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 2. (Cont) d. (Cont) (1) If meter indication is correct, install new PC board A8. (2) To install new PC board A8, turn off switch S1 on top of power supply, turn board so plastic ejector is to- ward top. Align board with guides at top and bottom of status proces- sor. Slide board straight in until it contacts receptacle at back of pro- cessor. Then press firmly on board until it seats completely in recepta- cle. (3) Turn on switch S1 on power supply. Depress TRANSMITTER RESYNC switch S2. Wait about 5 minutes for system to stabilize. Turn mode switch to TEST/RESET and then to SECURE. g. If meter does not indicate 18.5 to 21 vdc at J8-16, connect positive meter lead to mode switch S3, terminal 2-1, and neg- ative meter lead to chassis. Meter should indicate 20 ±1 vdc. h. If meter indicates 0 v, connect positive lead to S3, terminal 2-4, but not at 2-1. i. If meter indicates 20 +1 vdc, replace mode switch S3. (1) To remove mode switch, turn off switch S1 on top of power supply. Remove large hex nut that secures switch mounting bracket to inside of CU door. Remove switch and mounting bracket together. Be careful not to lose switch arm be- cause it is not secured to switch shaft. Remove spacer and lock from door so no items will be lost. Remove small hex nut and lock washer that secures mounting bracket and switch stop to switch shaft. Remove mounting bracket 5-44