TM 1-1520-238-T-6
(9–167 blank)/9–168
Change 8
9–20.
RECT 1 INDICATOR - IS LIGHTED WITH GEN 1 SWITCH OFF
9–20
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
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. Check for 20–70 ohms resistance between
(A402-K1)J1-3 and J1-4 and less than 1 ohm
between (A402-K1)J1-5 and J1-6.
Is resistance correct?
YES
Go to step 2.
NO
Replace ac contactor 1
(TM 1-1520-238-23).
2. Check for open between (A402):
P5-6 and ground,
P5-5 and P5-4,
P5-3 and K7-A2,
K7-A3 and P1-j.
YES
Repair open wire.
Go to paragraph 9–12.
NO
Go to step 3.
3. Check for 28 VDC at (A402-K7)-A3.
Is voltage present?
YES
Go to step 5.
NO
Go to step 4.
4. Check for 28 VDC at (A402)P1-b.
Is voltage present?
YES
Replace GCU 1
(TM 1-1520-238-23).
NO
Go to paragraph 9–23 to
troubleshoot DC electrical power
generation.
5. Check for 28 VDC at (A402)K7-A2.
Is voltage present?
YES
Go to step 6.
NO
Replace external power
contactor (TM 1-1520-238-23).
6. Check for open between (A402)P1-c and P1-k.
Does open exist?
YES
Repair open wire.
Go to paragraph 9–12.
NO
Replace GCU 1
(TM 1-1520-238-23).
END OF TASK
