section”Checking Horizontal Rotation Error”. Readjust as
necessary.Repeat the above checking and adjusting procedures using
the left and right sides of instrument, adjusting the “X” leveling screw
and “X” vial as necessary.
Checking Vertical Rotation Error
1. Set the instrument on its trivet (control button upward) on a floor
approximately 100 feet (30m) from the base of a wall. The right side of
the instrument should face the wall. Level the unit by adjusting the “Y”
leveling screw.
2. Turn power on and place the unit in “STOP” mode.
3. Mark a control point “A” on the wall (Fig. 9). Turn the rotary head manu-
ally until the laser beam hits point A on the wall.
4. Turn the rotary head to move the laser beam 30 feet (9m) upward on the
wall and mark this as point B.
5. Turn the instrument 180° and align the beam to point A, re-leveling if
necessary (Fig. 10).
6. Turn the rotary head to move the laser beam to the same height as point
B, and mark as point C.
No adjustment is necessary if the difference between points B and C is 1⁄8
inch (3mm) or less. Otherwise, adjust as follows.
Correcting Vertical Rotation Error
1. Adjust the “Y” leveling screw until the laser beam rests midway
between points B and C. This will cause the plumb vial bubble to shift
from center.
2. Center the plumb vial bubble by adjusting the vial leveling screws with a
5/64”(2mm) hex key.
3. Recheck the accuracy of vertical rotation by repeating steps 1-6 in sec-
tion”Checking Vertical Rotation Error”. Readjust as necessary.
10 • LM30 Rotary Laser
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