TM 1-1520-238-T-4
6–153
6–74.
OIL HOT NOSE GRBX 2 INDICATOR – IS LIGHTED WHEN HOD DISPLAYS NORMAL
6–74
NGB 2 OIL TEMPERATURE (cont)
7. Check for 10 VDC between P672–87 and
P672–86.
Is voltage present?
YES
Refer to TM 9-1230-476-20-2 to
troubleshoot multiplex
subsystem.
NO
Go to step 9.
8. Check for 28 VDC at J60–F.
Is voltage present?
YES
Repair open wire between
J60–G and GS542–A.
Go to paragraph 6–13.
NO
Go to step 10.
9. Check for open between P60–H and P60–J.
Does open exist?
YES
Replace NGB 2 oil temperature
probe (TM 1-1520-238-23).
NO
Go to step 11.
10. Check for open between:
P60–F and P438–A10,
P439–A14 and P463–c.
(A402):
J15–A10 and J21–A14.
Does open exist?
YES
Repair open wire.
Go to paragraph 6–13.
NO
Refer to TM 1-1520-238-T-6 to
troubleshoot circuit protection
system (dc emergency bus –
pilot station)
11. Check for short between P60–H and P60–J.
Does short exist?
YES
Replace NGB 2 oil temperature
probe (TM 1-1520-238-23).
NO
Repair shorted wire between:
J60–H and J524–A13,
J60–J and J524–A14,
J524–A13 and P672–87,
J524–A14 and P672–86.
Go to paragraph 6–13.
END OF TASK
