From inside (document excerpt):
User and Operator’s Manual for 1992, 1993 and 1994 Mercedes-Benz Becker 1432 Sound System. Free PDF Guide Download.
Overview
Prepare to enjoy the many pleasures of listening to a superb sound system: the Mercedes-Benz AM and FM stereo radio with cassette player. This Operation Guide is designed to give you both a quick reference of basic functions and features and a detailed description of the system’s entire range of operation. To maximize your listening satisfaction, take a few minutes to carefully review all sections of this guide.
Note: The following instructions also include the functions of the optional dealer-installed trunk-mounted compact disc changer. Not available in station wagon models.
BASIC CONTROLS 1 Power Button
DISPLAY PANEL TUNING
1 Indicator for Tone Control 1
2 Volume Bar
3 Bass Control/Balance Left Button
4 Treble Control/Balance Right Button
5 Mode Button (Selection of Operating Mode)
RADIO FUNCTIONS
2 Stereo Indicator 2
3 Indicator for Tuner 3
Frequency, Antitheft Code and Balance Setting
4 Indicator for Selected 4
Station Recall Button
5 Wave Band Indicator 5
6 Indicator for Tuning 6
Sensitivity Setting
7 Wave Band and Station Recall Buttons
Function Control Button Tuning Sensitivity Button
Seek Tuning Bar
Scan Tuning Bar
Manual Tuning – Increasing Station Frequency
Manual Tuning – Decreasing Station Frequency
CASSETTE PLAYER FUNCTIONS
BASIC CONTROLS 1 Power Button
DISPLAY PANEL
1 Indicator for Tone Control
2 Volume Bar
3 Bass Control/Balance Left Button
4 Treble Control/Balance Right Button
5 Mode Button (Selection of Operating Mode)
2 Indicator for Antitheft Code, Balance Setting and Cassette Functions
3 Indicator for Dolby® B and C Button
CASSETTE OPERATION
1 Reverse Music Search/Fast Rewind Button
2 Forward Music Search/Fast Forward Button
3 Track Selection Button, Eject Button (Push and Hold)
4 Tape Selection Button
5 Dolby® B and C Button
6 Cassette Port
COMPACT DISC CHANGER FUNCTIONS
BASIC CONTROLS
1 Power Button
2 Volume Bar
3 Bass Control/Balance Left Button
4 Treble Control/Balance Right Button
5 Mode Button (Selection of Operating Mode)
DISPLAY PANEL
1 Indicator for Tone Control
2 Indicator for CD Function
3 Disc Indicator
4 Track Indicator
5 Random Track Play Indicator
CD OPERATION
1 Function Control Button
2 Disc Selection Buttons
3 Forward Music Search/Fast Forward Button
4 Reverse Music Search/Fast Reverse Button
5 Number of Track Display Button
6 Random Track Play Button 7 Elapsed Playing Time Button