TM 1-1520-238-T-6
9591
9298. COMM VHF FM CIRCUIT BREAKER (CB64) DOES NOT STAY CLOSED
9298
OR 28 VDC IS NOT PRESENT AT (A76)J1-w
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairers
Multimeter, Digital
AN/PSM-45
Personnel Required:
68X
Armament/Electrical Systems Repairer
One person to assist
References:
TM 1-1520-238-23
TM 11-1520-238-23-2
WARNING
Turn off power before detaching or
attaching wires and connectors. High
current 28 VDC or 115 VAC is present.
Failure to do so could result in death or
serious injury.
1. On pilot ELEC PWR panel, set BATT/EXT PWR
switch to EXT PWR.
Does COMM VHF FM circuit breaker (CB64)
stay closed?
YES
Go to step 4.
NO
Go to step 2.
2. On pilot center circuit breaker panel, open
COMM VHF FM circuit breaker (CB64). Set
BATT/EXT PWR switch to OFF. Check for short
between (A76)J1-w and ground.
Does short exist?
YES
Go to step 3.
NO
Refer to TM 11-1520-238-23-2
to troubleshoot VHF AM-FM
radio set.
3. Detach wire at CB64-2. Check for short between
(A76)J1-w and ground.
Does short exist?
YES
Repair shorted wire.
Go to paragraph 9263.
NO
Replace COMM VHF FM circuit
breaker (CB64)
(TM 1-1520-238-23).
4. Set BATT/EXT PWR switch to OFF. Check for
open between CB64-2 and (A76)J1-w.
Does open exist?
YES
Repair open wire.
Go to paragraph 9263.
NO
Replace COMM VHF FM circuit
breaker (CB64)
(TM 1-1520-238-23).
END OF TASK