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TM5-4120-387-14
TABLE 4-2. TROUBLESHOOTING (Cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2.
Check operation of fan
Test relay.
(See
Step 3.
Check operation of fan
Test capacitor.
defective.
Step 4.
Check operation of fan
Test motor.
(See
motor relay (K7).
para 4-54.) Replace relay if defective.
motor capacitor (C4).
See para 4-50.) Replace capacitor if
motor (B2).
para 4-60.) Notify your supervisor and Direct
Support Maintenance if motor is defective.
Step 5.
Check operation of mode selector switch (S).
Test switch.
(See para 4-47.) Replace switch if defective.
10.
EXCESSIVE NOISE WHEN COMPRESSOR STARTS.
If a knocking or hammering sound is heard when compressor
starts, turn mode selector switch to OFF, immediately.
Such noise is usually caused by liquid refrigerant in
compressor, which can seriously damage or destroy
compressor.
Notify your supervisor and Direct Support
Maintenance.
11.
EXCESSIVELY NOISY OPERATION.
Step 1.
Isolate source of noise as near as possible, both by ear and touch.
Listen and feel at both front and back of
Step 2.
Check fans for looseness or damage, and for rot
Tighten loose fans, adjust for rotational
fans.
(See para 4-58 and 4-59.)
Step 3.
Check all internal components for looseness, vi
security.
Tighten, adjust, and secure as necessary.
cabinet.
ational clearance.
clearance, or replace
bration, and
4-49
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