Johnson Level & Tool Mfg. 40-6690 User Manual

Page 18

• Accurately measure height from the center of the laser beam to

point A and point B, note it as A2 and B2.

• Calculate A2-A1, B2-B1. If |(A2-A1) - (B2-B1)| is less than or equal

to .118” or 3mm, the accuracy is good;

If the value of A2-A1 is larger than the value of B2-B1, the

laser beam is too high, and the user needs to adjust the
laser line to be leveled.

If the value of A2-A1 is smaller than the value of B2- B1,

the laser beam is too low, and the user needs to adjust
the laser line to be leveled.

Accuracy Calibration
• Press the power and enter buttons simultaneously, then release the

power button first. When the LCD shows “CALIBRATE...” release
the enter button then the laser will enter the calibration mode.
Sliding the cover down on the remote control, press the up and
down buttons on the remote, to control the laser beam movement
up or down. If the laser beam is too high, press the down button.
If the laser beam is too low, press the up button. Press the enter
button (on the remote control) to confirm the calibration.

• Recalibrate the laser until |(A2-A1) - (B2-B1)| is equal or less

than 3mm

• When |(A2-A1)-(B2-B1)| is greater than 6mm, you need to contact a

Johnson

authorized repair center.

4429H-English_Manuals 2/18/11 9:40 AM Page 18