TM 1-1520-238-T-6
9–665
9–337. MASTER CAUTION/WARNING AND CAUTION/WARNING PANELS – ARE NOT LIGHTED
9–337
WITH PRESS TO TEST INDICATOR PRESSED
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
Paragraph 9–149
Pilot circuit breaker panel
accessing – completed
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. On pilot circuit breaker panel. Check for 28 VDC
at (A76)J1-y.
Is voltage present?
YES
Go to step 2.
NO
Go to paragraph 9–263 to
troubleshoot circuit protection
system (dc emergency bus –
pilot station).
2. On pilot master caution/warning panel, check for
28 VDC at J164-A17.
Is voltage present?
YES
Go to step 3.
NO
Go to step 6.
3. On pilot caution/warning panel, check for
28 VDC at P20-e and P20-d.
Is voltage present?
YES
Go to step 4.
NO
Check for open between:
P20-e and (A326)TB1-12-C,
P20-d and (A326)TB1-12-C.
Repair open wire.
Go to paragraph 9–333.
4. Check for open between:
P20-g and ground
P20-h and ground,
P20-j and J164-A19.
Does open exist?
YES
Repair open wire.
Go to paragraph 9–333.
NO
Go to step 5.
5. Press and hold PRESS TO TEST indicator and
check for open between (DS28):
P1-A17 and P1-A19.
Does open exist?
YES
Replace pilot master
caution/warning panel
(TM 1-1520-238-23).
NO
Replace pilot caution/warning
panel (TM 1-1520-238-23).
6. Check for open between:
J164-A17 and P466-A5.
(A326)J16-A18 and (A326)TB1-12-C,
(A326)J8-L and (A326)TB1-12-D.
Does open exist?
YES
Repair open wire.
Go to paragraph 9–333.
NO
Replace (A326)TB1-12
(TM 1-1520-238-23).
END OF TASK
