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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
Disconnect transformer (T1, T2, T3) secondaries by removing all connections at X
and Y on the terminal block on one of the three transformers. Use a 0-100 range
voltmeter, measure the secondary voltage at X-Y, and record the reading. Reconnect
these connections at X and Y and remove connections at X and Y on another
transformer, disconnect third transformer, and record its voltage output. The voltages
of the three transformers should be essentially the same -- within two or three volts of
each other. If one of the voltages is considerably different from the other two that
transformer is probably defective.
If all three transformers and capacitor 1 prove to be OK and DC is considerably lower
than 77 volts, rectifier is probably defective and should be replaced.
Replace rectifier, capacitor or transformer (para. 3-50).
MACHINE SHOP - ARC WELDER
16. Oil leak (capacitor).
STEP 1. Check for burned out capacitor. Bench test suspected component.
Replace as required (para. 3-54).
17. Melted sealer at bottom of housing.
STEP 1. Check for burned out high voltage capacitor. Bench test suspect component.
Replace as required (para. 3-54).
18. Reduced high frequency output.
STEP 1.
Check if feedback is due to faulty bypass filter.
Replace cracked or leaking
capacitor(s) (para. 3-54 and 3-55).
19. High frequency output (outage).
STEP 1. Check panel switch setting. Must be on START or CONTINUOUS.
Switch to correct setting.
STEP 2. Spark gaps wrong.
Check and reset (.008) (PMCS Table 2-1).
STEP 3. Check for high voltage transformer broken leads.
Replace transformer (para. 3-54).
3-27
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