Table 5-1. Direct Support Troubleshooting Chart-Continued

TM 11-5895-1179-13 EE132-EA-OMP-010/E106 KY883 TO 31S1-2GSC-161

Item

Checks and

No.

Symptom

Probable Cause

Corrective Action

panel assembly. Reseat

power supply plug-in-

circuit card assembly A4.

Close and secure the

front panel assembly.

Set ON/OFF switch to ON.

g. Defective power supply

g. Replace power supply

plug-in-circuit card

assembly A4.

assembly A4 (paragraph

4-7).

POWER

a. Defective power supply

a. Replace power supply

SUPPLY

plug-in-circuit card

fault indi-

assembly A4.

assembly A4

cator il-

(paragraph 4-7).

luminates.

b. Defective capacitor

b. Replace capacitor A7C1

A7C1.

(paragraph 5-13).

c. Defective power induc-

c. Replace power inductor

tor A7L1.

A7L1 (paragraph 5-21).

d. Defective transformer

d. Replace transformer A7T1

A7T1.

(paragraph 5-11).

e. Defective diodes A7CR1

e. Replace defective diodes

and A7CR2.

A7CR1 and A7CR2

(paragraph 5-27).

f. Defective display and

f. Replace display and

control circuit card

assembly A6A1.

assembly A6A1 (paragraph

5-15).

g. Defective backplane

g. Replace backplane circuit

circuit card assembly

card assembly A5A1

A5A1.

(paragraph 5-14).

One or more

a. Improperly seated or

a. Perform off-line self-

ON LINE

defective plug-in-

test (paragraph 2-6).

FAULT INDI-

circuit card assembly.

Reseat or replace indi-

CATORS il-

cated defective plug-in-

luminate.

circuit card assembly as

necessary (paragraph

4-7).

On-line

a. Undetected fault on

a. Reseat all plug-in-

self-test

one of other circuit

circuit card assemblies.

fails after

card assemblies.

If fault remains,

indicated

replace plug-in-circuit

faulty plug-

card assemblies Al, A2,

in-circuit

and A3 one at a time

card assem-

(paragraph 4-7).

bly has been

replaced.

5-5