Figure 4-1. Electronic Marker Generator AN/USM-108A, rear view.

TM 11-6625-542-14-1

Table 4-4. Organizational Troubleshooting

Malfunction

Probable cause

Corrective action

POWER indicator lamp does not light.

a. Defective ac line cora.

a. Check ac line cord. Replace cord if

necessary.

b. Defective indicator lamp.

b. Check POWER indicator lamp.

Replace if necessary.

c. Defective ac line fuse.

c. Check line fuse (fig. 4-1).

NOTE

Defective line fuse usually indicates

some other trouble. If new fuse blows,

higher category of maintenance is

required.

OVEN indicator lamp does not light.

a. Defective indicator lamp

a Check OVEN indicator lamp.

Replace if necessary.

b. Defective crystal oven fuse.

b. Check oven fuse (fig. 4-1).

NOTE

Defective oven fuse usually indicates

some other trouble. If new fuse blows,

higher category of maintenance is

required.

Figure 4-1. Electronic Marker Generator AN/USM-108A, rear view.

4-4