TM 1-1520-238-T-4
6–160
Change 5
6–79.
TEMP TR INDICATOR – LIGHTS (cont)
6–79
6. Remove TGB thermistor probe RT7
(TM 1-1520-238-23). Check for short between
P201–A and ground.
Does short exist?
YES
Repair shorted wire between
P201–A and thermistor RT7.
Reinstall thermistor
(TM 1-1520-238-23).
NO
Replace TGB thermistor probe
(TM 1-1520-238-23).
7. Check resistance between P201–S and
P201–C.
Is resistance greater than 1 megohm?
YES
Go to step 9.
NO
Go to step 8.
8. Remove TGB thermistor probe RT8 RH
(TM 1-1520-238-23). Check for short between
P201–C and ground.
Does short exist?
YES
Repair shorted wire between
P201–C and thermistor RT8.
Reinstall thermistor
(TM 1-1520-238-23).
NO
Replace TGB thermistor probe
(TM 1-1520-238-23).
9. Check resistance between P201–S and P201–K.
Is resistance greater than 1 megohm?
YES
Go to step 11.
NO
Go to step 10.
10. Remove TGB thermistor probe
(TM 1-1520-238-23). Check for short between
P201–K and ground.
Does short exist?
YES
Repair shorted wire between
P201–K and thermistor RT10.
Reinstall thermistor
(TM 1-1520-238-23).
NO
Replace TGB thermistor probe
(TM 1-1520-238-23).
11. Check resistance between P201–S and P201–E.
Is resistance greater than 1 megohm?
YES
Replace TGB temperature alarm
(TM 1-1520-238-23).
NO
Go to step 12.
12. Remove TGB thermistor probe
(TM 1-1520-238-23). Check for short between
P201–E and ground.
Does short exist?
YES
Repair shorted wire between
P201–E and thermistor RT9.
Reinstall thermistor
(TM 1-1520-238-23).
NO
Replace TGB thermistor probe
(TM 1-1520-238-23).
END OF TASK
