Troubleshooting Procedures

TM 5-6350-264-14&P-10 NAVELEX EE 181-AA-OMI-110/E121 C-9412 T.O. 31S9-2FSS9-1-10 Table 5-2. Troubleshooting Procedures - Continued Trouble Probable cause Corrective action 1. (Cont) d. (Cont) (3) Turn on switch S1 on power sup- ply. Depress TRANSMITTER RESYNC switch S2. Wait about 5 minutes for system to stabilize. Turn mode switch to TEST/RE- SET and then to SECURE. q. If meter indicates 20 + 1 vdc at S3, ter- minal 2-1, replace PC board A10. (1) To remove PC board A10, turn off switch S1 on top of power supply. Place thumb or finger under board ejector and lift up until board pops out of receptacle at back of status processor. Then grasp PC board and pull straight out. (2) To install new PC board A10, turn board so plastic ejector is toward top. Align board with guides at top and bottom of status proces- sor. Slide board straight in until it contacts receptacle at back of processor. Then press firmly on board until it seats completely in receptacle. (3) Turn on switch S1 on power sup- ply. Depress TRANSMITTER RESYNC switch S2. Wait about 5 minutes for system to stabilize. Turn mode switch to TEST/RE- SET and then to SECURE. e. Bad alarm a. Tag, remove, and isolate any wires or identification jumpers from TB6, terminals S1-I, S1-IR, circuitry. S1-D, and S1-DR to Data Transmitter or Monitor Cabinet. Ensure that no LED’s are lighted. Set multimeter to dc volts and connect negative lead to chassis (ground). Connect positive lead to TP1 (brown), and then to TP2 (red), on each PC board, A1, A2, A3, A4, A5, A6, and A7. A meter indication of 18.5 to 21 vdc on either test point on any of these PC boards indicates an alarm condition. Less than 0.5 vdc indicates a non-alarm con- dition. 5-25