TM 1-1520-238-T-4
Change 5
6–82.11
6–19.
HOD NGB 1 READING – DOES NOT DISPLAY AMBIENT TEMPERATURE
6–19
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-T-6
TM 1-1520-238-23
TM 55-1500-323-24
TM 9-1230-476-20-2
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Access provisions –
L200 access panel and
LN6, L60 fairings open.
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.
NOTE
Nose Gearbox will display higher than
ambient temperature if recently
operated.
Entry in ( ) following pin locations is
multimeter lead orientation.
1. Detach P61. Check for open between:
P61–F and P61–G (red/blk),
P61–J and P61–H (blk/red).
Does open exist?
YES
Go to step 3.
NO
Go to step 2.
2. Check for short between:
P61–F and ground,
P61–G and ground,
P61–H and ground,
P61–J and ground.
Does short exist?
YES
Go to step 3.
NO
Go to step 4.
3. Locate open or short in wire harness between
P61 and MT15.
Can wire harness be repaired?
YES
Repair wiring
(TM 55-1500-323-24).
Go to paragraph 6–13.
NO
Replace MT15
(TM 1-1520-238-23).
Go to paragraph 6–13.
4. Detach P673. Check for short between:
P673–86 and ground,
P673–87 and ground.
Does short exist?
YES
Repair shorted wire between:
P673–86 and ground,
P673–87 and ground
(TM 55-1500-323-24)
NO
Go to step 5.
5. Reconnect P61. Check for open between:
P673–86 and P673–87 (blk/red).
Does open exist?
YES
Repair open wire
(TM 55-1500-323-24).
Go to paragraph 6–13.
NO
Refer to (TM 9-1230-476-20-2)
to troubleshoot multiplex
subsystem.
END OF TASK
