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Page Title: 7. INSTRUMENT LIGHTS DO NOT OPERATE (CONT)
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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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