DeWalt DW078 Instruction Manual page 19

or not the laser is providing a correct level line. These checks
cannot take the place of professional calibration performed by a
D WALT service center.
E
LEVEL CALIBRATION CHECK (X-AXIS)
1. Set up a tripod between two walls that are at least 50 feet
(15.3 m) apart. The exact location of the tripod is not critical.
2. Mount the laser unit on the tripod so that the X-axis points
directly toward one of the walls.
3. Turn the laser unit on and allow it to self-level.
4. Mark and measure points A and B on the walls as shown in
Figure 16.
FIG. 16
BEAM
A
L
5. Turn the entire laser unit 180º so the X-axis points directly
toward the opposite wall.
6. Allow the laser unit to self-level, and mark and measure points
AA and BB on the walls as shown in Figure 17.
7. Calculate the total error using the equation:
Total Error = (AA – A) – (BB– B)
FIG. 17
LASER UNIT ROTATED 180˚
AA
8. Compare total error to the allowable limits shown in the following
table.
Distance between walls
L = 50 ft. (15.3 m)
B
L = 75 ft. (22.9 m)
L = 100 ft. (30.5 m)
LEVEL CALIBRATION CHECK (Y-AXIS)
Repeat the procedure above, but with the laser unit positioned so
the Y-axis is pointed directly toward the walls.
Repairs
The charger is not serviceable. There are no serviceable parts
inside the charger.
To assure product SAFETY and RELIABILITY, repairs, maintenance
and adjustments should be performed by a D
center, a D WALT authorized service center or other qualified
E
service personnel. Always use identical replacement parts.
17
BEAM
L
Allowable Error
1/8" (3 mm)
3/16" (4.5 mm)
1/4" (6 mm)
WALT factory service
E
BB