Placing the device in operation
Attaching the control panel
Push the control panel into the bracket at the right edge of the device.
Push the control panel carefully into the left bracket until it clicks into place.
Removing the control panel
Press the 
button 1to unlock the control panel.
The left side of the control panel detaches from the device and is secured by the bracket against falling out.
Move the control panel slightly to the left until it disengages from the right bracket.
Carefully remove the control panel from the left bracket.
Note:
The car sound system automatically switches off as soon as the control panel is removed.
Display language (only Hamburg 420 BT)
For the Hamburg 420 BT, you can define whether the language for messages on the display is Eng- lish or German. The setting is performed in the user menu (see the chapter "User settings", section "Mak- ing settings in the "DISPLAY" menu", menu item "LANGUAGE").
Setting the reception area
This car sound system is designed for operation in different regions with different frequency ranges and station technologies. The factory default of the reception area is "EUROPE". In addition, the reception areas "USA", "SOUTH AMERICA" and "THAILAND" are available.
Note:
If you operate the car sound system outside of Europe, you may first have to set a suitable re- ception area in the user menu (see the chapter "User settings", section "Making settings in the "TUNER" menu", menu item "TUNER AREA").
Switching on/off
Switching on/off with the On/Off button
For
To switch off the device, press and hold down the On/Off button 3 for longer than 2 sec- onds.
The car sound system switches off.
Note:
If you switch on the car sound system while the vehicle ignition is switched off, it auto- matically switches off after 1 hour to preserve the vehicle battery.
Switching on/off via vehicle ignition
The car sound system will switch off/on simulta- neously with the ignition if the device is correctly connected to the vehicle's ignition as shown in the installation instructions and you did not switch the device off by pressing the On/Off button 3.
Volume
Adjusting the volume
You can adjust the volume in steps from 0 (off ) to 50 (maximum).
Turn the volume control 4 to change the volume.
Note:
If a telephone or navigation system is con- nected with the car sound system as de- scribed in the installation instructions (pin 2 of chamber A), the car sound system is muted in case of a telephone call or naviga- tion announcement so that you can hear the playback of the telephone or navigation sys- tem undisturbed. During muting, the display shows "TELEPHONE".
Muting the car sound system (Mute)
Briefly press the On/Off button 3 to mute the car sound system or to reactivate the pre- vious volume.
While it is muted, the display shows "MUTE".
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