Bosch GRL 400 H Professional - Manual (Page 19)

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Bosch Power Tools 1 619 929 J22 | (27.6.11)
charger to the mains supply. Charging the empty battery pack
takes approx. 14 h. The battery charger and the battery pack
are protected against overcharging.
A battery that is new or has not been used for a longer period
does not develop its full capacity until after approx. 5 charg-
ing/discharging cycles.
Do not charge the battery pack 7 each time after using, other-
wise its capacity will be reduced. Charge the battery pack on-
ly when the charge-control indicator 6 flashes or lights up
continuously.
A considerably reduced operating period after charging indi-
cates that the battery pack is used up and must be replaced.
If the battery pack is empty, the measuring tool can also be
operated off of the battery charger 15 when connected to a
power supply. Switch the measuring tool off, charge the bat-
tery pack for approx. 10 min and then switch the measuring
tool on again with the battery charger connected.
To change the battery pack 7, turn the locking knob 10 to
position and pull out the battery pack 7.
Insert a new battery pack and turn the locking knob 10 to the
position.
f Remove the battery pack from the measuring tool
when not using it for longer periods. When storing for
longer periods, the rechargeable batteries can corrode
and discharge themselves.
Charge-control Indicator
When the charge-control indicator 6 flashes red for the first
time, the measuring tool can still be operated for approx. 2 h.
When the charge-control indicator 6 lights up red continuous-
ly, measurements are no longer possible. The measuring tool
switches off automatically after 1 minute.
Power Supply of the Laser Receiver
Alkali-manganese batteries are recommended for the laser
receiver.
Press the latch 18 of the battery lid outward and open the bat-
tery lid 28.
When inserting the battery, pay attention to the correct polar-
ity according to the representation on the inside of the battery
compartment.
When the battery low indicator b appears for the first time on
the display 25, the laser receiver can still be operated for ap-
prox. 3 h.
f
Remove the battery from the laser receiver when not
using it for longer periods. When storing for longer peri-
ods, the battery can corrode and discharge itself.
Operation
Starting Operation of the Rotational Laser Level
f Protect the measuring tool against moisture and direct
sun light.
f Do not subject the measuring tool to extreme tempera-
tures or variations in temperature. As an example, do not
leave it in vehicles for longer periods. In case of large varia-
tions 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 temperature,
the accuracy of the measuring tool can be impaired.
f Avoid heavy impact to or dropping down of the measur-
ing tool. After severe exterior effects to the measuring
tool, it is recommended to carry out an accuracy check
(see “Levelling Accuracy of the Rotational Laser Level”,
page 21) each time before continuing to work.
Setting Up the Measuring Tool
Position the measuring tool on a firm sur-
face or mount it to a tripod 30.
Due to the high levelling accuracy, the
measuring tool reacts sensitively to ground
vibrations and position changes. Therefore,
pay attention that the position of the meas-
uring tool is stable in order to avoid opera-
tional interruptions due to re-levelling.
Switching On and Off
f
Do not direct the laser beam at persons or animals (es-
pecially not at their eye level), and do not stare into the
laser beam yourself (not even from a distance.) Imme-
diately after switching on, the measuring tool sends out the
variable laser beam 4.
For switching on the measuring tool, briefly press the On/Off
button 2. The indicators 3, 1 and 6 light up briefly. The meas-
uring tool immediately starts the automatic levelling. During
the levelling, the levelling indicator 1 flashes green, the laser
does not rotate and flashes.
The measuring tool is levelled in as soon as levelling indicator
1 lights up green continuously and the laser beam is steady.
After the levelling is completed, the measuring tool automati-
cally starts in rotational operation.
The measuring tool exclusively operates with fixed rotational
speed in rotational operation, which is also suitable for use of
a laser receiver.
When factory set, the shock-warning function is automatically
switched on, and the shock-warning indicator 3 lights up green.
To switch off the measuring tool, briefly press the On/Off
button 2. When the shock warning has actuated (shock-warn-
ing indicator 3 flashes red), briefly press the On/Off button
once to restart the shock-warning function, and then again to
switch off the measuring tool.
f
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.
To save the batteries, the measuring tool is automatically
switched off when not within the self-levelling range for more
than 2 h or when the shock warning is actuated for more than
2 h (see “Automatic Levelling of the Rotational Laser Level”,
page 20). Reposition the measuring tool and switch it on again.
Starting Operation of the Laser Receiver
f Protect the laser receiver against moisture and direct
sun light.
OBJ_DOKU-20994-002.fm Page 19 Monday, June 27, 2011 12:55 PM