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TM 9-2320-364-20-2
2-1206
7. INSTRUMENT LIGHTS DO NOT OPERATE (CONT).
Instruments operate, indicating
10 to 14 vdc are present at
wires 1276 splice to rheostat.
Wire 1276 OK.
Thumbwheel rheostat switch
OK.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Verify repair.
If instrument lights operate, fault
corrected.
YES
NO
If instrument lights do
not operate, fault not
corrected. Notify DS
Maintenance.
3.
Do instrument lights operate?
Fault corrected.
2.
Replace thumbwheel
rheostat switch
(Para 7-26).
Verify repair, go to
Step 3 of this Fault.
YES
NO
Instruments operate, indicating
10 to 14 vdc are present at
wires 1276 splice to rheostat.
Wire 1276 OK.
Thumbwheel rheostat switch
faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Voltage test.
STE/ICE-R #89.
If 10 to 14 vdc are not
measured, thumbwheel rheostat
switch is faulty.
WARNING
Are 10 to 14 vdc measured on
wire 1052 at thumbwheel
rheostat switch?
Read WARNING
on Page 2-1207
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