TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
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5-58 TM 9-1240-401-34&P 5-26. M117/M117A2 PANORAMIC TELESCOPE FINAL INSPECTION AND ADJUSTMENT - continued k. RESET COUNTER OPERATION AND ADJUSTMENT 1 Reset counter (2) is rotated. (1) must follow when azimuth knob 2 Push in and rotate reset knob (3) to return reset counter (1) to 3200 mils. 3 Replace reset counter (1) (ref. para 5-23) if re- quirements in steps 1 and 2 cannot be met. l. GUNNER’S AID COUNTER OPERATION AND ADJUSTMENT 1 Rotate gunner’s aid knob (1) until a reading of 50 roils appears in gunner’s aid counter (2). Check that reset counter (3) increases 50 mils. 2 Rotate gunner’s aid knob (1) until a reading of 50 roils appears in gunner's aid counter (4). Check that reset counter (3) decreases 50 mils. 3 Replace gunner’s aid counters by replacing hous- ing assembly (5) (ref. para 5-23) if requirements of steps 1 and 2 cannot be met.