GF82.60-P-3116TX Radio Control Panel Component Description

GF82.60-P-3116TX Radio Control Panel Component Description
- with CODE (523) MB Audio 20 radio
- except CODE (498) Japanese version
- except CODE (494) USA version

Component Identification:

Radio control panel location
The radio (A2) is installed in the 2-DIN slot of the center console between the passenger compartment air conditioner operating unit and the upper control panel.

Radio control panel task
The radio control panel is the central controller for:
^ Radio
^ Volume/tone setting
^ CD disk drive (internal)
^ CD changer with 6-disc (Code 819)
^ "Portable CTEL" UPCI telephone system (Code 388)

Radio control panel design
Integrated into the radio are:
^ Display
^ CD drive
^ Audio, tone control and amplification stages
^ Radio tuner

Displays
To be able to see the information in the display better, a gradual brightness adjustment is possible using the cross-shaped rocker switch.

The radio display is divided up into 6 display fields. The following are displayed:
Field 1 Function status
Field 2 User information
Field 3 up to 6 Function groups

A few of these displays are given as abbreviations.

Function status:
^ Roaming/RM Telephone function status active
^ Telephone Cellular phone function status active

User information:
^ Envelope Arrival of an SMS message

Function groups
^ AS Autostore
^ Scan/SC Automatic station search
^ Regional/REG RDS function
^ Repeat/RPT Track repeat
^ Random/RDM Select/play random track
^ Skip Blank/SB Skip blank section
^ TP Traffic program

Radio control panel function
The control buttons and switches in the function keyboard in the radio are read in by the microcontroller and transmitted to the central processor. Depending on the system function, operation of the buttons is processed in the central computer or notified to the other system components in the form of a data telegram via the MOST bus (Media Oriented Systems Transport) or CAN-B Controller Area Network bus Class B (interior)).

If the ON button on the rotary switch is pressed, the radio switches on. The volume is regulated at the rotary switch for the audio source adjusted in each case. The main function keys switch to the audio source selected by the user or the telephone.

If the user presses the "tone setting" function key, the following presets can be changed:
^ Bass
^ Treble
^ Balance
^ Fader
^ Volume adaptation
^ Traffic messages
^ Stereo

The audio source currently being listened to is switched to mute via the "Mute" function button The radio output signal is suppressed and the CD disk drives switch to the pause status. If the user presses the "Tel-send- key", a telephone call is initiated or answered. Pressing the "Tel-end-key" terminates the call.

The 12-button keypad can be used for the following requirements:
^ Entering required telephone number
^ Calling up or saving a radio station
^ Direct entry of a radio frequency
^ Selection of a CD
^ Direct entry of CD track

The cross-shaped rocker switch (cursor key) can be used, e.g. for searching in the telephone book or to carry out permanently programmed commands for the respective function level. If the user presses one of the two "Search" function keys, this function is carried out in the current function level.

"Traffic information" function
The way the radio responds when a traffic message is received depends on the current function status. Traffic messages are ignored if the user has not activated the traffic information function.

If traffic messages are accepted, the control panel changes to the "DISPLAY TRAFFIC MESSAGES" function and displays the symbol "INF" in display field 1. At the same time, the control panel changes to this function status.

The volume of the messages corresponds to the current preset. The station name is also displayed. At the end of the traffic message, the display changes back to the function status active beforehand, the volume being adjusted back to the last selected level.

Off-board diagnosis, STAR DIAGNOSIS
The radio has its own fault memory. Diagnosis is carried out from the central gateway control unit (N93) via the CAN-B to the radio. The radio forms the interface (gateway) to the connected MOST bus users.

Output of the errors on the display unit is not possible.