Bosch GML 20 Professional Original Instructions Manual page 8

OBJ_BUCH-1875-002.book Page 8 Monday, November 16, 2015 3:07 PM
8 | English
 Observe the mains voltage! For power supply via mains,
the voltage of the power source must correspond with the
data on the type plate of the construction site radio. Con-
struction site radios marked with 230 V can also be oper-
ated with 220 V.
Battery Insertion/Removal (see figure A)
 Use only original Bosch Professional 14.4 V and 18 V
lithium ion batteries. Using other batteries can lead to
injuries and pose a fire hazard.
Note: Use of batteries not suitable for the construction site
radio can lead to malfunctions of or cause damage to the con-
struction site radio.
Disengage locking latch 12 of the battery lid ("Battery Bay")
and fold out the battery lid 13.
Insert a battery into the battery port 11 in such a manner that
the connections of the battery face against the connections in
the charging compartment 11, and allow the battery to en-
gage in the battery port.
As soon as a battery is inserted, the indication l appears on
the display. The indicator flashes when the battery is low.
When the battery is too warm or too cold for operation, the
temperature warning indicator k on the display lights up. Wait
until the battery has reached the allowable temperature range
before putting the construction site radio into operation.
To remove the battery 14, press the release button on the
battery and pull it out of the battery port 11.
After inserting or removing the battery, close the battery lid
13. Lock the battery lid by engaging the locking latch 12 in the
housing and then pressing down.
Battery Charging
 Use only the battery chargers listed on the accessories
page. Only these battery chargers are matched to the lith-
ium ion batteries used in your construction site radio.
Note: The battery is supplied partially charged. To ensure full
capacity of the battery, completely charge the battery in the
battery charger before using your power tool for the first time.
The lithium ion battery can be charged at any time without
reducing its service life. Interrupting the charging procedure
does not damage the battery.
The battery is equipped with a NTC temperature control
which allows charging only within a temperature range of
between 0 °C and 45 °C. A long battery service life is
achieved in this manner.
Inserting/Replacing the Back-up Battery
(see figure A)
In order to store the time in the construction site radio, back-
up batteries have to be inserted. Using alkali-manganese bat-
teries is recommended for this purpose.
Disengage locking latch 12 of the battery lid ("Battery Bay")
and fold out the battery lid 13.
Remove the battery 14, if required.
To open the back-up battery lid 7, press on the latch 6 and
remove the back-up battery lid. Insert the back-up batteries.
When inserting, pay attention to the correct polarity accord-
1 609 92A 1U1 | (16.11.15)
ing to the representation on the inside of the back-up battery
compartment.
Mount the back-up battery lid 7 again.
"REPLACE AA BATTERY WHEN UNIT NO LONGER KEEPS
CORRECT TIME": Replace the back-up batteries when the
construction site radio no longer stores the time.
Always replace all batteries at the same time. Only use bat-
teries from one brand and with the identical capacity.
 Remove the back-up batteries from the construction
site radio when not using it for longer periods. When
storing for longer periods, the back-up batteries can cor-
rode and discharge themselves.
Operation
 Protect the construction site radio against moisture
and direct sunlight.
Audio Operation (see figures B and C)
Switching Audio Operation On/Off
To switch on audio operation (radio and external playback
devices), press the On/Off button 26. The display 27 goes on
and the last set audio source after switching off is activated.
When the construction site radio is in the energy saving mode
(see "Energy Saving Mode", Page 11), press the On/Off but-
ton 26 twice to switch on audio operation.
To switch off audio operation, press the On/Off button 26
again. The current audio source setting is stored.
Adjusting the Volume
To increase the volume, turn the "Volume" 25 adjustment
knob clockwise; to reduce the volume, turn the adjustment
knob anticlockwise. The volume setting (value between 0 and
20) appears for a few seconds in indicator d on the display.
Before adjusting or changing a radio station, set the volume to
a lower setting; before starting an external audio source, set
the volume to medium.
Adjusting the Sound
An equalizer is integrated in the construction site radio for op-
timal sound reproduction.
The treble and bass setting can be manually changed or sound
pre-sets for various music styles can be used. The following
pre-programmed settings are available: "JAZZ", "ROCK",
"POP" and "CLASSICAL" apart from the individually pro-
grammable setting "CUSTOM".
To select one of the stored sound pre-sets, press the "Equal-
izer" button 15 until the desired setting is indicated in indica-
tor a on the display.
Changing the "CUSTOM" Setting:
– Press the "Custom" button 17 once. The "BAS" indicator
c flashes on the display and the stored bass level flashes in
indicator d.
– Set the desired bass level (value between 0 and 10). To in-
crease the bass level, turn the "Bass/Treb" adjustment
knob 25 clockwise; to reduce the bass level, turn the ad-
justment knob anticlockwise.
Bosch Power Tools