ML 320 (163.154) V6-3.2L (112.942) (1998)
CD Changer: Description and Operation
GF82.64-P-3113-02GH CD Player With Changer, Function
GF82.64-P-3113-02GH CD Player With Changer, Function
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with CODE (352a) COMAND operating and display system
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with CODE (819) 6-disk CD changer in trunk
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except CODE (491) U.S. version
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except CODE (498) Japanese version
Controlling CD player
The CD player with changer (in trunk) (A2/6) is controlled via the digital databus (D2B) and an electric wake-up line, dependent upon the vehicle
equipment specification
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from the radio (A2) or
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from the COMAND operating, display and control module (A40/3)
The CD player with changer (A2/6) generates messages for the following operating states:
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No magazine in CD changer
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Magazine assignment (only with music CD)
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Number of current CD
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Number of current title
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List of occupied slots (CDs)
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title number per disc
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Current operating state (acoustic reproduction of radio signals, pause, etc.)
Messages are sent to the digital databus ( D2B) and interpreted by the radio (A2) or the COMAND operating, display and control module (A40/3) .
Control possibilities for the CD player with changer (in the trunk) (A2/6) using the COMAND operating, display and control unit (A40/3).
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CD selection via rotary control or keyboard input
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Track skipping via rocker or numeric keypad
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Forward and backward
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Track search to next or previous track
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Scan function
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Random and repeat functions for the complete CD magazine
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Repeat function for repeating track or repeating CD
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Allocation of CD names
CD playback
The audio data is digitally stored on the CD. In the CD player the audio CD is driven by a motor. The laser-optical device scans the side of the rotating
CD with no label without touching it and converts the digital-optical signals into electric signals.
Small interruptions, caused by scratches or contamination on the audio CD, are interpolated subsequently by the D/A converter and thus compensated.
The electric signals are subsequently decoded in the CD player with changer (in trunk) (A2/6) and sent via the digital databus (D2B), depending upon the
vehicle's equipment specification, to the COMAND operating, display and control module (A40/3) or the radio (A2) over the audio signal processor to
the loudspeaker, or if the sound amplifier (A2/13) (code 810) is installed, to the loudspeakers.
Jumps and interruptions during playback
On poor roads and where vibrations are violent steps and interruptions may happen during playback. In such cases CD mode should be put on hold until
the condition of the road improves.
In the wet or where ambient temperatures fluctuate wildly the CD changer housing may experience a build up in its humidity level condensation
formation).
This can also lead to playback faults. In such cases, care should be taken to ensure that the CD player and the trunk are sufficiently vented.