Fault Isolation Tests

TM 11-6130-392-34

Go to section V.

to section V.

b. Check for continuity between S4A-C1 (fig.

h. Depress VOLTAGE TEST switch; measure

4-2) and TB1-E4 with multimeter.

resistance between TB1-E15 and TB1-E16.

(1) If resistance is less than 5,000 ohms; check

(1) If no fault is found; go to step c.

for faulty wiring between TB1-E6 and TB1-E16,

(2) If a fault is found; repair broken connection

or replace faulty lead (if any plug-in connector must

repair fault. Go to section V.

be replaced; send to depot). Go to section V.

(2) If resistance measured is 5,000 ohms or

c. Check for continuity between TB1-E3 and

more; replace TB1-R12 (Section IV, para 4-31). Go

TB1-E1 (fig. 3-3).

to section V.

Test 11. Low Voltage Power Supply Test.

(1) If no fault is found; replace CHANNEL

a. Get small flat-blade screwdriver, or equiv-

SELECT switch S4 (Section IV, para 4-29). Go to

section V.

alent; adjust A11-R3 (fig. 3-4) until all channels

read between 45 mA and 50 mA.

(2) If a fault is found; repair broken connection

or replace faulty lead (if any plug-in connector must

(1) If this adjustment can be made; go to step

be replaced; send to depot). Go to section V.

Test 13. Current Set (S7-S11) Switch Test.

(2) If adjustment, within 45-50 mA, cannot be

a. Set POWER switch to OFF and check for con-

made; set POWER to OFF, replace A11 power sup-

tinuity (fig. 4-2 and 3-3) at following points, using

ply assembly (Chapter 3, para 3-15 direct support

m a i n t e n a n c e ) . If same problem repeats; adjust

multimeter:

panel meter M1 (Section IV, para 4-36). Go to sec-

If Faulty Channel is:

Check Between:

tion V.

1 . . . . . . . . . . . . . . . . . . . . . . . . . S7-6 and TB1-E21

b. Set all FINE ADJ controls fully clockwise.

2 . . . . . . . . . . . . . . . . . . . . . . . . . S8-6 and TB1-E21

c . Turn CHANNEL SELECT switch (fig. 4-1)

3 . . . . . . . . . . . . . . . . . . . . . . . . . S9-6 and TB1-E21

t h r o u g h each of 5 positions; check panel meter

4 . . . . . . . . . . . . . . . . . . . . . . . . S10-6 and TB1-E21

reading.

5 . . . . . . . . . . . . . . . . . . . . . . . . S11-6 and TB1-E21

(1) If each channel reads 200 mA, or more; go

(1) If no fault is found; go to step b.

to section V.

(2) If a fault is found; repair broken connection

(2) If one or more channels reads less than 200

or replace faulty lead. Go to section V.

mA; set POWER switch to OFF. Replace A11 power

b. Check for continuity (fig. 4-2 and FO-1) at

supply assembly (Chapter 3, para 3-15). If same

following points, using multimeter:

problem repeats; adjust panel meter M1 (Section

If Faulty Channel is:

Check Between:

IV, para 4-36). Go to section V.

1 . . . . . . . . . . . . . . . . . . . . . . . . . . S7-5 and S4A-1

Test 12. Terminal Board (TB1) Test.

2 . . . . . . . . . . . . . . . . . . . . . . . . . . . S8-5 and S4A-2

a. Set multimeter (F = Ω, R = 200 K Ω). S e t

3 . . . . . . . . . . . . . . . . . . . . . . . . . . . S9-5 and S4A-3

POWER to OFF. Set all CURRENT SET switches to

4 . . . . . . . . . . . . . . . . . . . . . . . . . S10-5 and S4A-4

50 mA position. Measure resistance of TB1-R10 (fig.

5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . S11-5 and S4A-5

3-3).

(1) If no fault is found; replace CURRENT SET

(1) If resistance is between 18,500 and 18,900

switch (Section IV, para 4-26) for the matching

ohms; go to step b.

faulty channel(s). Go to section V.

(2) If resistance is not between 18,500 and

(2) If a fault is found; repair broken connection

18,900 ohms, replace R-10 (Section IV, para 4-31).

or replace faulty lead. Go to section V.

Section IV. Maintenance of Battery Charger

4-13. Component Replacement and Repair

WARNING

Set POWER switch to OFF and disconnect

Chassis and panel mounted components listed in

power cable from power source before per-

p a r a g r a p h 4-3b. are authorized replacements at

forming maintenance inside battery

general support level of maintenance. Open circuits

charger.

may be soldered and individual leads may be re-

placed, if necessary. Replacement of printed wiring/

4-14. Battery Holders (1 and 2)

board connectors or wiring harness, and repair of

printed wiring/board assemblies and A15 assembly

Removal and installation of either battery holder

components is specifically limited to depot level

(fig. 4-3) are as follows:

maintenance.

a. Removal.

4-15