DeWalt DW085LR Instructions Manual page 9

5. If the laser beams flash, the laser is not level (or plumb) and
should NOT BE USED for determining or marking level or
plumb. Try repositioning the laser on a level surface.
6.
If ANY of the following statements are TRUE, continue with
the instructions for Checking Laser Accuracy BEFORE
USING THE LASER for a project.
• This is the first time you are using the laser (in case the
laser was exposed to extreme temperatures).
• The laser has not been checked for accuracy in a while.
• The laser may have been dropped.
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.
Plumb Dot Accuracy
Checking the plumb calibration of the laser can be most
accurately done when there is a substantial amount of vertical
height available, ideally 25' (7.5 m), with one person on the floor
positioning the laser and another person near a ceiling to mark
the dot created by the beam on the ceiling.
1. Mark point P1 on the floor (Figure
2.
Turn the laser ON and press
ahead, and below the laser.
3. Place the laser so that the down dot is centered over point
P1 and mark the center of the up dot on the ceiling as point
P2 (Figure #1).
G
4. Turn the laser 180°, making sure that the down dot is still
centered on point P1 on the floor (Figure
#1).
G
once to display dots above,
#2).
G
5. Mark the center of the up dot on the ceiling as point P3
(Figure #2).
G
6.
Measure the distance between points P2 and P3.
7. If your measurement is greater than the Allowable
Distance Between P2 & P3 for the corresponding
Distance Between Ceiling & Floor in the following table,
the laser must be serviced at an authorized service center.
Distance Between
Ceiling & Floor
15' (4.5m)
20' (6m)
30' (9m)
40' (12m)
Level Dot Accuracy - Level
Checking the level calibration of the laser unit requires two
parallel walls at least 20' (6 m) apart.
1. Turn the laser ON and press
above, ahead, below, and to the right and left of the laser.
2. Place the laser 2"–3" (5–8 cm) from the first wall. To test the
front laser dot, make sure the front of the laser is facing the
wall (Figure #1).
H
3.
Mark the laser dot position on the first wall as point P1
(Figure #1).
H
4.
Turn the laser 180˚ and mark the laser dot position on the
second wall as point P2 (Figure
5. Place the laser 2"–3" (5–8 cm) from the second wall. To test
the front laser dot, make sure the front of the laser is facing
the wall (Figure #2), and adjust the height of the laser
H
until the laser dot hits point P2.
6. Turn the laser 180˚ and aim the laser dot near point P1 on
the first wall, and mark point P3 (Figure
7.
Measure the vertical distance between points P1 and P3 on
the first wall.
Allowable Distance
Between P2 & P3
7/64"(2.6mm)
9/64" (3.3mm)
7/32" (5.4mm)
9/32" (7.2mm)
twice to display dots
#1).
H
#2).
H
E
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