TM 10-6640-215-13 SECTION IV.  UNIT TROUBLESHOOTING PROCEDURES 4-9. UNIT TROUBLESHOOTING PROCEDURES. Unit troubleshooting procedures listed in Table 4-2 cover the most common malfunctions that may be repaired at the unit level.    Repair  or  adjustment  requiring  specialized  equipment  is  not  authorized  unless  such  equipment  is  available. Troubleshooting procedures used by the operator should be conducted in addition to the unit troubleshooting procedures. This  manual  cannot  list  all  the  possible  malfunctions  or  every  possible  test/inspection  and  corrective  action.    If  a malfunction is not listed or corrected by a listed corrective action, notify your supervisor. Table 4-1.  Symptom Index Troubleshooting Table Item Number Title 1 No electrical power to laboratory (generator output switch on and power cable properly connected). 2. Fluorescent light bulb fails to light (other bulbs in fixture light). 3. Emergency light fails to come on when normal power is lost. 4. No power available in Petroleum Laboratory (purge cycle took place and circuit breaker A1CB1 placed in ON position). 5. A group of ceiling lights fail to operate (all other ceiling lights operate). 6. Door interlock (micro) switch does not operate properly. 7. Convenience outlet (receptacle) inoperative. 8. A/C (ECU) remote control unit fails to operate properly (power available). 9. Environmental Control Unit fails to operate properly (power available). 10. Purge damper (intake, exhaust, or ECU intake) fails to operate. 11. Purge door limit switch fails to operate. 12. Air compressor motor fails to run (power available to motor controller). 13. Leaks in system cause compressor to cycle on and off. 14. Air pressure switch causing compressor to cycle on and off. 15. Vacuum pump motor fails to run (power available to motor controller). 4-11