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TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download

Page 183 of 344

5-9 TM 9-1240-401-34&P 5-11. GENERAL SUPPORT TROUBLESHOOTING MALFUNCTION TEST OR INSPECTION LOCATION CORRECTIVE ACTION CAP ASSEMBLY 1. CAP (1) BINDS OR JUMPS. Observe visually. Replace damaged balls in cap (ref. para 5-17). COUNTER ASSEMBLY 2. AZIMUTH COUNTER (2) AND RESET COUNTER (3) DO NOT OPERATE. Adjust azimuth and reset counter knobs. Repair body (ref. para 5-17). 3. AZIMUTH COUNTER (2) AND RESET COUNTER (3) ARE NOT LEGIBLE. Observe visually. Repair adapter assembly (ref. para 5-23). 4. DIFFERENTIAL GEAR ASSEMBLY NOISY WHEN AZIMUTH KNOB (4) IS OPERATED. Rotate knobs. Repair differential gear assembly (ref. para 5-23). ELBOW ASSEMBLY 5. LENS (5) WILL NOT FOCUS. Observe visually. Repair elbow assembly (ref. para 5-19). 6. LENS (5) IS DAMAGED. Observe visually. Replace lens (ref. para 5-20).