Table 4-3. Organizational 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

POWER indicator is

a. Input/Output

a. Set ON/OFF switch to

illuminated but

plug-in-circuit

OFF. Release the four

other indicators

card assembly A3

front panel assembly

do not illumi-

not properly

fasteners and lower

nate during lamp

seated.

the front panel

test.

assembly. Reseat

Input/Output plug-in-

circuit card assembly

A3. Close and secure

the front panel

assembly. Set ON/OFF

switch to ON.

b. Defective input/

b. Replace input/output

output plug-in-

plug-in-circuit card

circuit card

assembly A3

assembly A3.

(paragraph 4-7).

Equipment is in on-

a. Power supply

a. Reseat power supply

line operation and

plug-in-circuit

plug-in-circuit card

POWER SUPPLY fault

card assembly A4

assembly A4 (see step

indicator illumi-

not properly

2a above).

nates.

seated.

b. Defective power

b. Replace power supply

supply plug-in-

plug-in-circuit card

circuit card

assembly A4

assembly A4.

(paragraph 4-7).

While equipment is

a. Defective plug-

a. Perform off-line self-

in on-line opera-

in circuit card

test (paragraph 2-6)

tion, one or more

assembly.

and replace indi-

FAULT INDICATORS

cated defective plug-

illuminate. (Other

in-circuit card assem-

than POWER SUPPLY

bly (paragraph 4-7).

fault indicator.)

b. Error rate

b. Check error rate

alarm threshold

alarm threshold for

set too low.

proper setting

(paragraph 2-7).

4-5