TM 1-1520-238-T-6
9–461
9–205. 115 VAC – IS NOT PRESENT AT: P769-H, P769-B, P769-E
9–205
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
Paragraph 9–199
All ac essential bus 2 CPG
station circuit breakers
open
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. Check for 115 VAC at
(A402):
J32-A,
J32-B,
J32-C.
Is voltage present?
YES
Repair open wire between:
P461-A and P769-H,
P461-B and P769-B,
P461-C and P769-E.
Go to paragraph 9–199.
NO
Go to step 2.
2. Set BATT/EXT PWR switch to OFF. Check for
short between:
P461-A, P461-B,
P461-C and ground.
Does short exist?
YES
Go to step 3.
NO
Go to paragraph 9–12 to
troubleshoot ac electrical power
generation.
3. Check for short between (A77):
J4-H and ground,
J4-B and ground,
J4-E and ground.
Does short exist?
YES
Go to step 4.
NO
Repair shorted wire between:
P461-A and P769-H,
P461-B and P769-B,
P461-C and P769-E.
Go to paragraph 9–199.
4. Detach wire ends at CB3-A1, CB3-B1, and
CB3-C1. Check for short between (A77):
J4-H and ground,
J4-B and ground,
J4-E and ground.
Does short exist?
YES
Repair shorted wire.
Go to paragraph 9–199.
NO
Go to step 5.
5. Check for short between:
CB3-A1 and ground,
CB3-B1 and ground,
CB3-C1 and ground.
Does short exist?
YES
Replace AWS MTR circuit
breaker (CB3)
(TM 1-1520-238-23).
NO
Go to step 6.
