TM 1-1520-238-T-6
9–502
9–232. VIB MON CIRCUIT BREAKER (CB79) – DOES NOT STAY CLOSED OR 28 VDC
9–232
IS NOT PRESENT AT P1-10
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68X
Armament/Electrical Systems Repairer
One person to assist
References:
TM 1-1520-238-23
TM 1-1520-238-T-4
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 circuit breaker (CB79) stay closed?
YES
Go to step 4.
NO
Go to step 2.
2. Open CB79 and set BATT/EXT PWR switch to
OFF. Check for short between
P1-10 and ground.
Does short exist?
YES
Go to step 3.
NO
Refer to TM 1-1520-238-T-4 to
troubleshoot drive system.
3. Detach wire at CB79-2. Check for short between
P1-10 and ground.
Does short exist?
YES
Repair shorted between CB79-2
and P1-10.
Go to paragraph 9–220.
NO
Replace VIB MON circuit
breaker (CB79)
(TM 1-1520-238-23).
4. Set BATT switch to OFF. Check for open
between:
CB79-1 and CB73-1,
CB79-2 and P1-10.
Does open exist?
YES
Repair open wire.
Go to paragraph 9–220.
NO
Replace VIB MON circuit
breaker (CB79)
(TM 1-1520-238-23).
END OF TASK
