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 action4. (Cont)c. (Cont)28 +2 vdc. Turn mode switch toTEST/RESET and then to SECURE.d. Incorrecta.Set multimeter to dc volts and connectsupplypositive meter lead to PC board A1-TP1voltage or(brown), and negative lead to chassisbad tamper(ground). Turn mode switch to SE-circuitry.CURE and ensure that no alarms areactivated. Meter should indicate18.5 to 21 vdc.b.If meter indicates less than 1 vdc, turn modeswitch to ACCESS. Connect positivemeter lead to power supply TB2-3.Meter should indicate 20 + 1 vdc. Con-nect meter lead to TB2-5. Metershould indicate 5 +0.25 vdc. Con-nect meter lead to TB2-2. Metershould indicate 28 +2 vdc.c.If any of these indications are not correct,turn off switch S1 on power supply.Check wiring for poor or loose con-nections, broken wires, or frayed in-sulation. Repair or replace any badwiring.d.If wiring is good, replace power supply.(1) To remove power supply, pull main,circuit breaker to remove 120 vac fromCU. Disconnect wires from battery.As battery is heavy, lift and turn toremove it from bottom of CU enclose-ure. Tag and disconnect wires fromTB2 and TB4. Remove screws thatsecure cover, and remove cover. Tagand disconnect wires from TB1. Care-fully remove screws that secure powersupply to side of CU enclosure. Becareful not to drop it inside CU. Notecable clamp under screw near TB4(bottom front). Support power supplyand turn it so wires can be tagged anddisconnected from TB3 on bottom ofpower supply.5-57
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
