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) a. (Cont) period, check power supply. Set multi- meter to dc volts and connect negative lead to chassis (ground). Connect posi- tive lead to power supply, TB2-3. Meter should indicate 20 +1 vdc. Connect posi- tive lead to TB2-5. Meter should indicate 5 +0.25 vdc. Connect lead to TB2-2. Meter should indicate 28 ±2 vdc. Turn mode switch to TEST/RESET and then to SECURE. b. Bad tamper a. Set multimeter to dc volts and connect alarm circui- positive meter lead to PC board A7, try or TAS. TP1 (brown), and negative lead to chas- sis (ground). Push TAS plunger all the way in, and then pull plunger all the way out. Meter should indicate less than 0.5 vdc for both switch positions. De- press TAS plunger and then release. Meter should indicate 18.5 to 21 vdc. b. If these meter indications are not correct, turn off switch S1 on top of power sup- ply. Use board ejector to remove PC board A7. Set multimeter to ohms and connect meter leads to TAS terminals which have wires attached. Push TAS plunger all the way in, and then pull plunger all the way out. Meter should indicate 0 ohms for both switch posi- tions. Depress TAS plunger and then release. Meter should indicate over 100,000 ohms. c. If these meter indications are not cor- rect, replace TAS. (1) To remove TAS, remove two screws that secure TAS to edge of CU housing. Loosen screws that secure crimp lugs to switch. (2) To install new TAS, slip crimp lugs under screw heads marked COM and NO on switch, and tighten screws. Insert switch through hole in edge of housing from the 5-16