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ARMY TM 9-4120-381-14
NAVY EE-000-CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
Table 4-2. Unit Maintenance Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. AIR CONDITIONER DOES NOT START IN ANY MODE.
WARNING
Disconnect input power before performing internal electrical troubleshooting. Voltages used can be deadly.
Step 1. Check to see if input power has been disconnected.
Connect input power.
Step 2. Make sure that power is 208 V ac, 3-phase, 50/60 hertz.
Connect correct input power (para 4-13).
Step 3. Check to see if control circuit breaker (CB1) is tripped (para 4-62).
Reset control circuit breaker (CB1).
Step 4. Check operation of control circuit breaker (CB1).
Test control circuit breaker (para 4-62). Replace control circuit breaker, if defective.
Step 5. Check operation of MODE SELECT SWITCH (S1).
Test switch (para 4-56). Replace switch, if defective.
Step 6. Check for loose or damaged electrical connections or damaged wires in wiring harnesses (see Figure
FO-3).
Tighten or replace lugs, or repair damaged wires.
Step 7. Check RFI filter (para 4-42).
Replace bad fuses (para 4-43).
Step 8. Check all terminals (para 4-42) and internal wiring within RFI filter for tightness and damage.
Tighten electrical connections. Perform RFI test (para 4-42). If wires are damaged, replace as
necessary.
WARNING
Disconnect input power before performing internal electrical troubleshooting. Voltage used can be deadly.
Step 9. Check operation of transformer (T1).
Check output (25.2 to 30.8 V ac) and input (120 V ac) voltages (see Figure FO-3); if output voltages
are not correct, test transformer (T1) (para 4-60). Replace transformer, if defective.
Step 10. Check operation of rectifier (CR1).
Test rectifier (para 4-46). Replace defective rectifier.
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