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TM 55-1905-223-24-18-2
Table 3-2. Troubleshooting - CONT
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ROTARY WINDOW - CONT
STEP 4. Check air chamber drain holes.
a. Remove spinning frame assembly (para. 3-193). Dry out entire chamber with a soft
clean cloth.
b.  Check drain holes in the bottom of the fixed frame.  Holes should be free of
obstructions. If holes are plugged up, clean out both holes with a small piece of wire.
Be sure holes are entirely clean before reassembly. Remount spinning frame.
57. Unit vibrates excessively.
STEP 1. Check motor shaft taper for dirt, corrosion, etc.
Remove spinning frame from motor shaft, clean shaft and inside of tapered hole, remount
spinning frame assembly (para. 3-193).
STEP 2. If unit still vibrates.
Replace spinning frame assembly (para. 3-193).
58. Control box is defective.
NOTE
Turn both switches OFF before proceeding.
STEP 1. Check for 115 Vac across terminals 1 and 2.
If voltage is not present, ship's wiring is defective.
Refer to ELECTRICAL
TROUBLESHOOTING.
STEP 2. Be sure a MOTOR circuit breaker is depressed. Check for 115 Vac across points A
and B.
If voltage is not present, motor circuit breaker is defective. Replace motor circuit breaker.
STEP 3. Be sure HEATER circuit breaker is depressed. Check for 115 Vac across point C and
terminal 5.
If voltage is not present, heater circuit breaker is defective. Replace heater circuit breaker.
STEP 4. Turn MOTOR switch ON, check for 115 Vac across points D and E.
If voltage is not present, motor switch is defective. Replace motor switch (para. 3-193).
STEP 5. Check for 115 Vdc across terminals 3 and 4.
If voltage is not present, rectifier is defective. Replace rectifier (para. 3-193).
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