
English | 11
Bosch Power Tools 1 609 92A 43E | (31.7.17)
Operation
Initial Operation
Protect the measuring tool against moisture and direct
sun light.
Do not subject the measuring tool to extreme tempera-
tures or variations in temperature. As an example, do
not leave it in vehicles for a long time. In case of large vari-
ations in temperature, allow the measuring tool to adjust to
the ambient temperature before putting it into operation.
In case of extreme temperatures or variations in tempera-
ture, the accuracy of the measuring tool can be impaired.
Avoid heavy impact to or falling down of the measuring
tool. After severe exterior effects to the measuring tool, it
is recommended to carry out an accuracy check (see
“Accuracy Check of the Measuring Tool”, page 12) each
time before continuing to work.
Switch the measuring tool off during transport. When
switching off, the levelling unit is locked. Else it can be
damaged in case of intense movement.
Switching On and Off
To switch on the measuring tool, slide the On/Off switch 15
to the “On”position (when working without automatic
levelling) or to the “On”position (when working with
automatic levelling). Immediately after switching on, the
measuring tool sends laser beams out of the exit openings 1.
Do not point the laser beam at persons or animals and
do not look into the laser beam yourself, not even from
a large distance.
To switch off the measuring tool, slide the On/Off switch 15
to the “Off” position. When switching off, the levelling unit is
locked.
Do not leave the switched-on measuring tool unattend-
ed and switch the measuring tool off after use. Other
persons could be blinded by the laser beam.
When exceeding the maximum permitted operating tempera-
ture of 40 °C, the measuring tool switches off to protect the
laser diode. After cooling down, the measuring tool is ready
for operation and can be switched on again.
If the temperature of the measuring tool is approaching the
maximum permissible operating temperature, the laser lines
will gradually become dimmer.
Deactivating the Automatic Shut-off
When no button on the measuring tool is pressed for approx.
120 minutes, the measuring tool automatically switches off
to save the batteries.
To switch the measuring tool back on after automatic shut-off,
you can either slide the On/Off switch 15 to the “Off” position
first and then switch the measuring tool back on, or press
either the laser mode button 6or the receiver mode button 4
once.
To deactivate the automatic shut-off function, hold down the
laser mode button 6for at least 3 s (with the measuring tool
switched on). If the automatic shut-off function is deactivat-
ed, the laser beams will flash briefly as confirmation.
To activate the automatic shut-off, switch the measuring tool
off and then on again.
Deactivating the Signal Tone
After the measuring tool has been switched on, the audio
signal is always activated.
To deactivate or activate the audio signal, simultaneously
press the laser mode button 6and the receiver mode button
4and hold them down for at least 3 s.
The audio signal activation and deactivation are both con-
firmed by three short beeps.
Operating Modes
The measuring tool has several operating modes between
which you can switch at any time. These are for:
– Generating a horizontal laser plane,
– Generating a vertical laser plane,
– Generating two vertical laser planes,
– Generating a horizontal laser plane as well as two vertical
laser planes.
After you switch it on, the measuring tool generates a horizon-
tal laser plane. To change the operating mode, press the laser
mode button 6.
All operating modes can be selected both with and without
automatic levelling.
Receiver mode
Receiver mode must be activated to work with the laser re-
ceiver 25 – regardless of which operating mode is selected.
In receiver mode the laser lines flash at very high frequency,
enabling them to be detected by the laser receiver 25.
To switch on receiver mode, press button 4. Indicator 5will
light up green.
When receiver mode is switched on, the laser lines are less
visible to the human eye. For this reason, switch receiver
mode off by pressing button 4again to work without a laser
receiver. Indicator 5will extinguish.
Automatic Levelling
Working with Automatic Levelling
Position the measuring tool on a level and firm support, attach
it to the holder 23 or to the tripod 29.
When working with automatic levelling, push the On/Off
switch 15 to the “ On”position.
After switching on, the levelling function automatically com-
pensates irregularities within the self-levelling range of ±4°.
The levelling is finished as soon as the laser beams do not
move any more.
If automatic levelling is not possible, e.g. because the surface
on which the measuring tool stands deviates by more than 4°
from the horizontal plane, the laser lines begin to flash rapid-
ly. When the audio signal is activated, a fast-beat signal
sounds.
Set up the measuring tool in level position and wait for the
self-levelling to take place. As soon as the measuring tool is
within the self-levelling range of ±4°, all laser beams light up
continuously and the audio signal is switched off.
OBJ_BUCH-3304-001.book Page 11 Monday, July 31, 2017 1:09 PM