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 action8.(Cont)Bad alarmf.If meter indicates 20 vdc at J11-17,identificationreplace faulty PC boards A11 orcircuitry.A12.(Cont)(1) To remove PC boards A11 and A12,turn off switch S1 on top ofpower supply. Place thumb orfinger under board ejector onA11 and lift up until boardpops out of receptacle at back ofstatus processor. Then grasp PCboard and pull straight out.Carefully pull A11 and A12apart.(2) To install new PC board A11 andA12, align sockets on A12 withpins on A11. Carefully pressboards together until pins arefully engaged in sockets. En-sure that pins on A11 are notbent or otherwise damaged.Turn PC board A11 so plasticejector is toward top. Alignboard with guides at top andbottom of status processor.Slide board straight in until itcontacts receptacle at back ofprocessor. Then press firmlyon board until it seats com-pletely in receptacle.(3) Turn on switch S1 on power sup-ply. Depress TRANSMITTERRESYNC switch S2. Waitabout 5 minutes for systemto stabilize. During 5-minutestabilization period, checkpower supply. Set multimeterto dc volts and connect nega-tive lead to chassis (ground).Connect positive lead to powersupply, TB2-3. Meter shouldindicate 20 ±1 vdc. Connectpositive lead to TB2-5. Metershould indicate 5 ±0.25 vdc.Connect lead to TB2-2. Meter5-103
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