TM 1-1520-238-T-6
9–664
9–336. PRESS TO TEST INDICATOR – IS NOT LIGHTED
9–336
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
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 EXT/INTR LT panel, place INST control
to BRT. Check for 5 VDC at J164-A20.
Is voltage present?
YES
Go to step 2.
NO
Go to step 3.
2. Check for open between:
P20-W and J164-A20,
P20-V and J164-B3.
Does open exist?
YES
Repair open wire.
Go to paragraph 9–333.
NO
Go to step 3.
3. On pilot caution/warning panel, check for
28 VDC at P20-e and P20-d.
Is voltage present?
YES
Go to step 4.
NO
Go to step 5.
4. Check for open between:
P20-g and ground,
P20-h and ground.
Does open exist?
YES
Repair open wire.
Go to paragraph 9–333.
NO
Replace pilot master
caution/warning panel
(TM 1-1520-238-23).
5. On pilot circuit breaker panel, check for 28 VDC
at (A76)J1-y.
Is voltage present?
YES
Check for open between:
(A326)TB1-12-B and P20-d,
(A326)TB1-12-C and P20-e,
(A326)TB1-12-D and P463-y.
Repair open wire.
Go to paragraph 9–333.
NO
Go to paragraph 9–263 to
troubleshoot circuit protection
system (dc emergency bus –
pilot station).
END OF TASK
