TM 5-6350-264-14&P-10NAVELEX EE 181-AA-OMI-110/E121 C-9412T.O. 31S9-2FSS9-1-10Table 5-2. Troubleshooting Procedures - ContinuedTroubleProbable causeCorrective action6.(Cont)Improperc.If audible signal device does not sound,operation ofset multimeter to dc volts and con-andible signalnect positive meter lead to powerdevice.supply TB3-3 and negative meter(Cont)lead to TB34.d.If meter indicates 18.5 to 21 vdc, re-place power supply.(1) To remove power supply, pull maincircuit breaker to remove 120vac from CU. Disconnect wiresfrom battery. As battery isheavy, lift and turn to removeit from bottom of CU enclosure.Tag and disconnect wires fromTB2 and TB4. Remove screwsthat secure cover, and removecover. Tag and disconnect wiresfrom TB1. Carefully removescrews that secure power sup-ply to side of CU enclosure. Becareful not to drop it inside CU.Note cable clamp under screwnear TB4 (bottom front). Sup-port power supply and turn it sowires can be tagged and discon-nected from TB3 on bottom ofpower supply.(2) To install new power supply, re-move cover, and turn unit soTB3 is accessible. Supportpower supply, and connectwires to TB3. Turn power sup-ply upright and position it overstandoffs on side of CU enclose-ure. Note that cable clamp goesunder screw on bottom front ofpower supply. Insert screws andtighten to secure power supply.Connect wires to TB1. Replacecover and secure with screws.Connect wires to TB2 and TB4.Position battery outside CU en-closure. Carefully insert batteryend first; turn and lower it into5-89
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