Initial Operation; Direction Indicators - Bosch LR20 Operating/Safety Instructions Manual

Initial Operation

• Protect the laser receiver against moisture
and direct sunlight.
• Do not subject the laser receiver to extreme
temperatures or variations in temperature.
As an example do not leave it in vehicles for
a long time. In case of large variations in tem-
perature, allow the laser receiver to adjust
to the ambient temperature before putting it
into operation. In case of extreme tempera-
tures or variations in temperature, the accu-
racy of the laser receiver can be impaired.
Setting up the Laser Receiver
Position the laser receiver at least 20 inches
away from the rotational laser.
Position the laser receiver in such a manner
that the laser beam can reach the reception
area 6. Align the laser receiver in such a man-
ner that the laser beam runs laterally through
the reception area (as shown on the Figure A).
Switching On and Off
• A loud audio signal sounds when switching
on the tool. Therefore, keep the tool away
from your ear or other people when switch-
ing on. The loud audio signal can cause hear-
ing defects.
To switch the laser receiver On, press the On/
Off button 3. All display indicators light up
briefly and an audio signal sounds.
Every time when the laser receiver is switched
on, both volume and accuracy settings are
restored from the last setting before the re-
ceiver was switched off.
To switch the laser receiver Off, press and
hold On/Off button 3. All display indicators
light up briefly before the receiver switches
off, and an audio signal sounds.
If no buttons on the laser receiver are pressed
and no laser beam reaches the reception
area 6, for approx. 30 mins, the laser receiver
switches off automatically to save energy.
Selecting the Measurement Unit
The distance between the laser beam and the
center mark is shown on the display in [mm]
or [in:decimals/fractions].
The default setting in delivery condition is
[in: fractions].
LR20 Operation
To change the setting simultaneously press
the audio level button 4 and the button 2 for
selecting the accuracy until the desired set-
ting is reached.
The selected measurement unit is saved when
the laser receiver is turned off.
Selecting the Accuracy Setting
With button 2, you can specify with which ac-
curacy the position of the laser beam is indi-
cated on the reception area:
– "Fine" adjustment (indication 27 on the
display),
– "Medium" adjustment (indication 26 on
the display).
– "Coarse" adjustment (indication 25 on
the display).
Every time when the laser receiver is switched
on the last accuracy setting is restored.
The position of the laser beam on the recep-
tion area 6 is indicated:
– by the direction indicators "move down-
ward" 22, "move upward" 24 or center 23
on the display 7 on the front of the laser
receiver and display 12 at the back of the
laser receiver,
– optionally by the audio signal (see "Audio
Signal for Indication of the Laser Beam")
Laser receiver too low: If the laser beam runs
through the upper half of the reception area 6,
the direction indicator 24 on the display will
light up and offset display segments 20/21
will also light up depending on the selected
unit of measurement. If the audio signal is
switched on, laser receiver shows slow beep-
ing sound. Move the laser receiver upwards in
the arrow direction.
If the laser beam is more than 30mm (1.18
inches) above the center mark of the receiver,
only the direction indicator 24 on the display
will light up. If the audio signal is switched
on, laser receiver shows slow beeping sound.
Move the laser receiver upwards in the arrow
direction. If the laser reception is interrupted
due to a physical obstruction, the direction in-
dicator 24 will flash for 3 seconds to indicate
the last position of the laser beam.
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Direction Indicators