TM 1-1520-238-T-4
Change 5
6–89
6–29.
TEMP INT INDICATOR – LIGHTS
6–29
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
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Access provisions –
L200, R295, L510,
R510, L545, and
R545 access 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. Detach P200.
Does TEMP INT indicator remain lighted?
YES
Go to step 3.
NO
Go to step 2.
2. Check resistance between P200–U and P200–c.
Is resistance greater than 1 megohm?
YES
Go to step 4.
NO
Replace IGB temperature alarm.
3. Check for short between P18–26 and ground.
Does short exist?
YES
Repair shorted wire between:
P914–A9 and ground,
J449–A19 and ground,
J410–B14 and ground,
P200–c and ground.
Go to paragraph 6–12.
NO
Refer to TM 1-1520-238-T-6 to
troubleshoot the pilot
caution/warning system.
4. Remove IGB thermistor probe RT14
(TM 1-1520-238-23). Check resistance between
P200–C and P200–S.
Is resistance greater than 32k ohms?
YES
Go to step 6.
NO
Go to step 5.
5. Check resistance between P124–9 and
P124–10.
Is resistance greater than 32k ohms?
YES
Repair wire to wire short
between:
P200–C and J124–9,
P200–A and J124–11,
P200–K and J124–13,
P200–E and J124–15.
Go to paragraph 6–12.
NO
Replace IGB thermistor probe
RT14 (TM 1-1520-238-23).
6. Remove IGB thermistor probe RT13
(TM 1-1520-238-23). Check resistance between
P200–A and P200–S.
Is resistance greater than 32k ohms?
YES
Go to step 8.
NO
Go to step 7.
