CD-player mode, function as of 1.6.05 with CODE (525) MB Audio 50 APS radio - GF82.60-P-2002SKE

Model 171.4 as of 1.6.05 with CODE (525) MB Audio 50 APS radio

Fig 1: CD-Player Mode Function Chart

Courtesy of MERCEDES-BENZ USA

Schematic for radio and navigation unit (A2/56) with code (819) 6-disk CD changer

CD player mode

CDs can be played via the CD drive of the radio and navigation unit (A2/56) or with the CD player with changer (in glove compartment) (A2/6). The CD player with changer (in glove compartment) (A2/6) has an automatic input slot for 6 CDs. The CDs are loaded centrally via an insertion slot. Each CD can be loaded and removed individually with the 6 selection buttons on the unit. The system is operated with the entry keyboard on the radio and navigation unit (A2/56).

Only 12-cm CDs can be inserted into the CD player with changer (in glove compartment) (A2/6).

The control signals of the control as well as the audio data of the CD player with changer (in the glove compartment) (A2/6) are transmitted via the Media Oriented System Transport (MOST). The audio gateway control unit (N93/1) takes over signal processing and amplification.

If the vehicle is equipped with the audio gateway control unit (N93/1) with code (810) Sound system, the radio and navigation unit (A2/56) must be coded accordingly with the aid of the STAR DIAGNOSIS, otherwise malfunctions can occur when reproducing audio signals.

The CD player operation is selected using the operating unit in the audio/CD menu. When a CD is inserted into the slot of the CD player with changer (in glove compartment) (A2/6), the following functions are available to the user:

Selection of the CD slot in the changer
Loading CD
CD selection
Select track
Search forward/backward
Current play time (of track or CD)

Scan functions
The music tracks are played for 8 seconds. At the end of the CD, the CD player with changer (in glove compartment) (A2/6) automatically changes to the mode last set
Random function
All the tracks 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.
Repeat function
Alternatively one track, all tracks on a CD or all CDs in the CD player with changer (in glove compartment) (A2/6) are repeated.

The following possibilities are available in the menu "Adjustments":

Normal track function
Repeat track
Repeat CD
Select a track sequence

CD title allocation, function

Each CD contains a permanently stored table of contents (TOC entry). Thus, the radio and navigation unit (A2/56) recognizes the particular CD and can automatically name it after the one-time user allocation of the title. The table of contents (TOC record) also contains information on the number of titles on a CD and the total CD playing time.

Playback of an audio CD in MP3 format

The designation "MP3" is an acronym for MPEG 1 Audio Layer 3 and describes an audio compression standard, which permits the compression of digital music signals to approx. 8 % of the original data size. This is done with almost no audible difference to the original signal (CD).

It is also possible to play back CDs in MP3 format in addition to conventional CDs in the CD player with changer (in glove compartment) (A2/6). While doing so, a conventional CD is emulated (simulated).

CD player with changer, location/task/design/ function

with code (819) CD changer (6 CDs)

GF82.64-P-3113SKA