TM 1-1520-238-T-5
7–76
7–19.
DUAL HYDRAULIC PRESSURE INDICATOR EDGE–LIGHT – IS NOT LIGHTED
7–19
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68X
Armament/Electrical Systems Repairer
References:
TM 1-1520-238-T-6
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. Check LT PRI circuit breaker.
Does circuit breaker stay closed?
YES
Go to step 2.
NO
Refer to TM 1-1520-238-T-6 to
troubleshoot circuit protection
system (ac essential bus – pilot
station).
2. Check for 5 VDC between P265–A and P265–B.
Is voltage present?
YES
Replace dual hydraulic pressure
indicator (TM 1-1520-238-23).
NO
Go to step 3.
3. Check for 5 VDC between (A326):
J9–A1 and J9–A2.
Is voltage present?
YES
Repair open wire between:
P265–A and P487–A1,
P265–B and P487–A2.
Go to paragraph 7–10.
NO
Go to step 4.
4. Check for 5 VDC between (A326):
TB1–31–C and TB1–32–C.
Is voltage present?
YES
Go to step 5.
NO
Refer to TM 1-1520-238-T-6 to
troubleshoot pilot edge–lights.
5. Check for resistance between (A326):
R3–1 and R3–3.
Is resistance present?
YES
Repair open wire between
(A326):
J9–A1 and R3–1,
J9–A2 and TB1–32–C,
R3–3 and TB1–31–C.
Go to paragraph 7–10.
NO
Replace resistor (A326)R3
(TM 1-1520-238-23).
END OF TASK
