TM 1-1520-238-T-6
9–408
9–167. POWER XFMR RECT 1 CIRCUIT BREAKER (CB1) – DOES NOT STAY CLOSED
9–167
OR CONTINUITY DOES EXIST BETWEEN: P3-K AND P3-S, P3-L AND P3-T,
P3 -M AND P3-U
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 ELEC PWR panel, set BATT/EXT PWR
switch to EXT PWR.
Does POWER XFMR RECT 1 circuit breaker
(CB1) stay closed?
YES
Go to step 4.
NO
Go to step 2.
2. Open CB1. Set BATT/EXT PWR switch to OFF.
Check for short between:
P3-S and ground,
P3-T and ground,
P3-U and ground.
Does short exist?
YES
Go to step 3.
NO
Go to paragraph 9–23 to
troubleshoot dc electrical power
generation.
3. Detach wire at CB1-A2, CB1-B2, and CB1-C2.
Check for short between:
P3-S and ground,
P3-T and ground,
P3-U and ground.
Does short exist?
YES
Repair shorted wire.
Go to paragraph 9–150.
NO
Replace POWER XFMR RECT
1 circuit breaker (CB1)
(TM 1-1520-238-23).
4. Set BATT/EXT PWR switch to OFF. Check for
open between:
CB1-A1 and P3-K,
CB1-B1 and P3-L,
CB1-C1 and P3-M,
CB1-A2 and P3-S,
CB1-B2 and P3-T,
CB1-C2 and P3-U.
Does open exist?
YES
Repair open wire.
Go to paragraph 9–150.
NO
Replace POWER XFMR RECT
1 circuit breaker (CB1)
(TM 1-1520-238-23).
END OF TASK
