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KNOCKING NOISE COMING FROM COMPRESSOR
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TM-5-6640-213-14 Laboratory Air Mobile Aviation Fuel NSN
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COMPRESSOR RUNS CONTINUOUSLY - TM-5-6640-213-140133
TM 5-6640-213-14
Table 4-2. Ice Maker Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
29. ICE MAKER MECHANISM IS NOT DEFROSTING AUTOMATICALLY.
Defective temperature control.
Step 1.
Adjust or replace temperature control (para. 4-5e.).
Check for timing cam malfunction.
Step 2.
Adjust timing cam (See 18 above).
30. ICE AND FROST BUILDUP ON SECONDARY EVAPORATOR AROUND THE
SIDE WALL.
Ice maker has not been defrosted. The secondary evaporator will not
defrost automatically.
Defrost ice maker.
31. ICE MAKER FAILS TO REFRIGERATE.
Check if freon is leaking from compressor.
Inspect compressor for leak. Refer to refrigerator maintenance
personnel.
32. HIGH PITCH OR RINGING NOISE IN UNIT COMPARTMENT.
Step 1.
Check if fan blade is at the wrong pitch.
Disconnect electrical power to ice maker. Bend each fan blade
one-quarter to one-half inch to the rear, this will cause the
blades to cut the air at a different angle eliminating the
ringing noise.
Step 2.
Check if copper refrigeration tube is touching the cabinet,
causing noise as unit vibrates.
Adjust copper refrigeration tube away from cabinet.
4-18

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