Craftsman CMHT77630, Instructions Manual

11

E

Checking Laser Accuracy

The laser tools are sealed and calibrated at the factory. 
It is recommended that you perform an accuracy check

prior to using the laser for the first time 

(in case the 

laser was exposed to extreme temperatures) and then 
regularly to ensure the accuracy of your work.

 When 

performing any of the accuracy checks listed in this 

manual, follow these guidelines:

• Use the largest area/distance possible, closest to the 

operating distance. The greater the area/distance, the 
easier to measure the accuracy of the laser.

• Place the laser on a smooth, flat, stable surface that 

is level in both directions.

• Mark the center of the laser beam.

Horizontal Beam - Scan Direction

Checking the horizontal scan calibration of the laser 
requires two walls at least 30’ (9m) apart. It is important 
to conduct a calibration check using a distance no 
shorter than the distance of the applications for which 
the tool will be used.

1.

Place the back of the laser against a wall and facing 
straight ahead toward the opposing wall (Figure 

D

1

). 

2.

Move the Power/Transport Lock switch to the right 
(Figure 

A

3

) to turn the laser ON in self-leveling 

mode and display the horizontal and vertical beams. 

3.

Turn the laser 45º counter-clockwise so that the 
right-most end of the laser line is displayed on the 
wall.

4.

Mark 

a

 on the center of the beam on the wall.

5.

Turn the laser 90º clockwise so that the left-most 
end of the laser line is displayed near 

a

 (Figure 

D

2

).

6.

Mark 

b

 on the center of the beam on the wall.

7.

Measure the vertical distance between 

a

 and 

b

.

8.

If your measurement is greater than the 

Allowable 

Distance Between 

a

 and 

b

 for the corresponding 

Distance Between Walls

 in the following table, the 

laser must be serviced at an authorized service 
center.

Distance 

Between Walls

Allowable Distance

Between 

a

 and 

b

30’ (9m)

15/32” (12mm)

40’ (12m)

9/16” (14.4mm)

50’ (15m)

23/32” (18mm)

Horizontal Beam - Pitch Direction

Checking the horizontal pitch calibration of the 
laser requires a single wall at least 30’ (9m) long. 
It is important to conduct a calibration check using 
a distance no shorter than the distance of the 
applications for which the tool will be used.

1.

Place the laser against the end of the wall (Figure 

E

1

).

2.

Move the Power/Transport Lock switch to the right 
(Figure 

A

3

) to turn the laser ON in self-leveling 

mode and display the horizontal and vertical beams. 

3.

At least 30’ (9m) apart along the laser beam, mark 

a

 and 

b

.

4.

Move the laser to the opposite end of the wall  
(Figure 

E

2

).

5.

Position the laser toward the first end of the same 
wall and parallel to the adjacent wall.

6.

Adjust the height of the laser so the center of the 
beam is aligned with 

b

.

7.

Directly above or below 

a

, mark 

c

 along the laser 

beam (Figure 

E

3

).

8.

Measure the distance between 

a

 and 

c

.