TM 1-1520-238-T-7
11–250
11–32.
ASE BUCS CIRCUIT BREAKER DOES NOT STAY CLOSED – FAULT IN CPG
11–32
BUCS WIRING
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68X
Armament/Electrical Systems Repairer
References:
TM 1-1520-238-23
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Non–transparent
barrier removed
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. Detach P413. Check for short between
P413–B5 and ground.
Does short exist?
YES
Go to step 2.
NO
Go to step 3.
2. Check for short between J266–1 and ground.
Does short exist?
YES
Repair shorted wire between
P413–B5 and J266–1.
Go to paragraph 11–23.
NO
Go to step 5.
3. Check for short between P413–B12 and ground.
Does short exist?
YES
Go to step 4.
NO
Go to step 6.
4. Check for short between J268–1 and ground.
Does short exist?
YES
Repair shorted wire between
P413–B12 and J268–1.
Go to paragraph 11–23.
NO
Replace CPG collective SPAD
(TM 1-1520-238-23).
5. Detach P686. Check for short between J266–5
and ground.
Does short exist?
YES
Repair shorted wire between:
J266–5 and P237 SP1,
P237 SP1 and J447–B13,
P447–B13 and P686–51.
Go to paragraph 11–23.
NO
Replace CPG lateral SPAD
(TM 1-1520-238-23).
6. Check for short between P413–B13 and ground.
Does short exist?
YES
Go to step 7.
NO
Go to step 9.
7. Detach P447 and P108. Check for short
between P413–B13 and ground.
Does short exist?
YES
Repair shorted wire between:
P413–B13 and P234 SP1,
J108–i and P234 SP1,
J447–B19 and P234 SP1.
Go to paragraph 11–23.
NO
Go to step 8.
8. Check for short between P686–54 and ground.
Does short exist?
YES
Repair shorted wire between
P686–54 and P447–B19.
Go to paragraph 11–23.
NO
Replace CPG BUCS select
trigger switch
(TM 1-1520-238-23).
