State Of Charge; Starting Operation; Switching On/Off; Operating Modes - Bosch GLL Professional Serie Manual Original

20 | English
To remove the batteries (12), press the re-
lease buttons (13) of the sealing cap (14) and
pull off the sealing cap. Make sure that the bat-
teries do not fall out. To do this, hold the meas-
uring tool with the battery bay (10) facing up-
ward. Remove the batteries. To remove the cover (11) from
inside the battery bay, reach into the cover and pull it out of
the measuring tool, applying light pressure to the side wall as
you do so.
Always replace all the batteries at the same time. Only use
batteries from the same manufacturer and which have the
same capacity.
Take the batteries out of the measuring tool when you
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are not using it for a prolonged period of time. The bat-
teries can corrode and self-discharge during prolonged
storage.
Battery Charge Indicator
The battery charge indicator (2) shows the state of charge of
the battery/batteries:
LED

State of charge

Green continuous light 100–75 %
Yellow continuous light 75–35 %
Red continuous light
35–10 %
No light – Battery defective
– Batteries drained
If the rechargeable battery or non-rechargeable batteries are
running low, the laser lines will gradually become dimmer.
Immediately replace a faulty rechargeable battery or any
empty batteries.
Operation

Starting Operation

Protect the measuring tool from moisture and direct
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sunlight.
Do not expose the measuring tool to any extreme tem-
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peratures or variations in temperature. For example,
do not leave it in a car for extended periods of time. In
case of large variations in temperature, allow the measur-
ing tool to adjust to the ambient temperature before put-
ting it into operation. The precision of the measuring tool
may be compromised if exposed to extreme temperat-
ures or variations in temperature.
Avoid substantial knocks to the measuring tool and
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avoid dropping it. Always carry out an accuracy check
before continuing work if the measuring tool has been
subjected to severe external influences (see "Accuracy
Check of the Measuring Tool", page 22).
Switch the measuring tool off when transporting it.
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The pendulum unit is locked when the tool is switched off,
as it can otherwise be damaged by big movements.
1 609 92A 4F2 | (06.06.2018)

Switching On/Off

To switch on the measuring tool, slide the on/off switch
(16) to the " On" position (for working without automatic
levelling) or to the " On" position (for working with auto-
matic levelling). As soon as it is switched on, the measuring
tool emits laser lines from the outlet apertures (1).
Do not direct the laser beam at persons or animals and
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do not stare into the laser beam yourself (even from a
distance).
To switch off the measuring tool, slide the on/off switch
(16) to the "Off" position. The pendulum unit is locked when
the tool is switched off.
Never leave the measuring tool unattended when
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switched on, and ensure the measuring tool is
switched off after use. Others may be blinded by the
laser beam.
If the maximum permitted operating temperature of 40 °C is
exceeded, the tool shuts down to protect the laser diode.
Once it has cooled down, the measuring tool is operational
again and can be switched back on.
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 Function
If no button on the measuring tool is pressed for approx.
120 min, the measuring tool will automatically switch itself
off to preserve battery life.
To switch the measuring tool back on after it has been auto-
matically switched off, you can either slide the on/off switch
(16) to the "Off" position first and then switch the measur-
ing tool back on, or press either the laser mode button (7) or
the receiver mode button (5) once.
To deactivate the automatic shut-off function, hold down the
laser mode button (7) for at least 3 s (with the measuring
tool switched on). If the automatic shut-off function is deac-
tivated, the laser beams will flash briefly as confirmation.
To activate the automatic shut-off function, switch the meas-
uring tool off and on again.
Deactivating the Signal Tone Function
The signal tone function is always activated once the meas-
uring tool is switched on.
To deactivate or activate the signal tone function, simultan-
eously press the laser mode button (7) and the receiver
mode button (5) and hold them down for at least 3 s.
Three short signal tones will sound as confirmation both
when the signal tone function is activated and deactivated.

Operating Modes

The measuring tool has several operating modes which you
can switch between 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 and two vertical laser
planes.
Bosch Power Tools