-31-
This symbol will ap-
pear on the measuring
tool display if the Y-ax-
is has been success-
fully calibrated. “YOK” will appear on the dis-
play of the laser receiver.
Finish the calibration of the Y-axis with by
pressing the slope button (14).
This symbol confirms
that the X-axis and the
Y-axis have been suc-
cessfully calibrated
with the levelling accuracy selected at the be-
ginning. End the calibration with by press-
ing the slope button (14).
If the calibration has been completed suc-
cessfully, the measuring tool then automati-
cally switches itself off.
The relevant error message
will appear in the measur-
ing tool display if calibra-
tion of the X-axis or the
Y-axis has failed. “ERR”
will appear on the display
of the laser receiver.
Cancel the calibration with by pressing the
button for line operation (5). Check the posi-
tion of the tool VS receive before restart. Re-
start the calibration. If calibration fails again,
have the measuring tool checked by a Bosch
customer service agent.
Z-axis calibration (for GRL4000-80CHV only)
A free measuring distance on firm ground in
front of a 30 ft (10 m) wall is required for the
calibration. Fix a plumb line to the wall.
30 ft (10 m)
Position the measuring tool on a firm, level
surface. Switch the measuring tool on and
allow it to level in. Align the measuring tool
so that the laser beam is perpendicular to the
wall and cuts through the plumb line. Switch
the measuring tool off.
To start calibration mode, press and hold the
slope button (14) and then also briefly press
the on/off button (11). The measuring tool is
switched on. Allow the measuring tool to level
in.
Align the laser beam so that it
runs as parallel as possible to the
plumb line. Tilt the laser beam in
the ◀ direction by pressing the ▲
button (4). Tilt the laser beam in the ▶ direc-
tion by pressing the ▼ button (3).
If it is not possible to align the laser beam in
parallel to the plumb line, align the measuring
tool to the wall more precisely and start the
calibration process again.
If the laser beam is aligned in parallel, save
the calibration with by pressing the slope
button (14).
This symbol confirms that the Z-
axis has been calibrated success-
fully. At the same time, the status
indicator (12) will flash green
three times. End the calibration with by
pressing the slope button (14). The device
will shut down.
This error message will appear if
calibration of the Z-axis has been
unsuccessful. Cancel the calibra-
tion with by pressing the but-
ton for line operation (5).
Ensure that the reference vertical line is in
the pivoting range of the rotation head and
restart the calibration. Make sure that the la-
ser level is not moved during the calibration.
If the calibration is again unsuccessful, have
the laser level checked by a Bosch customer
service agent.
