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) e. (Cont) b. If there are no alarms indicated at any test point, turn mode switch to SE- CURE. Set multimeter to ohms and connect leads to TB6, terminals S1-I and S1-IR. Meter should indicate less than 2,000 ohms. c. If meter indicates more than 100,000 ohms, remove PC board A10. To re- move 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. d. Turn on switch S1 on top of power sup- ply. Depress TRANSMITTER RESYNC switch S2. Wait about 5 minutes for sys- tem to stabilize. Turn mode switch to TEST/RESET and then to SECURE. Connect meter leads to J10-13 and 14. If meter indicates less than 2,000 ohms, replace PC board A10. If meter indicates more than 100,000 ohms, replace PC board A9. (1) To remove PC board A9, 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 boards A9 and A10, turn board so plastic ejector is toward top. Align board with guides at top and bottom of status processor. Slide board straight in until it contacts receptacle at back of processor, then press firmly on board until it seats completely in receptacle. e. Turn on switch S1 on top of power sup- ply. Connect meter leads to TB6, termi- nals S1-D and S1-DR. Meter should indi- cate less than 2,000 ohms. 5-26