CD player with changer, function - GF82.64-P-3113-02BA

CD player control 

The CD player with changer (in the trunk) (A2/6) is controlled by the following components via the Media Oriented System Transport (MOST) according to the vehicle equipment:

• Radio (A2)
• COMAND operating, display and control unit (A40/3)

The CD player outputs messages under the following operating conditions:

• No magazine in CD changer
• Magazine occupation (audio CDs only)
• Number of current CD
• Number of current title
• List of occupied CD places
• Number of titles per CD
• Current operating state (acoustic reproduction of radio signals, pause, etc.)

The messages are sent to the Media Oriented System Transport (MOST) and interpreted by the radio (A2) or COMAND operating, display and control unit (A40/3).

CD playback 

The audio data is stored digitally on the CD. The audio CD is driven by a motor in the CD player with changer (in the trunk) (A2/6). The laser-optical device scans the side of the rotating CD with no label without touching and converts the digital optical signals into electric signals. Small interruptions to the data flow to the laser optics, caused by scratches or contamination on the audio CD, are subsequently interpolated by the DA converter and thus compensated for. The electric signals in the CD changer are then decoded and transmitted via the Media Oriented System Transport (MOST) depending upon the vehicle's equipment specification, to the COMAND operating, display and control unit (A40/3n1), the radio (A2) or the sound amplifier (A2/13).

Jumps and interruptions during playback 

When driving on poor roads and during hefty vibrations it may be that jumps and interruptions occur during playback. In such cases, CD operation must wait until the road conditions improve. In wet weather or large fluctuations in the ambient temperature moisture can accumulate in the housing of the CD player with changer (in the trunk) (A2/6) (condensation formation). This may also lead to faults occurring during playback. In such cases it must be ensured that there is sufficient ventilation of the CD player with changer (in the trunk) (A2/6) and of the trunk itself.

Changing the magazine 

The magazine can be accessed using a sliding flap. The user must slide back the flap and press the eject button to remove the magazine. The magazine is always ejected when the eject button is pressed independent of the operating status of the CD changer. This function is available as soon as Circuit 30 is ON.