Table 4-3. Organizational Troubleshooting Chart

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

WARNING

Set ON/OFF switch to OFF before opening front panel assembly and removing plug-in-circuit card

assemblies.

Item

Checks and

No.

Symptom

Probable Cause

Corrective Action

When ON/OFF switch

a. Blown fuse Fl.

a. Check blown fuse indi-

is set to ON, fan

cator. If illuminated,

does not start and

replace fuse Fl

POWER indicator

(paragraph 4-5). If the

does not illumi-

fuse blows again

nate.

replace power supply

plug-in-circuit card

assembly A4 (paragraph

4-7). If the fuse

still blows refer to

higher level of mainte-

nance.

b. Primary power is

b. Check connector at

absent.

source input and cable

connection at A5J13 for

tightness.

When ON/OFF switch

a. Power supply

a. Set ON/OFF switch to

is set to ON,

plug-in-circuit

OFF. Release the four

POWER indicator

card assembly A4

front panel assembly

does not illumi-

not properly

fasteners and lower the

nate but fan

seated.

front panel assembly.

starts.

Reseat power supply

plug-in-circuit card

assembly A4. Close and

secure the front panel

assembly. Set ON/OFF

switch to ON.

b. Defective power

b. Replace power supply

supply plug-in-

plug-in-circuit card

circuit card

assembly A4

assembly.

(paragraph 4-7).

4-4