TM 1-1520-238-T-7
11–412
Change 5
11–117. AUDIO TONE – IS STILL HEARD AFTER RESET PUSHBUTTON IS PRESSED
11–117
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Extractor, Relay
CTJ-RO6
Personnel Required:
68X
Armament/Electrical Systems Repairer
One person to assist
References:
TM 1-1520-238-T-6
TM 1-1520-238-23
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Access provisions –
L325, T290L, T290R
and L140 doors 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.
1. Open STAB MAN DC (A76)CB6, STAB AUTO
DC (A76)CB3, STAB AUTO AC (A76)CB2, and
ENG WARN (A76)CB52 circuit breakers.
Detach J993 from (A641)P993.
Check for open between J993–F and GS394–C.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Go to step 2.
2. On PLT MAN STAB CONT switch (A641), hold
pilot RESET switch ON.
Check for open between P993–F and P993–E.
Does open exist?
YES
Replace pilot RESET switch
(A641) (TM 1-1520-238-23).
NO
Go to step 3.
3. Detach P429 from (A402)J23.
Check for open between J993–E and P429–B8.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Go to step 4.
4. Detach P431 from (A402)J27.
Set multimeter to diode setting. Place black
meter lead on (A402)J23–B8. Check for open
between (A402)J23–B8 and (A402)J27–A20.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88, or
replace diode
(TM 1-1520-238-23).
NO
Go to step 5.
5. Detach:
P431 from (A402)J27,
P491 from (A402)J8,
P1077 from (A329)J2,
P469 from (A326)J2.
Check for open between:
P431–A20 and P491–A18,
(A323)J6–A18 and (A323)TB2–2–A,
(A323)TB2–2–G and (A323)J6–A20,
P491–A20 and P1077–H,
(A329)J1–H and (A329)XK1–6–X2,
(A329)P1077–D and (A329)XK1–6–X1,
P1077–D and P469–A18,
(A326)J2–A18 and (A326)TB1–51–F.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Go to step 6.
