TM 1-1520-238-T-6
9–185
9–27.
POWER XFMR RECT 1 CIRCUIT BREAKER (CB1) AND POWER XFMR RECT 2
9–27
CIRCUIT BREAKER (CB4) – DO NOT STAY CLOSED
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
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 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 (A402):
dc emergency bus (TB1-1),
dc essential bus 1 (W1),
dc essential bus 2 (W2),
dc essential bus 3 (W3)
for physical damage (TM 1-1520-238-23).
Is physical damage or foreign material
present?
YES
Replace all damaged buses and
remove all foreign material from
the electrical power distribution
box as necessary
(TM 1-1520-238-23)
NO
Go to step 2.
2. Check (A402):
dc emergency bus (TB1-1),
dc essential bus 1 (W1 and TB1-3),
dc essential bus 2 (W2 and TB1-2),
dc essential bus 3 (W3)
for security of connections (TM 1-1520-238-23).
Are bus and terminal connections secure?
YES
Go to step 3.
NO
Tighten all connections that are
not secure (TM 1-1520-238-23).
3. Check area around buses for foreign material.
Is foreign material present?
YES
Remove all foreign material.
Go to paragraph 9–23.
NO
Replace dc contactor
(TM 1-1520-238-23).
END OF TASK
