TM 5-6675-326-14
Read voltage meter, frequency scale, incorrect phase or correct phase lamps or correct power input.
If incoming power is correct, proceed to next step. If incorrect, notify appropriate power supply su-
pervisor.
Step 3. Check for 120 V ac output with circuit breaker on
If 120 V ac is present, proceed to next step. If not correct, replace circuit breaker.
Step 4. Remove receptacle and check for 120 V ac into receptacle.
(a) If 120 V ac is present, proceed to next step. If not present, identify defective wire and repair or
replace.
(b) Replace receptacle.
2. ONE ILLUMINATOR DOES NOT WORK.
Step 1. Check for correct voltage range at the potentiometer output terminals
With multimeter leads in place, slowly rotate illuminator knob fully right and fully left. Observe for 0-120
V ac between fully left position and fully right position. If correct, voltage range is present, repair or re-
place wiring between potentiometer and receptacle. If correct voltage range is not present, proceed
to next step.
Step 2. Check for 120 V ac input at potentiometer.
If correct voltage is not present, proceed to next step. If correct voltage is present, replace potentiometer.
Step 3. Check for continuity at wiring between switch and probable defective potentiometer.
(a) If continuity is not present, repair or replace wiring.
(b) If problem continues to exist, use accompanying wiring diagram and continue to troubleshoot wir-
ing until defective wiring is located. Then repair or replace defective wire.
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