TM 1-1520-238-T-6
9–738
Change 3
9–389. PILOT GUN INDICATOR – IS NOT LIGHTED WITH GUN SWITCH IN NORM
9–389
POSITION
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 9-1230-476-20-2
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Access provisions –
R90 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. Check for 28 VDC between P18-27 and ground.
Is voltage present?
YES
Refer to paragraph 9–333, to
troubleshoot pilot
caution/warning system.
NO
Go to step 2.
2. Check for 28 VDC between (A62)J3-72 and
ground.
Is voltage present?
YES
Repair open wire between:
P672-72 and P524-A4,
J524-A4 and P18-27.
Go to paragraph 9–364.
NO
Go to step 3.
3. Check for 28 VDC between P672-121 and
ground.
Is voltage present?
YES
Refer to TM 9-1230-476-20-2 to
troubleshoot MRTU.
NO
Go to step 4.
4. Check for 28 VDC between (A77)J2–13 and
ground.
Is voltage present?
YES
Go to step 5.
NO
Refer to paragraph 9–249 to
troubleshoot circuit protection
system DC essential bus 3 –
CPG station.
