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 action10. (Cont)a.(Cont)switch S2. Wait about 5 min-utes for system to stabilize.During 5-minute stabilizationperiod, check power supply.Set multimeter to dc voltsand connect negative lead tochassis (ground). Connectpositive lead to power supply,TB2-3. Meter should indicate20 ±1 vdc. Connect positivelead to TB2-5. Meter shouldindicate 5 +0.25 vdc. Connectlead to TB2-2. Meter shouldindicate 28 ±2 vdc. Turn modeswitch to TEST/RESET andthen to SECURE.b.Bad batterya.Set multimeter to dc volts and connectchargerleads to battery terminals, positivecircuit.to red and negative to black. Metershould indicate 28 ±2 vdc.b.If meter does not indicate 28 ±2 vdc, dis-connect wires from battery. Ensurethat they do not touch anything.Connect meter leads to these wires,positive to red and negative to black.Meter should indicate 28 ±2 vdc.c.If this indication is not correct, replacepower supply.(1) To remove power supply, pull maincircuit breaker to remove 120vac from CU. Disconnect wiresfrom battery. As battery isheavy, lift and turn it to removefrom 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 supplyto side of CU enclosure. Becareful not to drop it inside CU.Note cable clamp under screw5-119
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