M2A2
AIMING
CIRCLE
3 If circular level bubble does not stay centered, repeat steps 1 and 2 above.
4 Uncover main housing
tube level. Adjust leveling screw knobs until bubble
in main housing tube level is centered.
5 Turn aiming circle in azimuth.
Watch the bubble in the main housing tube level.
The bubble must stay centered while the aiming circle is turned
through 6400 mils. Spot check at 1600-mil intervals.
6 If the bubble in the main housing tube level does not stay centered:
Turn leveling screw knobs to center bubble in main housing tube
level.
Turn aiming circle in azimuth to another azimuth setting.
Again turn leveling screw knobs to center bubble in main housing
tube level.
Repeat the turning of the aiming circle in azimuth and the turning of
the leveling screw knobs, as necessary.
The main housing tube level bubble must remain centered while
the aiming circle is turned through 6400 mils. Spot check at 1600-
mil intervals.