GF82.64-P-3112FAA CD Player With Changer Component Description

GF82.64-P-3112FAA CD Player With Changer Component Description

MODEL 203.7
- with CODE (819) 6-disk CD changer
MODEL 203.7 as of model year 09/Modification Year 08 model refinement package







A2/6 CD player with changer (in glove compartment)

Location
The CD player with changer is located in the upper section of the glove compartment.

Task
- Playing audio CDs (MP3 compatible)
- Changing CDs contained in the magazine

The CD player with changer reads in the following signals for this purpose over direct lines:
- Circuit 30
- Circuit 31
- Wake-up

The CD player with changer receives operating and control signals from each audio unit over the Media Oriented System Transport (MOST):
- Radio (A2), with code (523) MB Audio 20 radio
- Radio and navigation unit (A2/56), with code (525) MB Audio 50 APS radio
- COMAND operating, display and controller unit (A40/3), with code (527) COMAND APS with single DVD drive (with navigation)

The CD player with changer reads in the audio signals of each medium and forwards them over the MOST to one of the following control units:
- Audio equipment, except code (810) Sound system
- Amplifier for sound system (N40/3), with code (810) Sound system

For this purpose, the CD player with changer generates messages on various operating states and forwards them over MOST to the audio equipment. The following operating states belong to the CD player with changer:
- No magazine in CD changer
- Magazine occupation (audio CDs only)
- Number of current CD
- Number of current title
- List of occupied insertion slots
- Number of titles per CD
- Current operating state (playback, pause, etc.)

Design
- 6-disk CD changer magazine
- Interface to MOST
- Diagnostic trouble code memory

Function
The audio data is stored digitally on the CD. The audio CD in the CD player with changer is driven by a motor. The laser optics scan the side of the rotating CD with the audio data written onto it, without touching it, and convert the digital optical signals into electric signals. Small interruptions to the data flow of the laser optics, caused by scratches or contamination on the audio CD, are subsequently interpolated and thus compensated for.

The electrical signals are then decoded in the CD player with changer and forwarded over MOST to each audio unit (except code (810) Sound system) or on the sound system amplifier (N40/3) (with code (810) Sound system).

The CD player with changer can play conventional audio CDs as well as audio CDs in MP3 format. While doing so, a conventional audio CD is emulated (simulated).