TM 1-1520-238-T-6
9–229
9–53.
28 VDC IS NOT PRESENT – FROM DC ELEC UTIL PWR CIRCUIT BREAKER (CB7)
9–53
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
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Access provisions –
R295 door opened
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 the ground service utility receptacle circuit
breaker panel, check that DC ELEC UTIL PWR
circuit breaker (CB7) is closed.
Does DC ELEC UTIL PWR circuit breaker
(CB7) stay closed?
YES
Go to step 3.
NO
Go to step 2.
2. Detach wire end at CB7-2. Check for short
between ground and wire end.
Does short exist?
YES
Repair shorted wire between
CB7-2 and J16-A.
Go to paragraph 9–47.
NO
Replace DC ELEC UTIL PWR
circuit breaker (CB7)
(TM 1-1520-238-23).
3. Check for open between:
CB7-2 and J16-A,
CB7-1 and (A402)TB1-3-F.
Does open exist?
YES
Repair open wire.
Go to paragraph 9–47.
NO
Go to paragraph 9–23 to
troubleshoot dc electrical power
generation.
END OF TASK
