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) g. (Cont) Secure bracket and stop to switch with lock washer and small hex nut. Insert lock through hole in CU door; slip spacer over lock. Slip switch arm over switch shaft. En- sure that arm is aligned with tang on switch stop. Place large hex nut inside switch mounting bracket; En- gage switch shaft in lock. Tighten nut to secure switch. (3) Turn on switch S1 on power sup- ply. Depress TRANSMITTER RESYNC switch S2. Wait about 5 minutes for system to stabilize. During 5-minute stabilization per- iod, check power supply. Set mul- timiter to dc volts and connect neg- ative lead to chassis (ground). Con- nect positive lead to power supply, TB2-3. Meter should indicate 20 � 1 vdc. Connect positive 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 SE - CURE. 2. Nuisance a. Bad tamper a. Close CU door. Ensure that there is no alarms. switch. debris of any sort between door and en- closure. Ensure that door and enclosure are not warped or bent. Ensure that door closes tightly. b. Open CU door. Set multimeter to dc volts and connect positive meter lead to PC board A7, TP1 (brown), and negative lead to chassis (ground). Push TAS plun- ger all the way in, and then pull plunger all the way out. Meter should indicate less than 0.5 vdc for both switch posi- tions. Depress TAS plunger and then re- lease. Meter should indicate 18.5 to 21 vdc. 5-35