Johnson Level & Tool Mfg. 40-6687 - Manual (Page 22)

22 ©2012 Johnson Level & Tool
7. Perform another self check calibration as described previously to
make sure the laser is calibrated.
8. If the laser is still beyond its accuracy specification, recalibrate the
laser again.
9. If laser is still out of calibration, contact Johnson Level & Tool for
service.
10. Return the plastic screws, being careful not to over-tighten.
Self-checking the 3 Horizontal Beams
1. As shown in Fig. 1, set the instrument on a tripod or flat platform
50’ from an upright wall. Aim the front beam at the face of the
wall. Mark the point projected on the wall by front beam as ‘A’.
2. Turn the instrument clockwise (Fig. 2) to make the point
projected by the right laser beam on the same exact line as point
‘A’, and then mark the point as ‘B’.
3. Turn the instrument clockwise (Fig. 3) to make the point
projected by the left laser beam on the same exact line as point
‘A’, and then mark the point as ‘C’.
4. The vertical distance between points A, B and C should not
exceed 0.125” (3.2mm).
5. If laser exceeds 1/8” at 50’, contact Johnson Level & Tool for
service.
Fig. 1 Fig. 2 Fig. 3
6339H_Manuals 10/24/12 12:56 PM Page 22