Section III. TROUBLESHOOTING

TM 11-6130-392-34

Table 4-2. Tools and Materials

National

Use

Stock No.

Item

5180-00-610-8177

.............................................

Tool kit, Electronic Equipment TK-105/G . . . . . . . . . . .

4940-00-785-1162

Heat shrink sleeving installed over some connections . .

Heat Gun . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cover exposed terminals and allow to cure. (Curing

Staking compound, blue SM-B-739574 . . . . . . . . . . . . . .

time 24 hours)

Staking compound, red SM-A-852514. . . . . . . . . . . . . . .

Cover exposed terminals and allow to cure. (Curing

time 24 hours)

6130-01-066-4496

Special, fault isolation of charging modules (A6 through

Extender board, testing (23 pin) SM-D-889125. . . . . . . .

A10) and power supply assembly (A11)

6130-01-066-4495

Extender board, testing (41 pin) SM-D-889122. . . . . . . .

Special, fault isolation of timing circuit assembly

(A12)

Section III. TROUBLESHOOTING

4-9. Use of Equipment and Special

4-7.

Troubleshooting-General

Tools

This section contains instructions for trouble-

a. Refer to direct support maintenance, Chapter

shooting the Battery Charger PP-7286/U. General

3, section III, paragraph 3-9.

support personnel will replace and repair compo-

b. In use of digital multimeter, and reference to

nents, a s specifically listed in paragraph 4-3.

settings in text, F = Function, R = Range. For con-

Replacement and repair procedures are included in

tinuity checks, set Function to Ω (ohms) and Range

Section IV. Test procedures for GS use, after replac-

to 200 Ω (ohms). Reading should be less than 0.2

ing or repairing a component, are included in Sec-

ohms.

tion V. Figure FO-1 is a schematic diagram of the

battery charger.

4 - 1 0 . Bat t e r y C h a r g e r , P r e p a r a t i o n

for Testing

4-8. Troubleshooting Test Sequence

Refer to direct support maintenance, Chapter 3, sec-

tion III, paragraph 3-10.

a. Visual inspection. Before performing tests,

visually inspect the battery charger to find faults

4-11. Troubleshooting Test Procedure

that experienced and trained GS personnel usually

a. Perform test procedures as shown in table 4-3,

find.

in the sequence listed in column 1 to troubleshoot

b. Test sequence. The test sequence for trouble-

Battery Charger PP-7286/U.

shooting the battery charger and isolating faulty

b. From a malfunction indication in column 2,

components, is:

follow instruction or reference in column 3 to isolate

( 1 ) Perform the troubleshooting test proce-

faults and make required corrections.

dures listed in table 4-3.

NOTE

(2) Perform fault isolation test procedures con-

When a column 3 instruction in table 4-3 re-

tained in paragraph 4-12, when required by a table

quires finding and correcting an open cir-

4-3 instruction.

cuit; resoldering or replacing a wire lead is

(3) Test the battery charger, after replacing or

a general repair authorized and to be per-

repairing a faulty component, by using test proce-

formed by GS personnel.

dure listed in Section V.

c. Test point locations.

CAUTION

If meter needle pegs during any step of

(1) Refer to direct support maintenance

following table, quickly set POWER switch

Chapter 3, section III.

to OFF and perform instruction in column 3

(2) Additional illustrations are provided and

of step (4).

referenced in text.

4-4