CD-player mode, function

P82.60-4770-09

Block diagram for radio A2
Overall system, shown with MB Audio 20 radio (Code 523) with CD disk drive, CD changer, (Code 819) and "Portable CTEL" UPCI telephone system (Code 388)

1 Vehicle loudspeakers

2 Rear window antennas

A1 Instrument cluster

A2 Radio

A2/6 CD changer

A2/49a1 Telephone antenna

Abbreviations

AM AM frequency bands

FM FM frequency bands

CAN-B Control Area Network bus class B (interior)

CAN-C Controller Area Network bus Class C (engine compartment)

MFL Multifunction steering wheel

MOST Media Oriented System Transport

A2/64 Left antenna amplifier module

A28/3 E-net compensator

A34/6 Portable CTEL

A34/15 Universal Portable CTEL Interface (UPCI) portable CTEL holder

A67b/1 Hands-free system microphone group

N80 Steering column module

N93 Central gateway control unit

N123/1 Universal Portable CTEL Interface (UPCI [UHI]) control unit

CD player mode

Audio CDs can be played back using the CD changer (A2/6), which is located in the slot of the center console under the radio (A2).In addition to this, the audio system also has a single CD disk drive in the radio with which audio CDs can be played.

The system is operated using the keyboard on the radio or using the left multifunction steering wheel button group (S110) or right multifunction steering wheel button group (S111).

The radio control signals and the audio data of the CD changer are transmitted via the MOST bus (Media Oriented Systems Transport).

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Signal preparation and amplification is performed by the radio.
CD player mode is triggered at the operating unit by pressing the CD main function key.

 Only 12-cm CDs may be played in the CD changer

8 cm CD adapters must not be used. Up to 6 CDs can be loaded.

 If a CD has not been changed, the last CD played is automatically loaded again.

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After placing an audio CD into the automatically retracting tray of the CD-changer, the following functions are available to the user:

 Selection of CD recess in changer and loading CD

 CD selection

 Track selection

 Forwards/backwards search

 Current playtime (of track or CD)

 SCAN function

The music tracks are played for 8 seconds. At the end of the CD, the CD changer switches automatically into the play forward mode, or into the mode last set.

 Random function

All the titles of a CD are played according to the random principle. Once all the tracks of a CD have been played once, the next CD is automatically loaded and the random function continues. The random function is repeated until it is deactivated.

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 Repeat function

Alternatively a title, a CD or the entire CD magazine is repeated. In the SETTINGS menu, the following functions can be selected:

 Normal track function

 Repeat track

 Repeat CD

 Track mix

CD title allocation, function

Every CD has a permanently stored Table of Contents (TOC) entry. The audio system recognizes the CD through this and can name it automatically after the title has been assigned once by the user even when the CD is inserted into a different CD magazine). The TOC record additionally contains information regarding the number of titles on a CD and the CD's total playing time.

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The selected CD is displayed in display field 1 (display line 1). After this, the magazine of the selected CD is displayed, provided the magazine has already been assigned an index.

The number can be a digit from 0 up to 6.If a new magazine is inserted, the display field remains empty until an index is created.