TM 1-1520-238-T-6
Change 5
9–223
9–49.
ELECTRICAL POWER – DOES NOT COME ON AFTER EXT PWR RESET SWITCH
9–49
HAS BEEN PRESSED
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
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, press and hold EXT
PWR RESET switch. Check for open between
P13-6 and ground.
Does open exist?
YES
Go to step 2.
NO
Go to step 5.
2. Check for open between P13-6 and P172-B5.
Does open exist?
YES
Repair open wire between:
P172-B5 and (A402)J6-A3,
P13-6 and P430-A3.
Go to paragraph 9–45.
NO
Go to step 3.
3. On pilot ELECT PWR panel, press and hold
EXT PWR RESET switch. Check for open
between (A125)J1-B5 and (A125)J1-B10.
Does open exist?
YES
Repair open wire between
P172-B10 and ground.
Go to paragraph 9–45.
NO
Go to step 4.
4. Check for open between:
(A125)J1-B5 and S3-1,
(A125)J1-B10 and S3-2.
Does open exist?
YES
Replace EXT PWR RESET
switch (TM 1-1520-238-23).
NO
Repair open wire between:
(A125)J1-B5 and S3-1,
S3-2 and S4-2,
(A125)J1-B10 and S4-2.
Go to paragraph 9–45.
5. Check for resistance of approximately 480 ohms
between J14-E and ground.
Is resistance present?
YES
Go to step 6.
NO
Go to step 9.
6. Check for open between J14-F and P13-5.
Does open exist?
YES
Repair open wire.
Go to paragraph 9–45.
NO
Go to step 7.
7. Check for open between:
P13-1 and J14-A,
P13-2 and J14-B,
P13-3 and J14-C.
Does open exist?
YES
Repair open wire.
Go to paragraph 9–45.
NO
Go to step 8.
8. Check for open between P13-4 and ground.
Does open exist?
YES
Repair open wire.
Go to paragraph 9–45.
NO
Replace external power monitor
(TM 1-1520-238-23).
9. Check for open between P172-B7 and J14-E.
Does open exist?
YES
Go to step 10.
NO
Go to step 11.
