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 TM 55-1905-223-24-18-2
Table 3-2. Troubleshooting-CONT
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NAVIGATION - SEARCHLIGHTS - CONT
STEP 2. Check for bad rectifier in power supply.
Replace rectifier (para. 3-50).
STEP 3. Check for bad transformer in power supply.
Replace transformer (para. 3-50).
14. Lamp fails to start with no internal flashing.
STEP 1. Check for faulty door interlock switch.
Replace door switch (para. 3-47).
WARNING
Dangerous voltage is present at starter connections. Use care in this area.
STEP 2. Check for faulty starter by replacement.
Replace starter (para. 3-49).
STEP 3. Check for faulty transformer.
Replace transformer (para. 3-49).
15. Low or no output from power supply.
STEP 1. Check for defective fuse.
Replace fuse (para. 3-50).
STEP 2.
Check for defective rectifier, capacitor or transformer. Disconnect the outgoing
negative DC wire lead at the terminal block in the power supply. Do not disconnect
the positive lead because if the positive and negative leads are reversed the lamp will
be instantly destroyed.
Measure the no load DC output voltage of the rectifier at the + and -terminal blocks
which should be between 77-140 volts depending upon AC input and transformer
settings. Power supply must be energized and contactor closed; however, do not
energize lamp starter (i.e. do not keep control station switch in START position) while
taking this measurement.
If DC voltage is considerably lower than 77 volts, rectifier, capacitor 1, or one or more
transformers may be defective.
Disconnect capacitor 1 and measure DC output as stated above. A short circuited
capacitor will cause reduced DC output.
3-26
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