TM-9-1240-400-34-P
TELESCOPE; PANORAMIC: M115, ELBOW: M139, MOUNT: M138 AND M137
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
OCTOBER 1993
TM-9-1240-400-34-P - Page 89 of 344
TM 9-1240-400-34&P
3
Rotate azimuth fixture ring (6), counterclockwise,
to 800 mils.
4
Rotate deflection knob (1), clockwise, until
reticles coincide.
If coincidence point is
overtraveled, rotate deflection knob,
counterclockwise, one-half turn past coincidence
point and repeat this step.
5
Deflection counter (3) should increase by 800
mils + 1.0 mil and reset counter (4) should
increase by 800 mils + 1.0 mil.
Record readings.
6
Rotate deflection knob (1) approximately one full
revolution clockwise.
Rotate deflection knob
slowly, counterclockwise, until panoramic reticle
coincides with collimator projector reticle.
Record readings.
Be careful not to overtravel
coincidence point.
If coincidence point is
passed, repeat.
7
Difference between readings in steps 5 and 6 is
amount of backlash and must not exceed 0.5 mil
when read on azimuth counter (5) and 0.75 mil
on reset counter (4).
8
Rotate azimuth fixture ring (6), counterclockwise,
to 1600 mils.
9
Repeat steps 3 thru 7.
Deflection counter (3)
and reset counter (4) should indicate 4800 mils.
10
Repeat steps 3 thru 7 above, every 800 mils,
until head assembly (2) completes 2 full
revolutions.
11
Replace deflection counter (3) if readings
exceed tolerance in step 7.
Refer to page 2-42.
12
Replace reset counter (4) if readings exceed
tolerance in step 7.
Refer to page 2-42.
2-73
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