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 action1.(Cont)b.(Cont)l.Turn on switch S1 on power supply. De-press TRANSMITTER RESYNC switchS2. Wait about 5 minutes for system tostabilize. During 5-minute stabilizationperiod, check power supply. Set multi-meter to dc volts and connect negativelead to chassis (ground). Connect posi-tive lead to power supply, TB2-3.Meter should indicate 20+1 vdc. Con-nect positive lead to TB2-5. Metershould indicate 5 +0.25 vdc. Connectpositive lead to TB2-2. Meter shouldindicate 20 ± 2 vdc. Turn mode switchto TEST/RESET and then to SECURE.c.Bad tamper cir.-a.Set multimeter to dc volts and connectcuitry (tele-positive meter lead to PC board A7,phone dialer).TP2 (red), and negative lead to chassis(ground).b.If meter indicates 18.5 to 21 vdc, ensurethat there is a jumper between TB7-S-8,TB7, S-8 and S-9. Set multimeter toohms and connect leads to TB7, S-8and TB7, S-9.c.If meter indicates 0 ohms, turn off switchS1 on power supply. Use board ejectorremove PC board A7. Connect meterleads to J7-1 and 7.d.If meter indicates more than 100,000 ohms,inspect J12/P1, pins 19 and 34 for bro-ken or loose wires. Resolder any badconnections on P1.e.If meter indicates 0 ohms at J4 and 7,replace PC board A7.To install new PC board, turn boardso plastic ejector is toward top. Alignboard with guides at top and bottomof status processor. Slide boardstraight in until it contacts receptacleat back of processor. Then pressfirmly on board until it seats com-pletely in receptacle.5-18
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