TB 9-2920-225-34-1

DEPARTMENT OF THE ARMY TECHNICAL BULLETIN

100 AMP REGULATOR

(SOLID STATE)

NSN 2920-00-900-7993

CHECKOUT AND REPAIR PROCEDURES

HEADQUARTERS, DEPARTMENT OF THE ARMY

10 NOVEMBER 1981

T E C H N I C A L B U L L E T I N

No. 9-2920-225-34–1

TB 9-2920-225-34-1

HEADQUARTERSDEPARTMENT OF THE ARMY

WASHINGTON , DC, 10 November 1981

100 AMP REGULATOR

(SOLID STATE)(NSN 2920-00-900-7993)

CHECKOUT AND REPAIR PROCEDURES

REPORTING OF ERRORSReporting Errors and Recommending Improvements. You can help improvethis bulletin. If you find a mistake or if you know of away to improve theprocedures, please let us know. Mail your letter, DA Form 2028 (Recom-mended Changes to Publications and Blank Forms), or DA Form 2028-2located in the back of this bulletin to: US Army Tank-Automotive Com-mand, ATTN: DRSTA-MB, Warren, MI 48090. A reply will be furnisheddirect to you.

ParagraphCHAPTER 1. INTRODUCTION

Section I. General_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 1-1II. Fundamentals of Solid State Component Checkout and Repair _ _ _ _ _ _ _ _ _ _ _ _ _ 1-6

CHAPTER 2. VAP-AIR MODELSSection I. Introduction_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 2–1

II. Vap-Air Model 26440001-01 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 2-4

IV. Vap-Air Model 26440001-04 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 2-8V. Vap-Air Model 26440001-05 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 2-10

CHAPTER 3. LEECE-NEVILLE MODELSSection I. Introduction _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 3-1

II. Leece-Neville Model R0015027RA _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 3-4III. Leece-Neville Model R0015027RB_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 3-6IV. Leece-Neville Model R0015027RC _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _3–8V. Leece-Neville Model R0015027RD _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _3-10

CHAPTER 4. LELAND AIRBORNE MODELI n t r o d u c t i o n _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 4 - 1

5. 100 AMP REGULATOR CHECKERPurpose__________________________________________________________5-1

APPENDIX A. CONSOLIDATED NATIONAL STOCK NUMBERS (NSN) AND FEDERALSUPPLY CODES FOR MANUFACTURERS (FSCM) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

LIST OF ILLUSTRATIONS

Figure Title1-1 100 AMP regulator ____________________________________________________________________2-1 NPN transistor (Vap-Air) _________________________________________________________________2-2 Transistor resistance checks (Vap-Air) _______________________________________________________2-3 Vap-Air mode126440001-0l ___________________________________________________________2-4 Diode mounting—model 01 _______________________________________________________________2-5 Vap-Air model 26440001-03_______________________________________________________________2-6 End view—mode103____________________________________________________________________

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2-12-32-52-132-22

3-13-33-73-93-15

4-1

5-1

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Figure

2–72-82-92-102-112-122-132-142-152-162-172-182-192–202-212-222-233-13–23-33–43-53-63-73-83-93-103-113-123-133-143-154-14-24-35-1

Table

2-12-22-32-42-52-62-72-82-92-103-13-23–33-43-53-64-1

Title

Circuit board—model 03_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Test points–model 03___________________________________________________________Schematic diagram—model 03______________________________________________________Vap-Air model 26440001-04______________________________________________________________End view—model 04____________________________________________________________________Diode mounting—model 04________________________________________________________________Relay location—model 04_________________________________________________________________Circuit board and transistor heat sink-model 04___________________________________________________Test points—model 04_________________________________________________________Schematic diagram—model 04_____________________________________________________________Vap-Air model 26440001-05 ______________________________________________________________End view—model 05 _____________________________________________________________________Diode mounting—model 05________________________________________________________________Relay location—model 05 _________________________________________________________________Circuit board and transistor heat sink—model 05 ________________________________________________Test Points-model 05_____________________________________________________________________Schematic diagram—mode1 05_____________________________________________________________NPN transistor (Leece-Neville)______________________________________________________________ Transistor resistance checks (Leece-Neville)____________________________________________________Top view (Leece-Neville)—model 5027RA____________________________________________________Circuit board—model 5027RA_____________________________________________________________Schematic diagram—mode1 5027RA_________________________________________________Leece-Neville model 5027RB exploded view___________________________________________________Openview—mode15027RB____________________________________________________________Leece-Neville model 5027RC exploded view_________________________________________________Openview—mode15027RC______________________________________________________Circuit board—mode15027RC______________________________________________________________Schematic diagram—mode1 5027RC_____________________________________________Leece-Neville mode15027RD______________________________________________________________Circuit board removed—mode1 5027RD_____________________________________________________Test points-model 5027RD ________________________________________________________________Schematic diagram—mode15027RD_________________________________________________________NPN transistor (Leland Airborne Model)_______________________________________________________Transistor resistance checks (Leland Airborne Model) ____________________________________________Schematic diagram, circuit board, and bracket assy (Leland Airborne model)_____________________________100 AMP solid state regulator checker_________________________________________________________

LIST OF TABLES

Title

Replacement Parts List-Model 01___________________________________________________________Resistance Checks (Power-off)-Model 03_____________________________________________________Voltage Checks (Power on)—Mode103_____________________________________________Substitutes for Diode D1–Model 03________________________________________________________Resistance Checks (Power otO—Mode104____________________________________________________Voltage Checks (Power on)—Mode1 04_______________________________________________________Substitutes for transistor Q5-Model 04________________________________________________________Resistance Checks(Power off)–Model 05_______________________________________________________VoltageChecks (Power on)—Mode1 05___________________________________________________Substitutes for transistor Q5—Model 05____________________________________________________Resistance Checks (Power off)-Mode15027RA________________________________________________V o l t a g e C h e c k s ( P o w e r o n ) — M o d e 1 5 0 2 7 R A _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Resistance Checks (Power off) —Mode15027RC________________________________________V o l t a g e C h e c k s ( P o w e r o n ) — M o d e 1 5 0 2 7 R C _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Resistance Checks (Power off) —Mode15027RD_________________________________________________S u b s t i t u t e s f o r D i o d e Z 1 - M o d e l 5 0 2 7 R D _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Replacement Parts List-Leland Airborne Model_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Page

2-82-92-102-142-152-172-182-192-202-212-232-242-252-262-272-282-293-23-23-33-43-53-83-93-103-113-123-133-163-183-193-204-24-24-35-2

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2-32-112-122-182-152-162-182-303-302-31

3-63-143-143-173-174-4

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TB 9-2920-225-34-1

CHAPTER 1

INTRODUCTION

Section I.

1-1. Scope. These procedures are applicable toDirect Support and General Support levels. Theinstructions are limited to the model described,but may also aid in repairing other 100 AMPregulator (Solid State) models which may be inuse. Repair beyond that covered is permissible iftime and skills are available.

1-2. Purpose. This bulletin describes the checkoutand repair procedures for the 100 AMP regulator(Solid State), NSN 2920-00-900-7993.

1-3. General. a. The 100 AMP (Solid State) regu-lator, NSN 2920–00–900–7993, procured under amilitary standard performance-type specification.As such, the design and detail drawings are pro-prietary to each of the manufacturers and arenot available. At present, there are three suppliersof the regulators:

(1) Leece-Neville.Code Ident 35510 (FSCM)Sheller-Glove Corp.Leece-Neville Cleveland Div.1374 E. 51 St.Cleveland, OH 44103Telephone AC 216 431–0740

(2) DC Electronics.Successors in 1978 to Vap-AirCode Ident 34904 (FSCM)DC Electronics Inc.544 N. Highland Ave.Aurora, IL 60506Telephone AC 312844-5170

(3) Leland Electrosystems Inc.Code Ident 07639 (FSCM)Leland Electrosystems Inc.740 E. National RoadP.O. Box 128Vandalia, OH 45377Telephone AC 513898-5881

b. The 100 AMP regulator was originally desig-nated as non-repairable. However, since fielding,the regulator has consistently appeared as a backorder item. This bulletin is provided as an interim

GENERAL

solution to this problem, until maintenance andprovisioning studies are finalized, at which timepertinent information may be incorporated inTM 9–2920-225-34 and TM 9–2920–225-34P. The100 AMP regulator is illustrated in figure l–l.

c. This bulletin contains instructions for therepair of nine different models which are describedin the chapters listed below:

Chapter 2 Vap-Air (four models)Chapter 3 Leece-Neville (four models)Chapter 4 Leland Airborne (one model)

For simplicity, the regulator model numbers areabbreviated with a portion of the last digits e.g.,Vap-Air model 26440002–05 is abbreviated asmodel 05, Leece-Neville model R0015027RA is ab-breviated as model 5027RA.

d. A 100 AMP regulator checker is described inchapter 5. In addition, TB 9–2300-409-30, (Gen-erator System Tester (Go/No-Go), provides fabri-cation instructions for a regulator test stand.

e. Replacement parts which are not identicalwith the original parts may cause a change in per-formance of the regulator. The repair facilityshould remain aware of this possible performancechange and use substitute parts with reasonablecaution. Replacement parts should be obtainedwith the following priorities:

(1) Where parts are available in the supplysystem, the stock number is provided.

(2) Where no stock number is available, thepart should be either obtained from a non-repair-able regulator (cannibalization) or ordered fromthe manufacturer.

(3) Appendix A lists all National Stock Num-bers (NSNS) in ascending National Item Iden-tification Number (NIIN) sequence for quickreferral to the Federal Supply Code for Manufac-turer ( FSCM). Addresses for FSCMS are listed inSB 708-41/42.

(4) When all else fails, try a substitute partand monitor the performance of the repairedregulator.

1-1

TB 9-2920-225-34-1

Figure 1–1. 100 AMP regulator.

1-4. Removal and Installation. The regulator 1-5. Major Items Affected. Because of the nu-must be removed from the vehicle for testing and merous vehicles affected, a listing of the vehiclesrepair. The procedures given in this bulletin are will not be supplied. Check the regulator’s NSNfor bench testing and repair only. Refer to the ap- (2920-00-900-7993) or part number (10947439)propriate vehicle manual for removal and instal- in section IV of your vehicle’s repair parts manuallation procedures for your particular vehicle. for applicability.

Section II. FUNDAMENTALS OF SOLID STATE COMPONENT CHECKOUT AND REPAIR

1-6. Introduction. a. Checkout and repair of solidstate voltage regulators involves techniques dif-ferent from those employed with mechanical volt-age regulators.

b. Before attempting checkout and repair ofsolid state voltage regulators, follow the instruc-tions of paragraphs 1–7 and 1–8,

1-7. Meters. a. The type of meter used to check-out solid state components is critical and shouldbe limited to quality meters such as the TS-352 orthe Simpson 260 multimeters, or their equivalent.When using an ohmmeter with unknown technicalspecifications or characteristics, the followingchecks can be made to determine if the ohmmeterscales will cause damage to low power transistors.

(1) Check the voltage across the ohmmeterleads as the ranges are switched. No scale shouldbe used if the voltge exceeds 3 volts.

(2) If the instrument is a combination volt-ohmmeter, the positive voltmeter lead may notbe the positive ohmmeter lead. The polarity of theohmmeter leads must be known. Polarity can bedetermined by connecting the ohmmeter to avoltmeter. If the voltmeter moves up scale theohmmeter has the same polarity as the voltmeter.

1-2

If the voltmeter attempts to move down scale theohmmeter leads have opposite polarity, e.g., TS–352 multimeter. If necessary mark the ohmmeterleads positive and negative for reference.

b. The ohmmeter readings obtained when check-ing semiconductor devices depends on the internalmakeup of the meter, scale used, type of transistorand its temperature. Therefore, exact resistancereadings are seldom given. Readings are usuallyreferred to as low resistance, which is less than 20ohms; and high resistance which is more than 200ohms. Occasional failures may occur which canbe detected by these tests. If readings obtained aredoubtful or operation of the regulator is notproper, replace the transistors.

1-8. DOs AND DON’Ts For Circuit Repair.a. DO—When replacing solid state circuit

boards, clip the connecting wires, leaving a smallportion of wire with insulation to act as a refer-ence for connecting points on the replacementboard.

b. DON’T—Attempt to interchange circuitboards between regulator models.

c. DO—Use high quality resin core solder of60–40 tin lead composition.

TB 9-2920-225-34-1

d. DO—Use a 60W AC or DC soldering iron.Solid state components are easily damaged by ex-cessive heat.

e. DON’T—Allow wires to become pinched be-tweencovers, heat sinks, circuit boards, etc.

f. DON’T—Use a screwdriver to pry up transis-tors during removal. The mica washer between thetransistor and the circuit board or heat sink is thinand can be easily damaged.

g. DON’T—Drop transistors since they areeasily damaged. If a transistor is dropped it shouldbe checked before being installed in the circuit.

h. DO—Check transistor insulating washers

and replace if cracked, broken, or missing. Coatwashers with insulation compound (silicone) perMIL-S-8660, NSN 6850–00–880–7616.

i. DO—After repair, remove all excess solder.Check for loose wires, screws, and washers whichcould cause short circuits and burnouts whenpower is applied to the regulator.

j. DO—Check the regulator cover seal, replaceif cracked or missing. Coat the seal with insula-tion compound (silicone) per MIL-S-8660, NSN6850-00–880–7616.

k. DO—Apply adhesive 8040–877–9872 to theadjustment access plug or screw.

.

1-3

TB 9-2920-225-34-1

CHAPTER 2

VAP-AIR MODELS

Section I. INTRODUCTION

2-1. Introduction. Four models were produced byVap-Air, a division of Vapor Corporation.

Code Ident 80234 (FSCM)Vapor Corp.6420 W. Howard St.Chicago, IL 60648

In 1978, the voltage regulator product line wassold to DC Electronics Corporation.

Code Ident 34904 (FSCM)DC Electronics Inc.544 N. Highland Ave.Aurora, IL 60506

TELEPHONE AC 312844-5170DC Electronics now provides parts and engineer-ing support for all Vap-Air models. The Vap-Airpart numbers for each model are:

26440001-0126440001–0326440001-0426440001-05

2-2. General Inspection. This chapter applies toall Vap-Air models.

a. Regulator Box Assembly (external). Checkfor missing or stripped cover, connector mount,retainer screws, and voltage adjustment accessplug.

Check connectors for signs of arcing, bent, orpushed in pins, broken connectors, and threaddamage. Correct deficiencies by utilization of serv-iceable components from unrepairables or requisi-tioning components from the manufacturer.

(1) The pin receptacle (J2) is P/N 7064706FSCM 19207 or MS3102A28-22P FSCM 96906per MIL-C-5015.

(2) The socket receptacle (Jl) is P/N 7064-706 FSCM 19207, an Army number for which

there is no equivalent NSN number. An assemblyis available from Bendix.

CODE IDENT 77820 (FSCM)Bendix Corp.The Electrical Components

Div.Sherman Ave.Sidney, NY 13838

It should be ordered as part number 60–42228-10S; it will arrive as a complete assembly withthe shell marked 8701337.

b. Regulator Box Assemblly (internal). If waterleakage or corrosion is detected, it is possible thatextensive damage has been done and the regulatorcannot be easily repaired. Components should beperformance tested and retained if acceptable.Check for disconnected or burnt wires, missingcomponents, and replace repair as necessary.Carefully remove the transistor mounting plate,noting the position of the screws, washers andrubber insulators. Visually inspect the circuitboard for burnt components. Replace the circuitboard through cannibalization if burnt compo-nents are found. Carefully reinstall the transistormounting plate.

c. Regulator Verification Check. After perform-ing the above inspection, if the regulator appearsto be in good condition, check its performance ona test stand. If the regulator fails this check, pro-ceed to the following component tests.

2-3. Bench Testing. Figures 2–1 and 2–2 show themethod for testing NPN transistors; these figuresapply to all models in this chapter. If the originaltransistors are replaced with substitute part num-bers, the repaired regulators should be carefullytested to ensure proper operation.

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Figure 2-1. NPN tranistor (Vap-Air).

Figure 2-2. Transistor resistance checks (Vap-Air).

2-2

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Section II. VAP-AIR MODEL 26440001-01

2-4. General. Figures 2–3 and 2–4 show two viewsof the regulator and its parts. Diode and transistorNSNS and parts numbers with substitute NSNSand part numbers are listed in table 2–1.

2-5. Checkout and Repair.a. Voltage Adjustment Rheostat (R6) (power

disconnected).(1) Remove voltage adjustment access plug

(see fig. 2-3).(2) Place ohmmeter test probes to terminals

of the rheostat (see fig. 2-3).(3) Rotate rheostat fully clockwise; reading

should be less than 5 ohms.(4) Rotate rheostat fully counterclockwise;

reading should be approximately 2500 ohms.(5) If other readings are obtained, replace

rheostat.b. Transistors.

(1) Carefully remove transistors Q7, Q8, andQ9 (see fig. 2-3).

(2) Position transistor as shown in figure2-1, and check each separately (see fig. 2-2).

(3) If resistance values differ from the valuesshown in figure 2–2, replace the transistor ac-cording to table 2–1.

NOTETransistors Q8 and Q9 are identical andcan be interchanged. Transistors Q7must be replaced by a like item in thesame socket (see fig. 2-3 ).

(4) Check the mica insulating washer be-tween the transistor and mounting plate. Replaceif cracked, broken, or missing. Coat washers withinsulation compound per MIL-S-8660, NSN 6850–00–880-7616.

c. Diode.(1) Remove four screws holding transistor

mounting plate and move plate to one side.(2) Place negative ohmmeter probe to the

connector side of diode CR6 (see fig. 2–3).(3) Place positive probe to the circiut board

side of CR6. Meter should indicate low resistance.(4) Reverse probes. Meter should indicate

high resistance.

(5) If other readings are obtained, replacediode CR6 (MR1122), NSN 5961–00-103–1519(see fig. 2-4).

(6) Reinstall transistor mounting plate.

d. Circuit Board. If no faulty components weredetected after performance tests a, b, and c above,replace the circuit board.

e. Functional Check. Check the performance ofthe regulator on the test stand and make finalvoltage adjustments. Voltage output should read28 volts. If the regulator does not function prop-erly, perform the following:

(1) Check wires and connections.(2) Replace circuit board.(3) Perform bench test procedures.

NOTE

After final repair, checkthe test stand.

If the regulator still does not

regulator on

function correctlyit will be necessary, if local skills permit, to testeach component. All the parts should be checkedwith an ohmmeter and the capacitors checkedwith a capacitance meter. The circuit board tracesshould be checked with an ohmmeter to makesure that there are no cracked traces. Traces withhairline cracks will show good at lower tempera-tures and will tend to show open circuit at highertemperatures. If the board seems good at roomtemperature, but the regulator still fails, thiscould be the cause.

Table 2–1. Replacement Parts List—Model 01

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2-4

Figure 2~3. Vap-Air model 26440001-01.

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Figure 2–4. Diode mounting-model 01.

Section III. VAP-AIR MODEL 2640001-03

2-6. General. Figure 2–5 is a plan view of the view of the circuit board. Figure 2–8 is a view ofregulator with the cover off. Figure 2–6 is an end the circuit board showing some of the electricalview of the regulator showing the voltage adjust- test points. There are 21 electrical test points.ment point and some test points. Figure 2–7 is a Figure 2–9 is an electrical schematic diagram of

2-5

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Figure 2–5. Vap-Air model 26440001-03.

2–6

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Figure 2–6. End view-model 03.

the regulator. Table 2–2 gives the resistancechecks, and table 2–3 gives the voltage checks.Table 2–4 is a diode substitution list.

2-7. Checkout and Repair.

a. Voltage Adjustment Rheostat (R6) (powerdisconnected).

(1) Remove voltage adjustment access plug(see fig. 2-5).

(2) Place ohmmeter test probes to terminalsof the rheostat (see fig. 2–5).

(3) Rotate rheostat. fully clockwise; readingshould be less than 5 ohms.

(4) If other readings are obtained, replacerheostat with Vap-Air part number 26527097.

b. Transistors.(1) Carefully remove transistors Q7, Q8, and

Q9 (see fig. 2-5).(2) Position transistors as shown in figure

2–1 and check each separately (see fig. 2-2).(3) If resistance values differ from the

values shown in fig. 2–2, replace the transistorwith a new device. Q7 is Vap-Air part number26316033–19; Q8 and Q9 are Vap-Air part num-ber 26316033-20.

NOTE

Transistors Q8 and Q9 are identical andcan be interchanged. Transistor Q7 mustbe replaced by a like item in the samesocket (see fig. 2–5).

(4) Check the mica insulating washers be-tween the transistors and mounting plate. Replaceif cracked, broken or missing. Coat washers withinsulation compound per MIL-S-8660, NSN 6850-00-880-7616.

c. Diode.(1) Remove four screws holding transistor

mounting plate and move plate to one side.(2) Place negative ohmmeter probe to the

connector side of diode D5 and D6, individually(see figs. 2-5 and 2-9).

(3) Place positive probe to the circuit boardside of D5 and D6, individually. Meter should in-dicate high resistance.

(4) Reverse probes. Meter should indicatelow resistance.

(5) If other readings are obtained, replacediodes D5 and D6, NSN 5961–00–103–1519 (seefig. 2-5).

(6) Reinstall transistor mounting plate.

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Figure 2-7. Circuit board–model 03.

2-8

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Figure 2-8. Test points–model 03.

d. Relay.(1) Place ohmmeter probes across relay coil

terminals (see fig. 2-5). Meter should read ap-proximately 60 ohms.

(2) Place ohmmeter probes across contactorterminals (see fig. 2-5). Meter should read infinity(open circuit ).

(3) If other readings are obtained, replacerelay with NSN 2920-00-735–9542.

e. Detailed Circuit Checks.(1) Table 2-2 contains “power off” resist-

ance checks of the circiut (see figs. 2–6 and 2–8for test points).

(2) Table 2-2 contains “power on” voltagechecks of the circuit (see figs. 2-6 and 2-8 for testpoints).

f. Functional Check. Check the performance ofthe regulator on the test stand and make finalvoltage adjustments. Voltage output should read28 volts. If the regulator does not function prop-erly, perform the following:

(1) Check wires and connections.

2-9

Figure 2-9.

TB

9-2920-225-34-1

2-10

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Table 2-2. Resistance Checks (Power Off) — Model 03

2-11

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(2) Replace circuit board, Vap-Air part num- NOTEber 26644321.

(3) Perform bench test procedures.

Table 2-3. Voltage Checks (Power On)–Model 03

After final repair, check regulator on thetest stand.

2-12

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Table 2-4. Substitutes for D1-Model 03 If the regulator still does not function correctlyit will be necessary, if local skills permit, to testeach component. All the parts should be checkedwith an ohmmeter and the capacitors checked witha capacitance meter. The circuit board tracesshould be checked with an ohmmeter to make surethat there are no cracked traces. Traces with hair-line cracks will show good at lower temperaturesand will tend to show open circuit at higher tem-peratures. If the board seems good at room tem-perature, but the regulator still fails, this couldbe the cause.

Section IV. VAP-AIR MODEL 26440001-04

2-8. General. Figure 2-10 is a plan view of theregulator with the cover off. Figure 2-11 is anend view of the regulator showing the receptaclesand the voltage adjustment points. Figure 2–12 isan exploded view of the diode mounting. Figure2–13 is a relay location. Figure 2–14 is a view ofthe circuit board and transistor heat sink. Figure2–15 is a view of the circuit board showing theelectrical test points. There are 12 electrical testpoints. Figure 2–16 is an electrical schematic dia-gram of the regulator. Table 2–5 lists the resist-ance checks, and table 2-6 1ists the voltage checks.Table 2–7 is a transistor substitution list.

2-9. Checkout and Repair.a. Voltage Adjustment Rheostat (Rz) (Power

Disconnected).(1) Place ohmmeter test probes to terminals

of the rheostat (see fig. 2-10).(2) Rotate rheostat fully clockwise, reading

should be approximately 250 ohms.(3) Rotate rheostat fully counterclockwise,

reading should be less than 5 ohms.(4) If other readings are obtained, replace

rheostat.

b. Transistors.(1) Remove transistors Q4 and Q5 (see fig.

2–l0).(2) Position transistors as shown in figure

2-1, and check them separately (see fig. 2–2).(3) If resistance values cliffer from the values

shown in figure 2–2, replace the transistorsthrough cannibalization or requisition transistorQ4, Vap-Air part number 26316033-12 (2N3441),NSN 5961–00–054–4141, or transistor Q5, Vap-Air P N 26316033–70 (2N3773), NSN 5961–00–929–5014 (see table 2–7 for substitutes).

(4) Check the mica insulating washers be-tween the transistors and mounting plate. Replace

if cracked, broken or missing. Coat washers withinsulation compound per MIL–S–8660, NSN 6850–00-880-7616.

c. Diode.(1) Remove four screws holding transistor

and circiut board mounting plate, and move plateto one side.

(2) Place negative ohmmeter probe to thetopside of diode D4 (see fig. 2-12).

(3) Place positive probe to the bottom of D4.Meter should indicate low resistance.

(4) Reverse probes. Meter should indicatehigh resistance.

(5) If other readings are obtained replacediode D4 (MR1122), NSN 5961–00–103–1519 (seefig. 2-12) .

d. Relay.(1) Place ohmmeter probes across relay coil

terminals (see fig. 2-13).(2) Place ohmmeter probes across terminals

(see fig. 2-13). Meter should read infinity (opencircuit).

(3) If other readings are obtained, replacerelay, NSN2920–00–735–9542.

(4) Reinstall transistor and circuit boardmounting plate.

e. Detailed Circuit Checks.(1) Table 2–5 contains “power off’’ resistance

checks of the circuit (see fig. 2–15 for test points).(2) Table 2-6 contains “power on” voltage

checks of the circuit (see fig. 2–15 for test points).

f. Functional Check. Check the performance ofthe regulator on the test stand and make final volt-age adjustments. Voltage output should read 28volts. If the regulator does not function properly,perform the following:

( 1 ) Check wires and connections.

2-13

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Figure 2-10. Vap-Air model 26440001-04.

2-14

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Figure 2-11. End view—model 04.

(2) Replace circuit board, Vap-Air part num-ber 27134372. After final repair, check regulator on the

(3) Perform bench test procedures. test stand.

NOTE

Table 2–5. Resistance Checks (Power Off)–Model 04

2-15

TB 9-2920-225-34-1

Table 2-5. Resistance Checks (Power Off)–Model 04–continued

Table 2-6. Voltage Checks (Power 0n)—Model 04

2-16

TB 9-2920-225-34-1

Figure 2-12. Diode mounting-model 04.

2-17

TB 9-2920-225-34-1

Table 2-7. Substitutes for transistor Q5–.Model O4

2-18

Figure 2-13. Relay location-model 04.

Table 2-7. Substitutes for transistor Q5–Model 04—continued

If the regulator still does not function correctlyit will be necessary, if local skills permit, to testeach component. All the parts should be checkedwith an ohmmeter and the capacitors checkedwith a capacitance meter. The circuit board tracesshould rechecked with an ohmmeter to make surethat there are no cracked traces. Traces with hair-line cracks will show good at lower temperaturesand will tend to show open circuit at higher tem-peratures. If the board seems good at room tem-perature, but the regulator still fails, this couldbe the cause.

TB 9-2920-225-34-1

Figure 2-14. Circuit board and transistor heat sink–model 04.

2-19

TB 9-2920-22-34-1

Figure 2–15. Test points–model 04.

2-20

Figure 2-16.

TB

9-2920-225-34-1

2-21

TB 9-2920-225-34-1

Section V. VAP-AIR MODEL 26440001-05

2-10. General. Figure 2–17 is a plan view of theregulator with the cover off. Figure 2–18 is theend view of the regulator showing the receptaclesand the voltage adjustment point. Figure 2-19 isan exploded view of the diode mounting. Figure2-20 is a relay location drawing. Figure 2-21is a view of the circuit board and transistor heatsink. Figure 2–22 is a view of the circuit boardshowing the electrical test points. There are 12electrical test points. Figure 2–23 is an electricalschematic diagram of the regulator. Table 2–8lists the resistance checks. Table 2-9 lists thevoltage checks. Table 2-10 is a transistor substi-tution list.

2-11. Checkout and Repair.

a. Voltage Adjustment Rheostat (R2) (powerdisconnected).

(1) Place ohmmeter test probes to the violetand brown wire terminals of the rheostat (seefig. 2-17) .

(2) Rotate rheostat fully clockwise, readingshould be approximately 250 ohms.

(3) Rotate rheostat fully counterclockwise,reading should be less than 5 ohms.

(4) If other readings are obtained, replacerheostat.

b. Transistors.(1) Remove transistors Q4 and Q5 (see fig.

2-17).(2) Position transistors as shown in figure

2-1, and check each separately (see fig. 2–2).(3) If resistance values differ from the

above, replace the transistors through cannibaliza-tion or requisition transistor Q4, Vap-Air partnumber 26316033-12 (2N3441), NSN 5961-00–054-4141, or transistor Q5, Vap-Air part num-ber 26316033–70 (2N3773), NSN 5961-00–929–5014 (see table 2–10 for substitutes).

(4) Check the mica insulating washers be-tween the transistors and mounting plate. Re-place if cracked, broken or missing. Coat washerswith insulation compound per MIL-S-8660, NSN6850–00–880-7616.

c. Diode.(1) Remove four screws holding transistor

and circuit board mounting plate, and move plateto one side.

(2) Place negative ohmmeter probe to thetop side of diode CR3 (see fig. 2-19).

2-22

(3) Place positive probe to the bottom sideof CR3. Meter should indicate low resistance.

(4) Reverse probes. Meter should indicatehigh resistance.

(5) If other readings are obtained replacediode CR3 (MR1122), NSN 5961-00-103-1519(see fig. 2-19).

d. Relay.(1) Place ohmmeter probes across relay coil

terminals (see fig. 2–20 ). Meter should read ap-proximately 60 ohms.

(2) Place ohmmeter probes across contactorterminals (see fig. 2–20). Meter should readinfinity (open circuit ).

(3) If other readings are obtained, replacerelay, Vap-Air part number 27124377, NSN 2920-00–735-9542.

(4) Reinstall transistor and circuit boardmounting plate.

e. Detailed Circuit Checks.(1) Table 2-8 contains “power off” resist-

ance checks of the circuit (see fig. 2–22 for testpoints).

(2) Table 2–9 contains “power on” voltagechecks of the circuit (see fig. 2–22 for test points).

f. Functional Checks. Check the performanceof the regulator on the test stand and make finalvoltage adjustments. Voltage output should read28 volts. If the regulator does not function prop-erly, perform the following:

(1) Check wires and connections.(2) Replace circuit board, Vap-Air part

number 27534930.(3) Perform bench test procedures.

NOTE

After final repair, check regulator onthe test stand.

If the regulator still does not function correctlyit will be necessary, if local skills permit, to testeach component. All the parts should be checkedwith an ohmmeter and the capacitors checked witha capacitance meter. The circuit board tracesshould be checked with an ohmmeter to makesure that there are no cracked traces. Traces withhairline cracks will show good at lower tempera-tures and will tend to show open circuit at highertemperatures. If the board seems good at roomtemperature, but the regulator still fails, thiscould be the cause.

TB 9-2920-225-34-1

Figure 2-17. Vap-Air model 26440001–05.

2-23

TB 9-2920-225-34-1

2-24

Figure 2-18. End view–model 05.

TB 9-2920-225-34-1

Figure 2-19. Diode mounting—model 05.

2-25

TB 9-2920-225-34-1

Figure 2-20. Relay location—model 05.

2-26

TB 9-2920-225-34-1

Figure 2–21. Circuit board and transistor heat sink–model 05.

2-27

TB 9-2920-225-34-1

Figure 2–22. Test point–model 05.

2-28

Figure 2-23.

TB

9-2920-225-34-1

2-29

TB 9-2920-225-34-1

Table 2-8. Resistance Checks (Power Off)—Model 05

Table 2-9. Voltage Checks (Power On)—Model 05

2-30

TB 9-2920-225-34-1

Table 2–9. Voltage Checks (Power On)—Model 05–continued

Table 2-10. Substitutes for Transistor Q5—Model 05

2-31

TB 9-2920-225-34-1

CHAPTER 3

LEECE-NEVILLE MODELS

Section I. INTRODUCTION

3-1. Introduction. Four models were produced byLeece-Neville, a division of Sheller Globe Corpora-tion.

Code Ident 35510 (FSCM)Sheller Globe Corp.Leece-Neville Cleveland Div.1374 E. 51st St.Cleveland, OH 44103

TELEPHONE AC 216 431–0740

The Leece-Neville part numbers for each modelare:

R0015027RAR0015027RBR0015027RCR0015027RD

3-2. General Inspection. This chapter applies toall Leece-Neville models.

a. Regulator Box Assembly (external). Checkfor missing or stripped cover, connector andmount retainer screws, and voltage adjustmentaccess plug. Check connectors for signs of arcing,bent or pushed in pins, broken connectors andthread damage.

Correct deficiencies by utilization of serviceablecomponents from unrepairables or requisitioningcomponents from the manufacturer.

(1) The pin receptacle (J2) is P/N 7064429FSCM 19207 or MS3102A28-22P FSCM 96906per MIL-C-5015.

(2) The socket receptacle (Jl) is P/N7064706 FSCM 19207, an ordnance number forwhich there is no equivalent NSN number. An

assembly is available as an ordnance part fromBendix.

Code Ident 77820 (FSCM)Bendix Corp.The Electrical Components Div.Sherman Ave.Sidney, NY 13838

It should be ordered as part number 60-42228-10S; it will arrive as a complete assembly with theshell marked 8701337.

b. Regulator Box Assembly (Internal). I fwater leakage or corrosion is detected, it is pos-sible that extensive damage has been done andthe regulator cannot be easily repaired. Com-ponents should be performance tested and re-tained if acceptable. Check for disconnected orburnt wires, missing components and replace/repair as necessary. Carefully remove the transis-tor mounting plate, noting the position of thescrews, washers and rubber insulators. Visuallyinspect the circuit board for burnt components.Replace the circuit board through cannibalizationif burnt components are found. Carefully reinstallthe transistor mounting plate.

c. Regulator Verification Check. After per-forming the above inspection, if the regulatorappears to be in good condition, check its per-formance on a test stand. If the regulator failsthis check, proceed to the following componenttests.

3-3. Bench Testing. Figures 3–1 and 3–2 show themethod for testing NPN transistors. These figuresapply to all models in this chapter.

3-1

TB 9-2920-225-34-1

Figure 3-1. NPN transistor (Leece-Neville).

3-2

Figure 3–2. Transistor resistance checks (Leece-Neville).

TB 9-2920-225-34-1

Section II. LEECE-NEVILLE MODEL R0015027RA

3-4. General. Figure 3–3 is a plan view of theregulator with the cover removed, showing theremaining test points. There are 10 total testpoints. Figure 3–5 is an electrical schematicdiagram of the regulator circuit.

3-5. Checkout and Repair.a. Diode D2 and Relay (see fig. 3–3 and 3–5)

(voltage off).(1) Place positive probe of ohmmeter to pin

F of connector J2 and negative probe on TP1.Meter should read 0 ohms.

(2) Place positive probe on TP1 and nega-tive probe on TP2. Meter should read low ohms(hundreds).

(3) Reverse probes in (2) above. Metershould read high ohms (thousands).

(4) If other readings are obtained in (2)or (3) above, replace diode D1.

(5) Place positive probe on TP2 and nega-tive probe on Pin C of connector J2. Meter shouldread approximately 55 ohms.

(6) If another reading is obtained, removeand replace both the relay and diode D2.

b. Resistor R1. Replace ohmmeter probe acrossresistor R1 (see figs. 3-3 and 3-5). Meter shouldread approximately 0.4 ohms.

c. Voltage Adjustment Rheostat (R15).(1) Remove voltage adjustment access screw

from the cover of regulator.(2) Place ohmmeter probes to terminals of

the rheostat (see figs. 3-4 and 3-5).(3) Rotate rheostat fully clockwise; read-

ing should be approximately 45 ohms.(4) Rotate rheostat fully counterclockwise;

reading should be less than 5 ohms.(5) If other readings are obtained, replace

the rheostat, NSN 5905-00–581-1405.d. Power Resistor R2. Place ohmmeter probes

across power resistor R2 (see figs. 3-4 and 3–5).Meter should read approximately 30 ohms.

e. Detailed Circuit Checks.(1) Table 3–1 contains “power off” resist-

ance checks of the circuit (see figs. 3-3 and 3–4for test points ).

(2) Table 3-2 contains “power on” voltagechecks of the circuit (see figs. 3–3 and 3-4 fortest points).

f. Functional Check. Check the performanceof the regulator on the test stand and make finalvoltage adjustments. Voltage output should read28 volts. If the regulator does not function prop-erly, perform the following:

(1) Check wires and connections.

Figure 3–3. Top-view (Leece-Neville)–model R0015027RA.

3-3

TB 9-2920-225-34-1

(2) Replace cover assembly.(3) Perform bench test procedures.

NOTE

After final repair, check regulator on thetest stand.

If the regulator still does not function correctly

it will be necessary, if local skills permit, to testeach component. All the parts should be checkedwith an ohmmeter to make sure that there are nocracked traces. Traces with hairline cracks willshow good at lower temperatures and will tendto show open circuit at higher temperatures. If theboard seems good at room temperature, but theregulator still fails, this could be the cause.

Figure 3-4. Circuit board-model R0015027RA.

3-4

Figure 3-5.

TB

9-2920-225-34-1

3-5

TB 9-2920-225-34-1

Table S-1. Resistance Checks (Power Off)–Mode1 5027RA

Table 3-2. Voltage Checks (Power On)—Model 5027RA

3-6

TB 9-2920-225-34-1

Table 3–2. Voltage Checks (Power On—Model 5027RA-continued

Section III. LEECE-NEVILLE MODEL R0015027RB

3-6. General. Figure 3–6 is an exploded view ofthe regulator, listing the major subassemblies.Figure 3–7 is a plan view of the box and an under-side view of the cover, showing the interconnectwiring.

3-7. Checkout and Repair.

a. Diode and Relay (power disconnected).(1) Place positive probe of ohmmeter to pin

F of connector J2 (see fig. 3-7).(2) Place negative probe to top connection of

diode CR2, (see fig. 3–7). Meter should read Oohms.

(3) Place negative probe to TP1. Metershould indicate low resistance.

(4) Reverse probes. Meter should indicatehigh resistance.

(5) If other readings are obtained, replacediode CR2.

(6) Move negative probe to pin C of connec-tor J1. Meter should read approximately 55 ohms.

(7) If another reading is obtained, replacerelay (see fig. 3–7).

b. Power Resistor. Place ohmmeter probesacross power resistor R1 (see fig.should read approximately 40 ohms.

c. Voltage Adjustment Rheostat.(1) Remove voltage adjustment

from the cover of regulator.

3–7). Meter

access screw

(2) Place ohmmeter probes to terminals ofthe rheostat (see fig. 3-7).

(3) Rotate rheostat fully clockwise, readingshoud be approximately 45 ohms.

(4) Rotate rheostate fully counterclockwise,reading should be less than 5 ohms.

(5) If other readings are obtained, replacethe rheostat.

d. Transistor and Circuit Board. If no faultycomponents were detected after performing testsa, b, and c, replace the cover assembly (see fig.3-7) .

NOTE

After final repair, check regulator on thetest stand.

If the regulator still does not function correctlyit will be necessary, if local skills permit, to testeach component. All the parts should be checkedwith an ohmmeter and the capacitors checked witha capacitance meter. The circuit board tracesshould be checked with an ohmmeter to make surethere are no cracked traces. Traces with hairlinecracks will show good at lower temperatures andwill tend to show open circuit at higher tempera-tures. If the board seems good at room tempera-ture, but the regulator still fails, this could be thecause.

3-7

TB 9-2920-225-34-1

Figure 3-6. Leece-Neville model 5027RB exploded view.3-8

TB 9-2920-225-34-1

Figure 3-7. 0pen view–model 5027RB.

Section IV. LEECE-NEVILLE MODEL R0015027RC

3-8. General. Figure 3–8 is an exploded view ofthe regulator, listing the major subassemblies.Figure 3–9 is a plan view of the box subassemblyand an underside view of the cover subassembly,showing the interconnect wiring. Figure 3–10 is aplan view of the box and an underside view of thecover showing the components and test points.There are 10 test points. Figure 3–11 is an electri-cal schematic diagram of the regulator circuit.

3-9. Checkout and Repair.

a. Diode D2 and Relay (see jigs. 3–8 through3–11) (voltage off).

(1) Place positive probe of ohmmeter to pinF of connector J2 and negative probe on TP1.Meter should read 0 ohms.

(2) Place positive probe on TP1 and negative

probe on TP2. Meter should read low ohms (hun-dreds ).

(3) Reverse probes in (2) above. Metershould read high ohms (thousands).

(4) If other readings are obtained in (2) or(3), replace diode D1.

(5) Place positive probe on TP2 and negativeprobe on pin C of connector J2. Meter should readapproximately 55 ohms.

(6) If another reading is obtained, removeand replace both the relay and diode D2.

b. Resistor R1. Place ohmmeter probes acrossresistor R1 (see figs. 3-9, 3-10, and 3–11 ), Metershould read approximately 0.4 ohms.

c. Voltage Adjustment Rheostat.(1) Remove voltage adjustment access screw

from cover of regulator.

3-9

TB 9-2920-225-34-1

Figure 3–8. Leece-Neville model 5027RC exploded view.

3-10

TB 9-2920-225-34-1

Figure 3-9. Open view-mode 5027 RC.

(2) Place ohmmeter probes to the terminalsof the rheostat (see figs. 3-9,3-10, and 3-11).

(3) Rotate rheostat fully clockwise; readingshould be approximately 45 ohms.

(4) Rotate rheostat fully counterclockwise,reading should be less than 5 ohms.

(5) If other readings are obtained, replacethe rheostat.

d. Power Resistor R2. Place ohmmeter probesacross power resistor R2 (see figs. 3-9, 3–10, and3-11). Meter should read approximately 30 ohms.

e. Detailed Circuit Checks.(1) Table 3-4 contains “power off” resistance

checks of the circuit (see figs. 3–9, 3–10, and 3–11for test points).

(2) Table 3-4 contains “power on” voltagechecks of the circuit (see figs. 3-9, 3-10, and 3-11for test points ).

NOTEPower transistors on the circuit boardand heat sink can be checked as outlinedon figures 3–1 and 3–2. However, sincethey are soldered into the circuit, re-moval and replacement is more time con-suming.

f. Functional Check. Check the performance ofthe regulator on the test stand and make finalvoltage adjustments. Voltage output should read28 volts. If the regulator does not function prop-erly, perform the following:

(1)(2)(3)

Check wires and connections.Replace circuit board or cover assembly.Perform bench test procedures.

NOTE

After final repair, check regulator on thetest stand.

If the regulator still does not function correctlyit will be necessary, if local skills permit, to testeach component. All the parts should be checkedwith an ohmmeter and the capacitors checked witha capacitance meter. The circuit board tracesshould rechecked with an ohmmeter to make surethat there are no cracked traces. Traces with hair-line cracks will show good at lower temperaturesand will tend to show open circuit at higher tem-peratures. If the board seems good at room tem-perature, but the regulator still fails, this couldbe the cause.

3-11

TB 9-2920-225-34-1

Figure 3-10. Circuit board model 5027RC.

3-12

Figure 3-11.

TB

9-2920-225-34-1

3-1

3

TB 9-2920-225-34-1

Table 3-3. Resistance Checks (Power Off) - Model 5027RC

Table 3-4. Voltage Checks (Power On)—Mode1 5027RC

3-14

TB 9-2920-225-34-1

Section V. LEECE-NEVILLE MODEL R0015027RD

3-10. General. Figure 3–12 is a plan view of theregulator with the cover removed, showing theheat sink and the circuit board. The componentsare indicated by their reference designations, andon the circuit board the terminals are associatedwire colors are also indicated. Figure 3–13 is aplan view of the regulator with the cover, heatsink and circuit board removed, showing the relayand remaining components. The components areindicated by their reference designations, and testpoints 1 through 5 are shown. Figure 3-14 is aplan view of the regulator with the cover removed,showing test points 6 through 18. There are 18total test points. Figure 3-15 is an electrical sche-matic diagram of the regulator circuit.

3-11. Checkout and Repair.

a. Relay (see Figs. 3–13 and 3–14) (power dis-connected).

(1) Place positive probe of ohmmeter on pinF of connector J2 and negative probe on TP1(white/yellow wire). Meter should read low ohms(hundreds).

(2) Reverse probes. Meter should read highohms (thousands).

(3) If other readings are obtained, see de-tailed circuit check below.

(4) Place ohmmeter positive probe on TP2and negative probe on TP1. Meter should readapproximately 50 ohms.

(5) Reverse probes. Meter should read lowohms (more than 10 and less than 100).

(6) If other readings are obtained, discon-nect the WHT/YLW wire on TP1 and repeat (4)and (5) looking for a meter reading of 40 to 60ohms in each case. If other readings are obtainedreplace the relay, NSN 5945–00-409-3883. Re-place the WHT/YLW wire on TP1.

(7) Place ohmmeter probes on TP3 and TP4.Meter should read infinity (open circuit). If otherreadings are obtained replace the relay, NSN5945-00-409-3883.

(8) Place positive ohmmeter probe on TP17and negative probe on TP8. The reading shouldbe greater than 10 ohms and less than 100 ohms;if not replace Ql, NSN 5961–00–730–3284.

(9) Place positive ohmmeter probe on TP12and negative probe on TP13. Rotate the potenti-ometer. Full counterclockwise should be 0 ohms,gradually increasing to 100 ohms at full clockwide.If not, replace the potentiometer. The potenti-ometer is a 100 ohm, 2 watt, tab-mounted device.

Failed devices have been successfully replacedwith part number 71590–WT-100 by performingsome minor mechanical modification.

Globe-Union Inc. FSCM 71590Centralab Electronics Div.Hwy. 20 W. P.O. Box 858Fort Dodge, IA 50501(10) Place positive ohmmeter probe on TP15

and negative probe on TP16. The reading shouldbe greater than 10 ohms and less than 100 ohms;if not, replace D3.

b. Resistor R10.(1) Place ohmmeter probes on pins D and E

of connector J2. Meter should read approximately0.4 ohms.

(2) If other readings are obtained, replaceresistor.

c. Resistor R9.(1) Place ohmmeter probes on TP5 and pin

C of connector J2. Meter should read 0 ohms plus(resistor is actually rated at 0.05 ohms).

(2) If other readings are obtained, check thewiring from the bottom terminal of the resistorto pin C on connector J2. If the wire continuity isgood, replace the resistor.

d. Detailed Circuit Checks. Table 3–5 contains“power off” resistance checks of the circuit (seefigs. 3–12, 3-14 and 3-15 for test points).

e. Functional Check. Check the performance ofthe regulator on the test stand and make final volt-age adjustments. Voltage output should read 28volts. Ifperform

(1)(2)(3)

the regulator does not function properly,the following:Check wires and connections.Replace cover assembly.Perform bench test procedures.

NOTE

After final repair, check regulator on thetest stand.

If the regulator still noes not function correctlyit will be necessary, if local skills permit, to testeach component. All the parts should be checkedwith an ohmmeter and the capacitors checked witha capacitance meter. The circuit board tracesshould be checked with an ohmmeter to ensurethat there are no cracked traces. Traces withhairline cracks will show as good at lower tem-peratures and will tend to show open circuit athigher temperatures. If the board seems good atroom temperature, but the regulator still fails,this could be the cause.

3-15

TB 9-2920-225-34-1

Figure 3-12. Leece-Neville-model 5027RD.

3-16

TB 9-2920-225-34-1

Table 3-5. Resistance Checks (Power Off) - Model 5027RD

Table 3-6. Substitutes for Diode Z1-Model 5027RD

3-17

TB 9-2920-225-34-1

Figure 3-13. Circuit board removed-model 5027RD.

3-18

TB 9-2920-225-34-1

Figure 3-14. Test points-model 5027RD.

3-19

Figure 3-15.

TB

9-2920-225-34-1

3-20

TB 9-2920-225-34-1

CHAPTER 4

L E L A N D A I R B O R N E M O D E L

4-1. Introduction. One model was produced byLeland Airborn Products Division of AmericanMachine and Foundry Co. The manufacturer’sname is now:

CODE IDENT 07639 (FSCM)Leland Electrosystems Inc.740 E. National RoadP.O. BOX 128Vandalia, OH 45377

TELEPHONE AC 513898-5881

The manufacturer is also now known as AMFElectrosystems Division at the same address. Themanufacturer’s part number for this model is CSV2183-1.

4-2. General Inspection.

a. Regulator Box Assembly (external). Checkfor missing or stripped cover, connector andmount retainer screws and voltage adjustment ac-cess plug. Check connectors for signs of arcing,bent or pushed in pins, broken connectors andthread damage. Correct deficiencies by utilizationof serviceable components from unrepairables orrequisitioning components from the manufacturer.The pin receptacle (J2) is part number 19207–7064429 or MS3102A28–22P per MIL-C-5015.The socket receptacle (Jl) is part number 19207-7064706, for which there is no equivalent NSNnumber.

As assembly is available from Bendix.

CODE IDENT 77820 (FSCM)Bendix Corp. The

Components Div.Sherman AvenueSidney, NY 13838

Electrical

It should be ordered as part number 60–42228–10S, it is possible that extensive damage has beendone and the regulator cannot be easily repaired.Components should be performance tested and re-tained if acceptable. Check for disconnected orburnt wires, missing components and replace/re-pair as necessary. Carefully remove the transistormounting plate noting the position of the screws,

washers and rubber insulators. Visually inspectthe circuit board for burnt components. Replacethe circuit board through cannibalization if burntcomponents are found. Carefully reinstall thetransistor mounting plate.

c. Regulator Verification Check. After perform-ing the regulator appears to be in good condition,check its performance on a test stand.

If the regulator fails this check, proceed to para-graph 4–3.

4-3. Bench Testing.

a. General. Figures 4-1 and 4-2 show themethod for testing NPN transistors. Figure 4-3shows a plan view of the circuit board assembly,the regulator with the cover and circuit board re-moved, and an electrical schematic diagram of theregulator.

b. Diode and Relay.(1) Remove six screws and place the circuit

board to one side.(2) Place positive probe of ohmmeter to pin

F of connector J2, (see fig. 4-3).(3) Place negative probe to TP1. Meter

should indicate low resistance.(4) Reverse probes. Meter should indicate

high resistance.(5) If other readings are obtained, replace

diode CR6, (see fig. 4-3).(6) Move negative probe to TP2. Meter

should read approximately 250 ohms.(7) If another reading is obtained, replace

the relay, (see fig. 4–3).

c. Field Discharge Diode.(1) Place positive probe of ohmmeter to pin

E of connector J1 (see fig. 4-3).(2) Place negative probe to pin B of J1.

Meter should indicate low resistance.(3) Reverse the probes. Meter should indi-

cate high resistance.(4) If other readings are obtained, replace

diode CR7.

4-1

TB 9-2920-225-34-1

Figure 4-1. NPN transistor (Leland Airborne model).

Figure 4-2. Transistor resistance checks (Leland Airborne model).

4-2

TB 9-2920-225-34-1

Figure 4-3. Schematic diagram, circuit board, and bracket assy (Leland Airborne model).

4-3

TB 9-2920-225-34-1

d. Transistors.

NOTE

Transistors Q4 and Q5 can be checkedfairly accurately without removing themfrom the circuit.

(1) Check transistors Q4 and Q5, (see fig.4-3), inaccordance with figures 4-l and 4-2.

NOTE

Due to the connectioncuit, omit the emitterin figure 4-2.

(2) If other readingstransistors Q4 and Q5.

of Q4 in the cir-to collector check

are obtained, replace

e. Circuit Board. If no faulty components weredetected after performing tests a, b, and c, replacethe circuit board.

f. Functional Check. Check the performance ofthe regulator on the test stand and make finalvoltage adjustments. Voltage output should read28 volts. If the regulator does not function prop-erly, perform the following:

(1) Check wires and connections.(2) Replace circuit board.(3) Perform bench test procedures.

NOTE

After final repair, check regulator on thetest stand.

If the regulator still does not function correctly itwill be necessary, if local skills permit, to testeach component. All the parts should be checkedwith an ohmmeter and the capacitors checked witha capacitance meter. The circuit board tracesshould be checked with an ohmmeter to ensurethat there are no cracked traces. Traces with hair-line cracks will show good at lower temperaturesand will tend to show open circuit at higher tem-peratures. If the board seems good at room tem-perature, but the regulator still fails, this couldbe the cause.

Table 4-1. Replacement Parts List-Leland Airborne Model

4-4

TB 9-2920-225-34-1

CHAPTER 5

100 AMP REGULATOR CHECKER

5-1. Purpose. This checker is intended to providequick bench tests to determine the general condi-tion f the regulator. The checker is not intendedto replace the authorized test stands which arenecessary to determine the accurate operatingcondition of the regulator.

5-2. Construction. The regulator checker can belocally fabricated using salvaged components. Themini-ammeter is an optional feature and most anymeter can be used, provided it is shunted to givemidscale reading.

5-3. Power Supply. The regulator checker is usedin conjunction with a variableexternal power sup-ply having the following characteristics:

a. Voltage range 0-32 volts DC minimum.

b. Current range must be at least 2 AMPS.

c. The output power must be well filtered.

NOTEThe 500 AMP test stands, external powersupply is adequate if additional filteringis added.

5-4. Operation.

a. Connect the checker to the regulator to betested.

b. Connect power supply to the checker.

CAUTIONBe sure proper polarity is maintained.

c. Advance the power supply voltage controland note the voltage when the regulator relay isclosed and the main circuit light comes on. Thisis the relay closing voltage.

d. Advance the voltage to 20 volts. The fieldindicator light should come on if the regulatorswitching transistors are functioning.

e. Advance the voltage until the field light turnsoff (maximum of 32 volts). The light should shutoff if the regulating and switching transistors arefunctioning correctly.

f. Adjust the power supply voltage toadjust the regulator voltage adjustinguntil the field indicator light turns off.

g. If the regulator fails these checks,bench tests and repairs.

28 volts,rheostat

perform

h. If the regulator passes these checks, performfinal tests on the authorized test stand.

5-5. Mini-Ammeter Operation. If the regulatorchecker is equipped with the optional meter, thefollowing additional data can be obtained.

a. Note the average regulator current drawfrom several regulators which are known to be ingood operating condition.

b. While performing the above, check if themeter reading is higher than normal, check forshorted components and circuit. If the reading islower than normal, check for open circuits andcomponents.

5-1

TB 9-2920-225-34-1

Figure 5–1. 100 AMP solid state regulator checker.

5-2

TB 9-2920-225-34-1

APPENDIX A

CONSOLIDATED NATIONAL STOCK NUMBERS (NSN)AND FEDERAL SUPPLY CODES FOR MANUFACTURERS (FSCM)

National numbers listed in this appendix are in National Item Identification NumberSequence (NIIN).

NSN

5961-00-018-83835961-00-054-41415961-00-054-91385961-00-068-20015961-00-069-67675961-00-078-06285961-00-103-15195961-00-105-57345961-00-133-03965961-00-215-59995961-00-223-22305961–00–226-51345961-00-247-30465961-00-255-99865961-00-262-07295945-00-270-12095961-00-327-82805961-00-359-57525961-00-400-19925061-00-403-25665945-00-409-38835961-00-431-78635961-00-438-21565961-00-450-09225961-00-462-30775961-00-481-42055961-00-483-43965961-00-484-50355961-00-484-50365961-00-523-91715961-00-577-07715905-00-581-14055961-00-620-97705961-00-624-4929

P / N

1N746A2N34411N1342A1N756A1N1614R1N938AMR1122JANTX 1N756A26316033-202N5039MR1122RJAN 1N937B1N46972N62582N5039711362N3773JANTX 2N50381N959AJAN 2N3772EK212JAN 2N37712N37721N47218106497-12N56712N5142JANTX 1N937BJANTX 1N938B2N5679MR502669-01501N9381N4820

FSCM

15818813490527701281082250471304713813499916702735047138134901281027358134935510545908134901281813493121181349027350471331550012812701481349813499499004713020320471301295

NSN

5961-00-730-32842920-00-735-95425916-00-758-58165961-00-760-13025961-00-761–46315961-00-811-37525961-00-833-90505961-00-845-64585961-00-847-52465961-00-852-51745961-00-854-67595961-00-858-89605961-00-864-75278040-00-877-98725961-00-879-71455961-00-880-47836850-00-880-76165961-00-892-08895961-00-892-31955961–00–899–98995961-00-912-90085961-00-914-60055961-99-926-02085961-00-929-49755961–00-929-50145961-00-931-82315961-00-935-64795961-00-938-76495961-00-951-87575961-01-003-05845961-01-017–09905961-01-019-64005961-01-033-08225961-01-038-0809

P / N FSCM

2N2405 0128111602713 19207JANTX 2N3371 81349JANTX 2N3772 813491N5402 052771N936 850051N2482 120451N756A 813491N746A 25228JAN 1N939B 813492N3772 21929JAN 2N5038 813492N3772 54590MIL-A-64106 913491N936B 129541N4002 04713MIL-S-8660 81349JAN 1N938B 813491N936A 047132N3447 047132N3638A 120401N4004 047131N1616R 813491N4721 140282N3773 047132N3415 082572N5038 137151N4141 062882N2222A 813492N6579 04713JANTX 2N5672 81349JAN 2N5671 81349JANTX 2N5039 813491N3022B 04713

*U.S. GOVERNMENT PRINTING OFFICE: 1981—355-902

A-1

TB 9-2920-225-34-1

By Order of the Secretary of the Army:

Official:

E. C. MEYERGeneral, United States Army

Chief of Staff

ROBERT M. JOYCEBrigadier General, United States Army

The Adjutant General

Distribution:

To be distributed in accordance with DA Form 12-38, TB requirementsfor 1/4 Ton Truck Utility, M151A2.

THE METRIC SYSTEM AND EQUIVALENTS

PIN: 049797-000

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