Troubleshooting Procedures

TM 5-6350-264-14&P-10 NAVELEX EE 181-AA-OMI-110/E121 C-9412 T.O. 31S9-2FSS9-1-10 Table 5-2. Troubleshooting Procedures - Continued Trouble Probable cause Corrective action 2. (Cont) c. (Cont) d. If wiring is good, replace power supply WARNING High voltage is used in the oper- ation of this equipment. Death on contact may result if personnel fail to observe safety precautions. A 115-volt ac potential may cause death under certain conditions; therefore, precautions should be taken at all times. Be careful not to contact connections for 115- volt ac input when installing or repairing this equipment. Never work on electronic equip- ment unless there is another per- son nearby who is familiar with the hazards of the equipment and who is competent in administering first aid. e. If alarms occur immediately after a volt- age change, set meter to ac volts and CAREFULLY connect leads to power supply TB1-1 and TB1-2. Meter should indicate 110 to 125 vac. f. If ac voltage is stable, replace power sup- ply. (1) To remove power supply, pull main circuit breaker to remove 120 vac from CU. Disconnect wires from battery. As battery is heavy, lift and turn it to remove from bottom of CU enclosure. Tag and discon- nect wires from TB2 and TB4. Re- move screws that secure cover, and remove cover. Tag and discon- nect wires from TB1. Carefully re- move screws that secure power sup- ply to side of CU enclosure. Be careful not to drop it inside CU. Note cable clamp under screw near 5-39