TM 9-4120-399-14
Table 4-3. Unit Troubleshooting. (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
8.
WARNING
Disconnect
i n p u t power before
internal
electrical
performing
troubleshooting. Voltages used can
be deadly.
Step 1.
Check for loose or damaged connectors or wires.
Tighten or replace loose or damaged connectors, or repair damaged
wires.
Using wiring diagram Figure 1-4, check electrical connectors at TB2
Step 2.
and individual wires for tightness and continuity.
Tighten, repair, or replace as indicated per para. 4-18.
Step 3.
Check operation of fan motor relay (K7).
Check operation of mode selector switch.
Step 4.
Check operation of fan motor.
Step 5.
Test motor. Repair or replace as needed per para. 4-45.
9.
WARNING
Disconnect
i n p u t power before
performing
internal
electrical
troubleshooting. Voltages used can
be deadly.
Step 1.
Check for loose or damaged wires.
Tighten or replace loose or damaged connectors, or repair damaged
4-32