Table 5-1. Direct Support Troubleshooting Chart

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

Table 5-1. Direct Support Troubleshooting Chart-Continued

Item

Checks and

No.

Symptom

Probable Cause

Corrective Action

i. Defective plug-in-

i. Replace all plug-in-

circuit card assemblies

Al, A2, or A3.

(paragraph 4-7). Apply

ac power. If the fuse

does not blow, reinstall

the original plug-in-

circuit card assemblies

one at a time. Reapply

ac power. If the fuse

blows, repeat this step

as a process of

elimination until the

plug-in-circuit card

assembly that causes the

fuse to blow is found.

Refer to paragraph 4-5

for replacement of the

fuse.

When ON/OFF

a. Defective primary

a. Check continuity of cable

switch is

power cable assembly.

and replace if defective.

set to ON,

b. Defective power con-

b. Set ON/OFF switch to OFF.

fan does

nector assembly A5MP3

Remove site power from

not start

(figure 5-4).

encoder-decoder.

and POWER

Remove chassis cover

indicator

(paragraph 5-6), and

does not

plug-in-circuit card

illuminate.

assemblies (paragraph

4-7).

WARNING

High voltage of 115

Vac, dangerous to

life, exists in the

encoder-decoder when

the ON/OFF switch

is set to ON.

Apply site power to

encoder-decoder and

measure voltage at

terminals 12 and 13 on

A7TB1 (figure 5-2).

Voltage should be same

as power source (108 to

132 Vac). Replace power

connector assembly A5MP3

(paragraph 5-18) if

voltage is absent.

5-3