TM-9-1240-400-34&P Technical Manual for M109 Telescopes and Mounts Download
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TM 9-1240-400-34&P 2 While sighting through eyepiece (3), rotate deflection knob (4) and elevation knob (5), until reticle coincides with projector collimator (6). 3 Rotate azimuth ring (1) 800 mils, counterclockwise. 4 Rotate deflection knob (4), clockwise, until reticles coincide. 5 Check that line of sight does not deviate from horizontal by more than 1.0 mil. 6 Rotate deflection knob (4), clockwise, approximately one-half revolution while observing reticle. 7 Rotate deflection knob (4) slowly, counterclockwise, until reticles coincide. 8 Check that line of sight changes no more than 0.5 mil from reading in step 5. 9 Repeat steps 3 thru 8 until head assembly (7) has made 2 full revolutions. 10 If level travel exceeds tolerance specified on page 2-74, check mounting surfaces of M115 panoramic telescope (8) and adapter fixture (9) for dirt, nicks, or burrs. If none of above conditions exist, adjust optic cell assembly. Refer to page 2-50. CAUTION Overtightening of plugs will cause binding in deflection mechanism. 11 Check lift tolerance. If lift exceeds tolerance specified on page 2-74, loosen setscrews and tighten plugs in cover (10). 2-75