TM 1-1520-238-T-6
9–190
9–32.
DC ESSENTIAL BUS 2 – DOES NOT HAVE POWER
9–32
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
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 for 28 VDC at dc contactor bus 2
terminal.
Is voltage present?
YES
Go to step 4.
NO
Go to step 2.
2. Check for open between P14-6 and ground.
Does open exist?
YES
Repair open wire.
Go to paragraph 9–23.
NO
Go to step 3.
3. Check for 28 VDC at T/R 1 and T/R 2 input
terminals on dc contactor.
Is voltage present?
YES
Replace dc contactor
(TM 1-1520-238-23).
NO
Repair open wire between:
T/R 1 positive terminal and T/R
1 input,
T/R 2 positive terminal and T/R
2 input.
Go to paragraph 9–23.
4. Check mounting of (A402):
TB1-2 on bus bar W2 for security ().
Is mounting secure?
YES
Go to step 5.
NO
Secure terminal board and bus
bar (TM 1-1520-238-23).
5. Check (A402):
TB1-2 on bus bar W2 for physical damage
(TM 55-1520-238-23).
Is physical damage present?
YES
Replace bus bar (A402)W2
(TM 1-1520-238-23).
NO
Replace terminal board
(A402)TB1-2
(TM 1-1520-238-23).
END OF TASK
