TM 1-1520-238-T-4
6–158
6–78.
TEMP INT INDICATOR – LIGHTS (cont)
6–78
6. Remove IGB thermistor probe RT14
(TM 1-1520-238-23). Check for short between
P200–C and ground.
Does short exist?
YES
Repair shorted wire between
P200–C and thermistor RT14.
Reinstall thermistor
(TM 1-1520-238-23).
NO
Replace IGB thermistor probe
(TM 1-1520-238-23).
7. Check resistance between P200–S and P200–A.
Is resistance greater than 1 megohm?
YES
Go to step 9.
NO
Go to step 8.
8. Remove IGB thermistor probe
(TM 1-1520-238-23). Check for short between
P200–A and ground.
Does short exist?
YES
Repair shorted wire between
P200–A and thermistor RT13.
Reinstall thermistor
(TM 1-1520-238-23).
NO
Replace IGB thermistor probe
(TM 1-1520-238-23).
9. Check resistance between P200–S and P200–K.
Is resistance greater than 1 megohm?
YES
Go to step 11.
NO
Go to step 10.
10. Remove IGB thermistor probe
(TM 1-1520-238-23). Check for short between
P200–K and ground.
Does short exist?
YES
Repair shorted wire between:
P200–K and thermistor RT16.
Reinstall thermistor
(TM 1-1520-238-23).
NO
Replace IGB thermistor probe
(TM 1-1520-238-23).
11. Check resistance between P200–S and P200–E.
Is resistance greater than 1 megohm?
YES
Replace IGB temperature alarm
(TM 1-1520-238-23).
NO
Go to step 12.
12. Remove IGB thermistor probe
(TM 1-1520-238-23). Check for short between
P200–E and ground.
Does short exist?
YES
Repair shorted wire between
P200–E and thermistor RT15.
Reinstall thermistor
(TM 1-1520-238-23).
NO
Replace IGB thermistor probe
(TM 1-1520-238-23).
END OF TASK
