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 action7.(Cont)Bad PC board A8,d.Turn on switch S1 on power supply.or mode switchDepress TRANSMITTER RESYNCS3. (Cont)switch S2. Wait about 5 minutesfor system to stabilize. During5-minute stabilization period, checkpower supply. Set multimeter todc volts and connect negative leadto chassis (ground). Connect posi-tive lead to power supply, TB2-3.Meter should indicate 20 ±1 vdc.Connect positive lead to TB2-5.Meter should indicate 5 ±0.25 vdc.Connect lead to TB2-2. Metershould indicate 28 ±2 vdc. Turnmode switch to TEST/RESET andthen to SECURE.e.Set multimeter to dc volts and connectpositive lead to J8-18 and negativelead to chassis. Meter should in-dicate 28 ±2 vdc.(1) If meter indication is not correctat J8-18, connect positive meterlead to power supply TB2-2.Meter should indicate 28 ±2 vdc.(2) If meter does not indicate 28 ±2 vdcat TB2-2, replace power supply.(3) 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; 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 screwnear TB4 (bottom front). Sup-port power supply and turn it5-94
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