TM 1-1520-238-T-6
9–480
9–217. 28 VDC – IS NOT PRESENT AT P763-D
9–217
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
Electrical power
distribution box cover
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. On pilot ELEC PWR panel, set BATT/EXT PWR
switch to EXT PWR. Check for 28 VDC at
(A402)J32-K.
Is voltage present?
YES
Repair open wire between
P461-K and P763-D.
Go to paragraph 9–215.
NO
Go to step 2.
2. Open CB2 and set BATT/EXT PWR switch to
OFF. Check for short between P461-K and
ground.
Does short exist?
YES
Go to step 3.
NO
Go to paragraph 9–23 to
troubleshoot dc electrical power
generation.
3. Check for short between (A97)J2-D and ground.
Does short exist?
YES
Go to step 4.
NO
Repair shorted wire between
P461-K and P763-D.
Go to paragraph 9–215.
4. Detach wire ends at CB2-A1. Check for short
between (A97)J2-D and ground.
Does short exist?
YES
Repair shorted wire between
(A97)J2-D and CB2-A1.
Go to paragraph 9–215.
NO
Go to step 5.
5. Check for short between CB2-A1 and ground.
Does short exist?
YES
Replace TADS DC circuit
breaker (CB2)
(TM 1-1520-238-23).
NO
Go to step 6.
6. Attach wires at CB2-A1 and detach wire ends at
CB2-B1. Check for short between (A97)J2-D
and ground.
Does short exist?
YES
Repair shorted wire between
CB2-A1 and CB2-B1.
Go to paragraph 9–215.
NO
Go to step 7.
7. Check for short between CB2-B1 and ground.
Does short exist?
YES
Replace TADS DC circuit
breaker (CB2)
(TM 1-1520-238-23).
NO
Go to step 8.
