How do you reset radio on a 92 Mercedes 300e?

To reset the radio on a 1992 Mercedes 300E, start by turning the ignition to the "On" position without starting the engine. Next, press and hold the "Power" button on the radio until it turns off, then release it. Afterward, press the "Power" button again to turn the radio back on. If the radio requires a code, input the code using the preset buttons.