Johnson Level & Tool Mfg. 40-6687 - Manual (Page 21)

©2012 Johnson Level & Tool 21
Dot Accuracy
1. With the laser on its base and set on a flat platform, turn the
laser on.
2. Mark the down beam location and use this as your reference
point.
3. Locate the up beam and mark its point as ‘A’.
4. Rotate the laser (not moving the base) 180° by swiveling the laser
on its base and mark the up beam location as ‘B’.
5. Rotate the laser 90° and mark the up beam as ‘C’.
6. Rotate the laser 180° and mark the up beam as ‘D’.
Note: Do not move the base, and always have the down beam in
the same location.
7. Connect the four dots. Connect A to B, and C to D.
8. If the center point ‘E’ is more than 1/8” at 50’, or 1/32” at 24.5’
from points A,B, C, and D, the unit needs to be recalibrated.
Fine Calibration
1. Remove plastic screws on front and left of the laser.
2. With the unit on its base, and on a flat surface, turn the laser on.
3. Return the laser back to its original starting point from the self
check.
4. Use a 2mm allen wrench to turn the front adjusting screw to
position the laser beam forward and backward.
5. Use the side adjusting screw to position the laser beam left
and right.
6. Move the top beam to the intersection of the 4 dots.
6339H_Manuals 10/24/12 12:56 PM Page 21