Table 3-4 Troubleshooting

TM 11-6625-2609-12

Table 3-4 Troubleshooting

Corrective

action

Probable cause

Malfunction

a. VHF COMM OFF-PWR switch is a. Set VHF COMM OFF-PWR switch

AN/ARC-134 meter does not

to PWR.

OFF.

i n d i c a t e 27.5 vdc (-20%,

b. AN/ARC-134 meter switch not set b. Set meter switch to LINE V.

+10%).

to LINE V.

Defective panel lamps . . . . . . . . . . . . . Replace lamps (para 3-7).

Radio control or intercom con-

trol panel lamps do not light.

Replace lamps (para 3-8).

VHF COMM frequency counter

Defective frequency counter dial lamps

dials do not light.

c. Install a new lamp and rotate the lamp-

3-8. Replacement of Frequency Counter

holder clockwise until it is secure.

Dial Indicator Lamps

a. Rotate the quick-release fasteners (fig. 3-

3-7. Replacement of Radio Control and

2) one-quarter turn counterclockwise.

Intercom Control Panel Lamps

b. Slide the radio control forward and out of

a. Rotate lamp receptacle cap (fig. 3-1 ) coun-

the test panel.

terclockwise and remove it from the front panel.

b. Insert a new lamp into the lamp receptacle

c. Remove the cover attaching screws (fig. 3-

cap and rotate the cap clockwise until it is secure.

2) and lift the cover from the radio control.

Test panel, indicator lamp locations.