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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 - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
WARNING
Disconnect input power before performing internal electrical troubleshooting.
Voltages used can be deadly.
8. EXCESSIVE NOlSE - Continued.
Step 2. Check fans for looseness or damage, and for rotational clearance.
Tighten loose fans (para 4-71 and 4-77).
Step 3. Check all internal components for looseness, vibration, and security.
Tighten, adjust, and secure as necessary.
9. FAULT RESET SWITCH (S12) DOES NOT RESET.
WARNING
Disconnect input power before performing internal electrical troubleshooting.
Voltages used can be deadly.
Step 1. Check operation of reset switch (S12).
Test switch (para 4-59). Replace switch, if defective.
Step 2. Check operation of fault relay (K6).
Test relay (para 4-49). Replace relay, if defective.
Step 3. Check operation of relay (K6).
Test socket (para 4-50). Replace socket, if defective.
Step 4. Check operation of suppression diode (CR11).
Test diode (para 4-47). Replace diode, if defective.
10. DIRTY FILTER LIGHT (DS2) ON.
Step 1. Check return air filter.
Clean filter (para 3-5).
Step 2. Check operation of dirty filter relay (K20).
Test relay (para 4-49). Replace relay, if defective.
Step 3. Check operation of relay (K20) 11-pin socket.
Test socket (para 4-50). Replace socket, if defective.
Step 4. Check operation of suppression diode (CR5).
Test diode (para 4-47). Replace diode, if defective.
Step 5. If dirty filter light is still on, unit has possible defective air flow switch (S3).
Test dirty filter switch (S3) (para 4-82). Replace dirty filter switch, if defective.
4-27
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