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.ImproperBad PC board A8,a.Turn mode switch to ACCESS. Set mul-operation ofor mode switchtimeter to dc volts and connectACCESSS3.positive lead to terminals 7 andmode.negative lead to terminal 6 onTB9-A, and TB10-B, and TB11-C,and TB12-D, and TB13-E in turn.Meter should indicate 28 ±2 vdcon each terminal board.b.If meter indications are not correct onsome terminal boards, turn offswitch S1 on power supply. Re-move PC board A8. Lift boardejector until board pops out ofreceptacle and then pull boardstraight out. Set multimeter toohms and connect leads tochassis and terminal 6 on terminalboards where voltage was incorrect.Meter should indicate 0 ohms. Con-nect meter leads to J8-17 and term-inal 7 of terminal board where vol-tage was incorrect. Meter shouldindicate 0 ohms.(1) If meter does not indicate 0 ohmswhen connected to terminal 6,inspect jumper wires from ter-minal 6 to 5 to 2 and wires toground for broken or loose con-nections.(2) If meter does not indicate 0 ohmswhen connected to terminal 7,inspect wires from terminal 7to J12/P1 pin 24 to J8-17 forbroken or loose connections.Resolder any bad connectionson P1.c.If meter indications are correct on allterminal boards, turn off switch S1on power supply. Remove PCboard A8. Lift board ejector un-til board pops out of receptacleand then pull board straight out.5-93
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