CD-player mode, function - GF82.60-P-2002R

MODELS 203.0 /2 /7 up to 23.4.04 with CODE (352a) COMAND operating and display system with CODE (491) U.S. version

Fig 1: Block Diagram For Command With Code (819A) CD Changer

Block diagram for COMAND with code (819a) CD changer

Operation of CD changer for code (819a) CD changer

The CD player with changer (in the glove compartment) (A2/6) is controlled by the COMAND operating, display and control unit (A40/3). The control signals and the audio data from the CD player with changer (in glove compartment) (A2/6) are transmitted by the Digital Data Bus (D2B).

Only 12-cm CDs may be inserted into the CD player with changer (in glove compartment) (A2/6); no 8-cm CD adapters may be used.

On vehicles with code (810) sound system, the sound amplifier (A2/13) is responsible for final amplification of the audio signals. The signals between the COMAND operating, display and control unit (A40/3) and the sound amplifier (A2/13) are transmitted digitally via the Digital Data Bus (D2B). The amplified signals are emitted via the vehicle's loudspeaker system.

The COMAND operating, display and control unit (A40/3) provides, in conjunction with the CD player with changer (in glove compartment) (A2/6), the following functions:

"Scan" function
The track of a CD, or each first track on a CD in the magazine is played for t = 8 s. After a complete run through, the scan function is automatically terminated.
"Random" function
All titles on a CD or the entire CD magazine are played according to a random principle.
"Repeat" function
Alternatively, a track, a CD or the entire CD magazine is repeated.
Fast forward/reverse (music search)
The music played during fast forwarding/reverse is audible. Certain parts of a track can therefore be specifically played or skipped.

If the vehicle is equipped with the sound amplifier (A2/13), the COMAND operating, display and control unit (A40/3) must be coded accordingly with the aid of STAR DIAGNOSIS. Otherwise, faults occur during reproduction of audio signals.

CD title allocation, function

Each CD includes a permanently stored so-called table of contents (TOC entry). As a result, the COMAND operating, display and control unit (A40/3) uses this TOC to clearly recognize a particular CD, and is able to automatically name it after the one-time user allocation of the track (even if the CD is subsequently inserted in another CD magazine).

The table of contents (TOC entry) also contains information regarding the number of tracks on a CD and the CD's total playing time.

CD operation with the integrated multi-standard drive

The COMAND operating, display and control unit (A40/3) has an integrated multi-standard disk drive which is used alternately for loading the navigation data or for playing back audio CDs (audio CDs cannot be played in navigation mode).

Operating, display and control unit, location/task/design/function		GF82.85-P-3114R
CD player with changer, location/task/design/function	With code (819a) CD changer	GF82.64-P-3113R
Volume/tone adjustments, function		GF82.60-P-2003R
Data transfer between COMAND and instrument cluster, function		GF82.85-P-3008R