Operation - Bosch GRL4000-90CHVG Operating/Safety Instructions Manual

u Protect the laser level and remote control
against moisture and direct sunlight.
u Do not expose the laser level or remote
control to any extreme temperatures or
variations in temperature. For example, do
not leave them in a car for extended peri-
ods of time. In case of large variations in
temperature, allow the laser level and the
remote control to adjust to the ambient
temperature before putting them into op-
eration. Before continuing work with the la-
ser level, always perform an accuracy check
(see "Accuracy Check of the Laser level",
page 27). The precision of the laser level
may be compromised if exposed to extreme
temperatures or fluctuations in tempera-
ture.
u Avoid substantial knocks to the laser level
and avoid dropping it. Always carry out an
accuracy check before continuing work if
the laser level has been subjected to severe
external influences (see "Accuracy Check of
the Laser level", page 27).
Starting Operation of the
remote control
The remote control will only work if it is fitted
with batteries that are sufficiently charged.
To activate the remote control, press any but-
ton on the remote control. The status of the
axes on the rotary laser is called up and dis-
played in the (34) and (35) status indicators
on the remote control.
Provided the status indicators are lit up, the
relevant setting on the rotary laser is changed
with every subsequent press of a button on
the remote control. The signal transmission
indicator (33) on the remote control lights up
to show that a signal is being transmitted.
In order to save energy, the remote control is
deactivated after a short time and the (34)
and (35) status indicators go out again.
It is not possible to switch the laser level on/
off with the remote control.
GRL4000-90CHVG 10-21.indd 19

Operation

Starting Operation of the
rotary laser
Setting up the laser level
u Keep the work area free from obstacles
that could reflect or obstruct the laser
beam. For example, cover any reflective or
shiny surfaces. Do not measure through
panes of glass or similar materials. The
measurements may be distorted by a re-
flected or obstructed laser beam.
Horizontal position
Position the laser level on a stable surface in
the horizontal or vertical position, mount it on
the tripod (44) or on the wall mount (45) with
the alignment unit.
Due to its high leveling accuracy, the laser
level is very sensitive to knocks and vibrations
and changes in position. Take care, therefore,
that the laser level is stable to avoid interrup-
tions to the operation caused by releveling.
Operating the laser level
The main functions of the laser level are con-
trolled by the buttons on the laser level and
the remote control (41). Additional functions
are available via the remote control (41), the
laser receiver (42), or by controlling remote-
ly via the Bosch Leveling Remote App (see
"Overview of control options for the func-
tions", page 34).
For the indicator on the laser level's display
(15), the following applies:
– The current settings for this function will be
indicated when a function button (e.g. the
line operation button (5)) is pressed for the
first time. The settings will be changed the
next time a function button is pressed.
– In the lower part of the display, softkey sym-
bols (i) are shown in various menus. The
corresponding function keys (softkeys)
arranged around the display can be used
to execute the functions represented by
the symbols (i) (see figure B). Depending
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Vertical position
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