
0.5
TO 3
2 M
HZ
DW
G B
Y KH
6GR
T
0.5
TO 3
2 M
HZ
AG
C
E208
100
KH
Z &
HA
RM
ON
ICS
RF
AM
PLV2
016D
C6
TO J
512-
16TB
102
RF
GA
IN
5P
2K
1G
J208
P108
C
TO M
IXER
STA
GES
Fig.
5-1
5
CA
THO
DE
BIA
S LI
NE
1 2
Fig.
5-1
6
R10
3
RF
GA
IN
100
KH
ZM
ULT
IVIB
RA
TOR
V206
5814
A
100
KH
ZC
ATH
FO
LV2
05B
(1/2
)58
14A
CA
LIB
RA
TIO
NO
SCV2
05A
(1/2
) 581
4A
CA
LS1
02R
EAR
4
C31
0C
AL
AD
J
B+
B+
B+
B+
J208
P108
J
2G1P
7G6P
8K
FUN
CTI
ON
1
S20111
9
8
7
61
12.5
TO
1M
HZ
1 TO
2M
HZ
2 TO
4M
HZ
4 TO
8M
HZ
8 TO
16
MH
Z
16 T
O 3
2M
HZ
AN
T TR
IMSE
EN
OTE
1
S202
9
8
7
61
1211
2 122222 1 1 1 1 1
5555554 4 4 4 4 4
T201
T202
T203
T204
T205
T206
S204
FRO
NT
8
87
61
1211
S2059
8
7
61
1211
C20
4
C20
8
C21
2
C21
6
C22
0
C22
4
P205
P207
P206
MEG
AC
YCLE
CH
AN
GE
MEG
AC
YCLE
CH
AN
GE
KIL
OC
YCLE
CH
AN
GE
AN
D /
OR
S103
SEE
Fig.
5-17
4
3
5
Figure 5-14 Signal Flow Diagram, Part 1 of 4 - RF Stage15 15Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-36 Chapter 5 Troubleshooting
2nd
XTA
LO
SCV4
0156
54/6
AK
5W
3rd
MIX
ERV2
046C
4
1 TO
2 M
HZ
1st M
IXER
V202
6C4
1st X
TAL
OSC
V207
5654
/6A
K5W
2nd
MIX
ERV2
036C
4
T207
Z216
-1,2
,3
S402 S401
E209
AG
C
S207
P221
J221
PLA
TE C
IRC
UIT
TRIM
MER
S C
429A
-H,
C43
0A-H
, and
C43
1A-
H
E210
AG
C
E211
AG
C
T208
L234
VFO
V701
5749
/6B
A6W
L701
VFO
SU
BC
HA
SSIS
END
PO
INT
AD
J
7.4
TO 3
.5 M
HZ
3.45
5 TO
2.45
5M
HZ
Z213
-1,2
,3
C28
3-1,
2,3
3 TO
2 M
HZ
17.5
TO
25
MH
ZO
R 8
TO
32
MH
Z
XTA
L O
SCSU
BC
HA
SSIS
11 T
O 3
4 M
HZ
IN 3
2 ST
EPS
0.5
TO 1
MH
Z
2 TO
4M
HZ
4 TO
8M
HZ
8 TO
16
MH
Z
16 T
O 3
2 M
HZ
S206
11 9
87
61
12
9
61
1211
1P
7K
6G
0.5
TO 8
MH
Z
33
11
8
7
12
16 T
O 3
2 M
HZ
8 TO
16
MH
Z
1 7
6
P K
G
P215
J415
3
T401
L403
2 5P
1G
C29
1-1,
2,3
33
42
11P
7K
6G
455
KH
Z P213
P218
J217
P717
Z702
+150
VD
CR
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CH
ASS
IS
DW
G B
Y KH
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T
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M R
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AG
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g 5-
14
TOIF
STA
GES
Fig.
5-1
6
J513
J518
S208
REA
R
J208
P108
D7
6
TRIM
MER
S C
230-
1,C
233-
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242-
1, a
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1
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TRIM
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NT
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GE
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AN
GE
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6
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25
17.5
TO
25
MH
Z
17 M
HZ
Y201
17 M
HZ
E402
Y401
-Y41
5
Figure 5-15 Signal Flow Diagram, Part 2 of 4 - Mixer Stages16 16Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-37 Chapter 5 Troubleshooting
DW
G B
Y KH
6GR
T
2nd
IF A
MPL
V502
5749
/6B
A6W
3rd
IF A
MPL
V503
5749
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A6W
T501
T502
S501
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2
C50
3
J512J518
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HA
NIC
AL
FILT
ERS
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5
16 K
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4
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3
4 K
HZ
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2
2 K
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NT
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C
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L506 45
5 K
HZ AG
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5 K
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IAS
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E
From
Fig.
5-1
4
J513
712
34
5 616
84
2
1 .1
BA
ND
WID
THK
C
3 4
21 5
16
7
65
4 3
21
8
4 2
1.1
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2,7
K
1G2
44
5P
2,7
K
1G2
IF S
UB
CH
ASS
IS
C52
0L5
03
From
Mix
erSt
ages
Fig.
5-1
5S5
02FR
ON
T
7
65
43
21
1st I
F A
MPL
V501
5749
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A6W
AG
C1G
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P 5
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ATH
FOLL
OW
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ECT
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IME
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ECTO
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5749
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ITER
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5814
A
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MPL
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6
T503
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PIT
CH
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L509
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HZ
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IOST
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g. 5
-17
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ITER
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ON
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MEDSL
OW
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TO V
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503
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R-M
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JUST
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HM
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ECTE
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5
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31
2
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6
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RIE
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DE
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AD
J
FUN
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C
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ND
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1
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2
NO
RD
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GC
46
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53
4S1
02
C55
1
Figure 5-16 Signal Flow Diagram, Part 3 of 4 - IF Stages17 17Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-38 Chapter 5 Troubleshooting
1st A
F A
MPL
V601
A(1
/2) 5
814A
AF
CA
THFO
LLO
WER
V601
B(1
/2) 5
814A
LOC
AL
AF
OU
TPU
TV6
036A
K6
LOC
AL
AF
AM
PV6
02A
(1/2
) 581
4A
TB10
2
LIN
E LE
VEL
SHU
NTS
AN
DD
IVID
ERS
6
2
LIN
E A
F A
MP
V602
B(1
/2) 5
814A
LIN
E A
FO
UTP
UT
V604
6AK
6
J620
P120
TB10
3
M10
1 LIN
E M
ETER
OFF +10/
0/-1
0
S105
LIN
E A
UD
IO LOC
AL
AU
DIO
R10
1
PHO
NES
J102
J619
PHN
S
T601
T602
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4
R10
5
LIN
EG
AIN
LOC
AL
GA
IN
R10
4
J620
J620
J620
J620
J620
J620
P120
P120
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P120
P120
P120
P119
P120
6812
3
1013
2
1 7
6 8
3
5P1
6PG
7G
1P2G
15P
1G
13
2
4
9
7
3
1
2
614
WID
ESH
AR
P
FRO
M IF
STA
GES
Fig
5-16
1P
2G
8K
7G
AF
SUB
CH
ASS
IS
K60
1
Fig
5-14
BR
EAK
-INR
ELA
Y
DW
G B
Y KH
6GR
T
S104
6
1
9
VU
8
8
AU
DIO
RES
PON
SE800
HZ
BP
FILT
ER
FL60
1 31
Figure 5-17 Signal Flow Diagram, Part 4 of 4 - Audio Stages18 11Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-39 Chapter 5 Troubleshooting
4 3
1
5 6
2
C20
412
0
C20
333
0
C20
1A3-
12
C20
27
C20
1B8-
50
L213
L212
4 3
1
5 6
2
C20
875
C20
712
0
C20
5A3-
12
C20
67
C20
5B8-
50
L215
L214
4 31
5 6
2
C21
624
C21
510
0
C21
3A3-
12
C21
47
C21
3B5-
25
L219
L218
4 3
1
5 6
2
C22
012
C21
95
C21
7A3-
12
C21
87
C21
7B3-
12
L221
L220
4 31
5 6
2
C22
45
C22
318
C22
1A3-
12
C22
27
C22
1B1.
5-7
L223
L222
C22
7.0
47
RED
BLU
TOC
ALI
BR
ATI
ON
OS
CIL
LATO
RFi
g. 5
-20
SW
ITC
HE
D R
F-IF
B+
LIN
EFi
g 5-
20
AG
C L
INE
2ND
MIX
ER
Fig.
5-1
9
S20
2
98
76
1211
1
P20
7J1
07
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1A
K10
1B
J106
P20
6
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T206
1
6 TO
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S20
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T
S20
5
S20
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R
S20
3FR
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6
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11
5
76
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112
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9 8
76
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9
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6
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5000
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C
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2-1
Fig
5-22
TO 1
stM
IXE
RFi
g. 5
-19
ME
GA
CY
CLE
CH
AN
GE
ME
GA
CY
CLE
CH
AN
GE
AN
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CY
CLE
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AN
GE
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2
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ED
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OH
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ED
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TES:
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NTE
NN
A, R
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ND
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ED A
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TER
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.
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RO
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CTI
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DS.
4. R
EFER
TO
TAB
LE 1
-8, F
IELD
CH
ANG
E D
ATA,
AN
D F
IGU
RE
5-15
.
5. R
EFER
TO
TAB
LE 2
-3 F
OR
FU
SED
ATA.
6.
=
INTR
ACH
ASSI
S C
ON
N.
=
INTE
RC
HAS
SIS
CO
NN
.
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P20
5
R23 4
1.5M
DW
G B
Y KH
6GR
T
4 3
1
5 6
2
C21
239
C21
136
C20
9A3-
12
C21
07
C20
9B8-
50
L217
L216
T203
2
TO
4 M
HZ
8
9
76
1112
1S
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A
CD
PB
CA
THO
DE
BIA
S L
INE
TO C
R10
2Fi
g. 5
-24
AE
TO C
R10
2Fi
g. 5
-24
AD
+205
VD
C
NO
TE 4
Figure 5-18 Schematic Diagram, Part 1 of 7 - RF Amplifier19 19Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-40 Chapter 5 Troubleshooting
3
12
C23
8-1
1500
C23
7-1
120
C23
6-1
8-50
L226
-1
Z203
-1
3
12
C23
5-1
2400
C23
4-1
180
C23
3-1
8-50
L225
-1
Z202
-1
C33
1-1
68
3
12
C23
2-1
2400
(150
0)N
OTE
2S
heet
1
C23
1-1
160
C23
0-1
8-50
L224
-1
Z201
-1
C33
0-1
300
8
9
76
1112
1S
206
3 1
C28
3-1
5-25
Z213
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12
C23
2-2
2400
(150
0)N
OTE
2S
heet
1
C23
1-2
160
C23
0-2
8-50
L224
-2
Z201
-2
C33
0-2
300
3
12
C23
5-2
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4-2
180
C23
3-2
8-50
L225
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Z202
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C33
1-2
68
3
12
C23
8-2
1500
C23
7-2
120
C23
6-2
8-50
L226
-2
Z203
-28
9
76
1112
1
S20
7
C28
11.
5
C31
851
3 1
C28
3-2
5-25
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3 1
C28
3-3
5-25
Z213
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R20
92.
2K
R23
11M
C27
450
00
R23
222
K
C32
420 C32
520
0
C32
850
00C
327
100
C27
750
00
C27
350
00
C25
48
C25
34
C25
22
C27
815C27
615 C27
915
R20
712
0K
Y20
117
MH
Z
PA
RT
OF
HR
202
4
6
2,7
61
5 L201
0.5
MH
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056
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18.
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827
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9
L232
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L232
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L232
-3
C33
451
C32
968
C28
21.
5
R21
22.
2K
J221
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1
7
6
1
1ST
MIX
ER
V20
26C
4
OU
TPU
T TO
2ND
MIX
ER
She
et 3
B
FRO
M R
FA
MP
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ER
STA
GE
She
et 1
A
L208
0.5
MH
AG
C L
INE
2ND
MIX
ER
She
et 3
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GC
LIN
ER
F A
MP
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ER
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et 1
B
ME
GA
CY
CLE
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AN
GE
AN
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CLE
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AN
GE
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BC
HA
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YS
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CIL
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5654
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8 TO
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MH
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16 T
O 3
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4 TO
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2 TO
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0.5
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1 TO
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0.5
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MH
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1 TO
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2 TO
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4 TO
8M
HZ
8 TO
16
MH
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16 T
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2M
HZ
NO
TE 1
, S
heet
1
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450
00
SW
ITC
HE
DR
F-IF
B+
LIN
ES
heet
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43
21
L230
L231
76
121
S20
8FR
ON
T
87
1112
S20
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R
C27
550
00(.0
33)
NO
TE 3
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g. 5
-18
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850
00
C28
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00
C32
650
00
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5
3
12
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7-1
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C24
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13-
12
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3
12
C24
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180
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13-
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3
12
C24
1-1
470
C24
0-1
68C
239-
15-
25
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Z204
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12
C24
1-2
470
C24
0-2
68C
239-
25-
25
L227
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Z204
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3
12
C24
4-2
180
C24
3-2
68C
242-
23-
12
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3
12
C24
7-2
33
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6-2
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23-
12
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C25
11
C25
075
C24
95
C32
112
C32
212 C32
35
C24
850
00
R20
52.
2K
DW
G B
Y KH
6GR
T
RF-
IFB
+ LI
NE
She
et 7
W
ME
GA
CY
CLE
CH
AN
GE
NO
TE 2
, She
et 1
RE
GU
LATE
D+1
50 V
LIN
ES
heet
7H
+205
VD
C
+205
VD
C
J208
P10
8H
(220
K)
Not
e 4,
Fig.
5-1
8
5
49
8
NO
TE 2
, She
et 1
Figure 5-19 Part 2 of 7 - 1st Mixer and 1st Crystal Oscillator
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-41 Chapter 5 Troubleshooting
R23
027
7
6
1
3RD
MIX
ER
V20
46C
4
C30
750
00
R21
82.
2K
C29
850
00R
219
2.2K
C31
615
R22
85.
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R22
222
KR
225
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C31
422
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315
220
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410
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C31
322
0
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139
K C31
215
0
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033
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C31
110
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203
200
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Z
C32
010
00
C31
750
00C
309
0.1
L236
10 U
H
SW
ITC
HE
DR
F-IF
B+
LIN
EFi
g. 5
-19
F
L211
0.5
MH
R22
71M
PA
RT
OF
CR
YS
TAL
OV
EN
HR
202
C31
03.
5-60
.1
SW
ITC
HE
D R
F-IF
B+
LIN
EP
112-
2Fi
g. 5
-22
FRO
M 1
ST
MIX
ER
STA
GE
Fig.
5-1
9B
AG
C L
INE
1ST
MIX
ER
Fig.
5-1
9E
C25
60.
1
R23
547
C29
927
0 L234
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17
3 1
C29
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5-25
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C29
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100
3 1
C29
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5-25
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C29
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5-25
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00
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92
C29
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747
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00
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7
6
1
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MIX
ER
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100 R
213
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5000
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0
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950
00
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8
J208
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8
L209
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MH
TO J
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IF S
UB
CH
AS
SIS
Fig.
5-2
2
TO J
518
IF S
UB
CH
AS
SIS
Fig.
5-2
2
E21
1
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Figure 5-20 Schematic Diagram, Part 3 of 7 - 2nd Mixer and VFO21 21Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-42 Chapter 5 Troubleshooting
31
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Figure 5-21 Schematic Diagram, Part 4 of 7 - 2nd Crystal Oscillator22 22Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-43 Chapter 5 Troubleshooting
C52
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Figure 5-22 Schematic Diagram, Part 5 of 7 - IF Amplifiers, AGC, Limiter and Detector23 23 Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-44 Chapter 5 Troubleshooting
R60
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Figure 5-24 Schematic Diagram, Part 6 of 7 - Line and Local Audio Amplifiers 25Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-45 Chapter 5 Troubleshooting
C10
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Figure 5-24 Schematic Diagram, Part 7 of 7 - Power Supply25 25Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-46 Chapter 5 Troubleshooting
Figure 5-25 Power Distribution Levels 25 25Courtesy of Pete Wokoun, KH6GRT
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-47 Chapter 5 Troubleshooting
REF DESIG SHEET ZONE
C209B 1 A C210 1 A C211 B C212 1 B C213A 1 C C213B 1 C214 1 C
1 D C216 1 B C217A 1 C C217B C C218 1 C
5-18 through 5-24. Sheet refers to the sheet number within the schematic diagram.
• Figure 5-18 = Sheet 1 • Figure 5-19 = Sheet 2 • Figure 5-20 = Sheet 3 • Figure 5-21 = Sheet 4
• Figure 5-23 = Sheet 6 • Figure 5-24 = Sheet 7
Zone refers to location quadrant on a sheet, i.e. • A = Upper Left • B = Upper Right • C = Lower Left • D = Lower Right
Table 5-8 - Schematic Component Location Zones
5.6 Zoning for schematic diagrams figures
1
C • Figure 5-22 = Sheet 5
C215
1
C219 1 D C220 1 D C221A 1 C C221B 1 C C222 1 C C223 1 D C224 1 D
REF DESIG SHEET ZONE C225A 1 D C225B 1 D
Capacitors C226 1 D C101 5 D C227 1 B C102 7 B C228 1 B C103 5 C C229 1 D C104 7 C C230-1 2 A C105 7 C C230-2 2 A C106 7 C C231-1 2 A C107 7 C C228 1 B C201A 1 A C229 1 D C201B 1 A C230-1 2 A C202 1 A C230-2 2 A C203 1 B C231-1 2 A C204 1 B C231-2 2 A C205A 1 A C232-1 2 A C205B 1 A C232-2 2 A C206 1 A C233-1 2 A C207 1 B C233-2 2 A C208 1 B C234-1 2 A C209A 1 A C234-2 2 A
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-48 Chapter 5 Troubleshooting
REF DESIG SHEET ZONE REF DESIG SHEET ZONE
Capacitors Cont. C275 2 D
C235-1 2 A C276 2 B C235-2 2 A C277 2 B C236-1 2 A C278 2 B C236-2 2 A C279 2 B C237-1 2 A C280 2 B C237-2 2 A C281 2 B C238-1 2 A C282 2 B C238-2 2 A C283-1 2 B C239-1 2 C C283-2 2 B C239-2 2 C C283-3 2 B C240-1 2 C C284 2 D C240-2 2 C C285 7 A C241-1 2 C C286 3 A C241-2 2 C C287 3 A C242-1 2 C C288 3 A C242-2 2 C C289 3 A C243-1 2 C C290 3 A C243-2 2 C C291-1 3 A C244-1 2 C C291-2 3 A C244-2 2 C C291-3 3 A C245-1 2 C C292-1 3 A C245-2 2 C C292-2 3 A C246-1 2 C C292-3 3 A C246-2 2 C C297 3 A C247-1 2 C C298 3 B C247-2 2 C C299 3 B C248 2 C C300 7 A C249 2 C C301 7 A C250 2 C C302 7 A C251 2 C C303 7 A C252 2 A C304 7 A C253 2 A C305 7 A C254 2 A C307 3 B C255 1 B C308 2 B C256 3 C C309 3 C C257 1 B C311 3 C C273 2 B C312 3 C C274 2 B C313 3 C
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-49 Chapter 5 Troubleshooting
REF DESIG SHEET ZONE REF DESIG SHEET ZONE
C420 4 D Capacitors Cont. C421 4 D
C314 3 C C422 4 D C315 3 C C423 4 D C316 3 C C424 4 D C317 3 C C425 4 D C318 2 B C426 4 B C319 3 A C427 4 B C320 3 C C428 4 B C321 2 D C429A 4 D C322 2 D C429B 4 D C323 2 D C429C 4 D C324 2 D C429D 4 D C325 2 D C429E 4 B C326 2 D C429F 4 B C327 2 D C429G 4 B C328 2 D C429H 4 B C329 2 B C430A 4 D C330-1 2 A C430B 4 D C330-2 2 A C430C 4 B C331-1 2 A C430D 4 B C331-2 2 A C430E 4 B C334 2 B C430F 4 B C401 4 C C430G 4 B C402 4 C C430H 4 B C403 4 A C431A 4 D C404 4 A C431B 4 D C406 4 C C431C 4 B C407 4 C C431D 4 B C408 4 C C431E 4 B C409 4 C C431F 4 B C410 4 C C431G 4 B C411 4 B C431H 4 B C412 4 D C501 5 A C413 4 D C502 5 A C414 7 B C503 5 A C415 7 B C504 5 A C417 4 D C505 5 A C418 4 D C506 5 A C419 4 D C507 5 A
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-50 Chapter 5 Troubleshooting
REF DESIG SHEET ZONE REF DESIG SHEET ZONE C546 5 C
Capacitors Cont. C547 5 C C508 5 A C548 5 C C509 5 A C549 5 D C510 5 A C551 5 C C511 5 A C552 5 B C512 5 A C553 5 A C513 5 A C554 5 B C514 5 A C555 5 B C515 5 A C556 5 B C516 5 A C557 5 B C517 5 A C558 5 B C518 5 B C559 5 B C519 5 B C560 5 B C520 5 A C561 5 D C521 5 B C562 5 D C522 5 B C563 5 C C523 5 B C601 6 A C524 5 A C602 6 A C525 5 D C603A 6 C C526 5 B C603B 6 C C527 5 B C603C 7 D C528 5 D C604 6 A C529 5 B C605 6 B C530 5 D C606A 7 D C531 5 D C606B 7 D C532 5 D C607 6 C C533 5 B C608 6 D C534 5 B C609 6 A C535 5 B C611 7 D C536 5 D C612 6 A C537 5 D C701 3 D C538 7 B C702 3 D C539 5 C C703 3 D C540 5 C C704 3 B C541 5 C C705 3 D C542 5 C C706 3 B C543 5 C C707 3 D C544 5 C C708 3 D C545 5 C C709 3 B
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-51 Chapter 5 Troubleshooting
REF DESIG SHEET ZONE REF DESIG SHEET ZONE
Capacitors Cont. Ovens C710 3 D HR202 2 D C711 3 D HR202 3 C C712 7 B HR401 4 C C713 7 B HR701 3 B C714 3 D Lamps
Rectifiers I101 7 A CR101 5 C I102 7 A CR102 7 B I103 1 A CR801 7 C CR802 7 C Jacks J102 6 B
Test Points J103 1 A E208 1 B J104 1 A E209 2 B J105 1 C E210 3 A J106 1 A E211 3 B J107 1 A E212 1 B J110-B 7 B E213 1 B J116 5 C E402 4 A J208-8 7 A E607 6 D J208-A 3 A J208-D 2 D
Fuses J208-E 3 A F101 7 C J208-F 3 C F102 7 C J208-J 3 C F103 7 D J208-K 2 D J208C 1 D
Filters J217 3 B FL101 7 C J410-D 4 C FL502 5 A J410-E 4 C FL503 5 A J410-F 4 C FL504 5 A J410-H 4 C FL505 5 A J415 4 D FL601 6 C J416 4 C J417 4 C J512-10 5 D J512-11 5 D J512-12 5 C
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-52 Chapter 5 Troubleshooting
REF DESIG SHEET ZONE REF DESIG SHEET ZONE
Jacks Cont. J620-5 6 A J512-13 5 C J620-6 6 A J512-14 5 D J620-7 6 A J512-15 5 C J620-8 6 D J512-16 5 C J620-9 6 D J512-17 5 D J709-A 3 D J512-18 5 D J709-B 3 D J512-19 7 B J709-C 3 D J512-2 5 C J709-D 3 D J512-20 7 B J709-E 3 D J512-3 5 D J709-F 3 D J512-4 5 C J709-H 7 B J512-5 5 D J709-J 3 D J512-6 5 C J709-K 3 D J512-7 5 D J811-1 7 C J512-8 7 B J811-10 7 C J512-9 5 D J811-11 7 C J513 5 A J811-2 7 C J514 5 C J811-3 7 C J518 5 A J811-4 7 C J619-1 7 D J811-5 7 C J619-10 7 D J811-6 7 C J619-11 7 D J811-7 7 C J619-2 7 D J811-8 7 C J619-3 7 D J811-9 7 C J619-4 7 D J901-A 6 B J619-5 7 D J901-B 6 B J619-6 7 B J902-A 6 D J619-7 7 B J902-B 6 D J619-8 6 C J903-A 7 A J619-9 6 B J903-B 7 A J620-1 6 C J903-C 7 A J620-10 6 D J904 5 D J620-12 6 D J620-13 6 B J620-14 6 A Relays J620-15 6 A K101A 1 A J620-2 6 C K101B 1 A J620-3 6 C K601 6 C J620-4 6 C K601 7 B
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-53 Chapter 5 Troubleshooting
REF DESIG SHEET ZONE REF DESIG SHEET ZONE
Plugs P112-11 5 D P108-A 3 A P112-12 5 C P108-B 7 A P112-13 5 C P108-C 1 D P112-14 5 D P108-D 2 D P112-15 5 C P108-E 3 A P112-16 5 C P108-F 3 C P112-17 5 D P108-H 2 D P112-18 5 D P108-J 3 C P112-19 7 B P108-K 2 D P112-2 5 C P109-A 3 D P112-20 7 B P109-B 3 D P112-3 5 D P109-C 3 D P112-4 5 C P109-D 3 D P112-5 5 D P109-E 3 D P112-6 5 C P109-F 3 D P112-7 5 D P109-H 7 B P112-8 7 B P109-J 3 D P112-9 5 D P109-K 3 D P114 5 C P110-A 4 D P116 5 C P110-B 7 B P119-1 7 D P110-C 4 C P119-10 7 D P110-D 4 C P119-11 7 D P110-E 4 C P119-2 7 D P110-F 4 C P119-3 7 D P110-H 4 C P119-4 7 D P111-1 7 C P119-5 7 D P111-10 7 C P119-6 7 B P111-11 7 C P119-7 7 B P111-2 7 C P119-8 6 C P111-3 7 C P119-9 6 B P111-3 7 C P120-1 6 C P111-4 7 C P120-10 6 D P111-5 7 C P120-12 6 D P111-6 7 C P120-13 6 B P111-7 7 C P120-14 6 A P111-8 7 C P120-15 6 A P111-9 7 C P120-2 6 C P112-10 5 D P120-3 6 C
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-54 Chapter 5 Troubleshooting
REF DESIG SHEET ZONE REF DESIG SHEET ZONE
Plugs Cont. R121 1 A P120-4 6 C R124 7 A P120-5 6 A R201 1 D P120-6 6 A R202 1 D P120-7 6 A R203 1 D P120-8 6 D R204 1 D P120-9 6 D R205 2 B P205 1 C R206 3 A P206 1 A R207 2 D P207 1 A R208 2 B P215 4 D R209 2 B P221 2 B R210 2 D P416 4 C R211 2 D P417 4 C R212 2 B P513 5 A R213 3 A P518 5 A R214 3 A P717 3 B R215 3 A R216 3 A
Resistors R217 3 A R101 6 B R218 3 B R102 6 B R219 3 B R103 5 C R220 3 C R104 6 C R221 3 C R105 6 C R222 3 C R106 6 D R223 3 C R107 6 D R224 3 C R108 6 D R225 3 C R109 6 D R226 3 C R110 6 D R227 3 C R111 6 D R228 3 C R112 6 D R229 3 C R113 6 D R230 3 B R114 6 D R231 2 B R115 6 D R232 2 B R116 6 D R233 1 B R117 6 D R234 1 D R118 6 D R235 3 C R119 5 D R404 4 C R120 5 D R405 4 C
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-55 Chapter 5 Troubleshooting
REF DESIG SHEET ZONE REF DESIG SHEET ZONE
Resistors Cont. R543 5 C R406 4 R544 5 C R407 4 D R545 5 C R501 5 A R546 5 C R502 5 A R547 5 C R503 5 A R548 5 C R504 5 A R549 5 C R505 5 A R550 5 B R506 5 A R551 5 B R507 5 A R552 5 C R508 5 A R553 5 B R511 5 B R554 5 B R512 5 B R601 6 A R513 5 B R602 6 A R514 5 B R603 6 A R515 5 B R604 6 A R516 5 B R605 6 A R518 5 B R606 6 A R519 5 B R607 6 C R520 5 B R608 6 C R521 5 B R609 6 A R522 5 D R610 6 A R523 5 D R611 6 B R524 5 D R612 6 A R525 5 B R613 6 B R526 5 D R614 6 B R527 5 D R615 6 B R528 5 B R617 7 D R529 5 B R618 7 D R530 5 B R619 7 D R531 5 B R620 6 C R532 5 D R621 6 C R533 5 D R622 6 A R534 5 D R623 6 D R535 5 D R624 6 D R536 7 B R625 6 D R537 5 D R626 6 C R538 5 C R627 6 C R539 5 C R701 3 D R540 5 C R702 3 D R541 5 C R703 3 D R542 5 C R704 3 B
D
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-56 Chapter 5 Troubleshooting
REF DESIG SHEET ZONE REF DESIG SHEET ZONE
Ballast Tube Transformers RT510 7 B T201 1 A T202 1 A
Switches T203 1 A S101 5 D T204 1 A S102 7 C T205 1 C S102F 5 C T206 1 C S102R 5 D T207 2 D S103 7 D T208 3 B S104 6 A T401 4 B S105 6 D T501 5 B S106 7 B T502 5 B S107 5 C T503 5 D S108 5 D T601 6 B S201 1 A T602 6 D S202 1 C T701 3 B S203F 1 D T801 7 C S203R 1 D S204F 1 B Terminal Blocks S204R 1 B TB102-1 5 C S205 1 D TB102-2 5 C S206 2 A TB102-3 5 C S207 2 B TB102-4 5 C S208F 2 D TB102-5 5 C S208R 2 D TB102-6 6 B S401 4 A TB102-7 6 B S402 4 B TB102-8 6 B S403 4 C TB103-9 7 C S501 5 A TB103-10 6 D S502F 5 A TB103-11 6 D S502R 5 A TB103-12 6 D S503F 5 A TB103-13 6 D S503R 5 A TB103-14 5 D S701 3 D TB103-15 5 D TB103-16 5 D TB103-16 7 A
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-57 Chapter 5 Troubleshooting
REF DESIG SHEET ZONE REF DESIG SHEET ZONE
Tubes Crystals V201 (6DC6) 1 B Y201 17 MHz 2 D V202 (6C4) 2 B Y203 200 kHz 3 C V203 (6C4) 3 A Y401 10 MHz 4 A V204 (6C4) 3 B Y402 10.5 MHz 4 A V205A (5814) 3 C Y403 11 MHz 4 A V205B 3 C Y404 11.5 MHz 4 A V206 (5814) 2 D Y405 12 MHz 4 A V207 (5654) 4 A Y406 12.5 MHz 4 A V401 (5654) 5 A Y407 13 MHz 4 A V501 (5749) 5 A Y408 8 MHz 4 A V502 (5749) 5 B Y409 14 MHz 4 A V503 (5749) 5 B Y410 15 MHz 4 A V504 (6AK6) 5 D Y411 16 MHz 4 A V505 (5749) 5 B Y412 17 MHz 4 A V506A (5814) 5 C Y413 9.5 MHz 4 A V506B 5 D Y414 14.5 MHz 4 A V507 (5654) 5 D Y415 15.5 MHz 4 A V508 (5749) 5 C Y501 455 kHz 5 A V509A (5814) 5 C V509B 5 C Assemblies V601A (5814) 6 A Z201-1 2 A V601B 6 C Z201-2 2 A V602A (5814) 6 A Z202-1 2 A V602B 6 C Z202-2 2 A V603 (6AK6) 6 B Z203-1 2 A V604 (6AK6) 6 D Z203-2 2 A V605 (OA2) 7 D Z204-1 2 C V701 (3TF7) 3 B Z204-2 2 C
7 C Z205-1 2 C V802 (26Z5) 7 C Z205-2 2 C Z206-1 2 C
Z206-2 2 C Z213-1 2 B
Z213-2 2 B Z213-3 2 B Z216-1 3 A
Z216-2 3 A Z216-3 3 A
Z501 5 A Z502 5 B
Z503 5 C Z702 3 B
V801 (26Z5)
The 21st Century R-390A/URR Reference Y2K-R3
July 2009 Page 5-58 Chapter 5 Troubleshooting
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