Manual Bosch GLL 3-50 Professional (page 14 of 245) (English, German, Dutch, Danish, French, Italian, Polish, Portuguese, Swedish, Turkish, Spanish, Norwegian, Finnish)

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14 | English

1 609 92A 0KM | (19.11.14) Bosch Power Tools

23 Laser viewing glasses*

24 Universal holder BM 1*

25 Telescopic rod BT 350*

26 Measuring plate with stand*

27 Laser receiver*

28 Holder*

29 Case*

* The accessories illustrated or described are not included as

standard delivery.

Assembly

Inserting/Replacing the Batteries

Alkali-manganese batteries are recommended for the meas-

uring tool.

To open the battery lid 8, pull latch 10 and fold the battery lid

out. Insert the batteries. When inserting, pay attention to the

correct polarity according to the representation on the out-

side of the battery lid.

When the battery indication 5 flashes red, the batteries must

be replaced.

Always replace all batteries at the same time. Only use batter-

ies from one brand and with the identical capacity.

 Remove the batteries from the measuring tool when

not using it for extended periods. When storing for ex-

tended periods, the batteries can corrode and self-dis-

charge.

Using the Rotating Platform

Place the measuring tool with the

guide groove 15 on the guide rail 16

of the rotating platform 19 and slide

the measuring tool to the stop onto

the platform. To disconnect, pull the

measuring tool in the opposite direc-

tion from the rotating platform.

Extending the Telescopic Legs

Unscrew the locking screw

17 for the extendable

stand. Pull out the stand.

Lock the stand by tightening

the locking screw 17. Re-

peat the process for the oth-

er two stands.

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 or falling of the measuring tool. Af-

ter heavy exterior impact on the measuring tool, an accura-

cy check should always be carried out before continuing to

work (see “Levelling Accuracy”).

 Switch the measuring tool off during transport. When

switching off, the levelling unit, which can be damaged in

case of intense movement, is locked.

Switching On and Off

To switch on the measuring tool, slide the On/Off switch 14

to the “on” position (when working without automatic lev-

elling) or to the “on” position (when working with auto-

matic levelling). Immediately after switching on, the measur-

ing 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 14

to the “off” position. When switching off, the levelling unit is

locked.

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.

Deactivating the Automatic Shut-off

The measuring tool switches off automatically after an operat-

ing duration of 30 minutes. To deactivate the automatic

switch-off, keep the operating mode button 4 pressed for 3 s

while switching on the measuring tool. When the automatic

switch-off is deactivated, the laser lines briefly flash after 3 s.

 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 activate the automatic shut-off, switch the measuring tool

off and then on again (without the operating mode button 4

pushed).

Operation Modes (see figures A–D)

The measuring tool has four operating modes, between which

you can switch at any time:

– Horizontal operation (operating mode A): generates a

horizontal laser line

– Cross-line operation (operating mode B): generates a

horizontal and a vertical laser line

OBJ_BUCH-1973-003.book Page 14 Wednesday, November 19, 2014 8:19 AM

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Bosch GLL 3-50 Professional Manual

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