Fault Isolation Tests

TM 11-6130-392-34

Table 3-3. Troubleshooting Test Procedures Continued

Column 2

Column 3

Column 1

Malfunction Indication

Reference, or Instruction

Test Procedure

None

None . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

( 2 1 ) If troubleshooting tests are now

completed, turn POWER switch to

OFF. Remove power cable from 115

VAC source. Remove band from in-

terlock switch, S6 and remove clip

leads from REMOTE BATTERY

jacks. Assemble retainer and cover

and set controls per para 3-10e. Refer

to figure 3-1.

Reposition switch S6; then, if no light,

Lamp does not light . . . . . . . . . . . . . . . . . .

(22) Connect power cable to 115 VAC. Set

send to next higher maintenance level.

POWER switch to ON. POWER ON

lamp should light.

( 2 3 ) Set POWER to OFF. Disconnect

power cable. Return battery charger

to service.

"off," install A9, and go to step g.

3-12. Fault Isolation Tests

(2) If POWER switch trips "off," replace A8

Tests, for use by direct support (DS) maintenance

(Section IV, para 3-14), re-install A9 and A10. Go to

p e r s o n n e l , are included for specific components

section V.

authorized for testing and replacement at DS level.

g. Set POWER switch to ON.

T h e s e tests, with component references and de-

(1) If POWER switch stays "on," set POWER

scriptions, are as follows:

"off," install A10, and go to step h.

Test 1. Power Supply Assembly (A11) Short Cir-

(2) If POWER switch trips "off," replace A9

cuit Test.

(Section IV, para 3-14), re-install A10. Go to section

a. Remove printed wiring board assembly (A11,

h. Set POWER switch ON.

fig. 3-2) (no extender board to be used), and set

( 1 ) If POWER switch stays "on," return to

POWER switch to ON.

(1) If POWER switch trips "off"; install A11

table 3-3.

and go to step b.

(2) If POWER switch trips "off," replace A10

(2) If POWER switch r e m a i n s "on"; replace

(Section IV, para 3-14), and go to section V.

Test 2. POWER ON Lamp (DS1) Test.

A11 (Section IV, para 3-15). Go to section V.

a. Set POWER to OFF.

b. Remove A6, A7, A8, A9, and A10 charging

b. Remove lens cap, with lamp from charger.

modules (fig. 3-2).

c. Using Rx 100 scale of multimeter, measure re-

c. Set POWER switch to ON.

sistance of lamp.

(1) If POWER switch remains "on"; set

(1) If resistance is less than 500 ohms, go to

POWER "off"; install A6, and go to step d.

step d.

(2) If POWER switch trips "off"; discontinue

(2) If resistance is more than 500 ohms, replace

testing and forward battery charger to next higher

lamp. Go to section V.

maintenance level.

d. Set POWER to OFF and check that battery

d. Set POWER switch to ON.

charger interlock switch (S6) arm is firmly held in

(1) If POWER switch remains "on"; set

the down (closed) position.

POWER "off"; install A7, and go to step e.

(1) If interlock switch is firmly held down, dis-

(2) If POWER switch trips "off," replace A6

continue testing and forward charger to next higher

(Section IV, para 3-14), install A7, A8, A9, and A10.

maintenance level.

Go to section V.

(2) If interlock switch is not firmly held down,

e. Set POWER switch to ON.

firmly hold switch arm down with a rubber band.

(1) If POWER switch stays "on," set POWER

Return to table 3-3.

"off," install A8, and go to step f.

Test 3. Relay Control Test.

(2) If POWER switch trips "off," replace A7

a. Set POWER to OFF.

(Section IV, para 3-14), install A8, A9, and A10. Go

b. Connect oscilloscope probe to test point

to section V.

S3-TP1 (fig. 3-3) on terminal board (TB1). Connect

f. Set POWER switch to ON.

return lead to TB1-E21. Measure DC voltage.

(1) If POWER switch stays "on," set POWER

3-6