http://www.beckerautosound.com/612/612_op_manual.html

Do you know which model you have?
This is for the 612

here is a listing for all the models:

http://www.beckerautosound.com/mercedes_year_model_1981-1990.html

If your model is adjustable, you push the star on the right once and then fiddle w/ the musical notes on the left, one note will adjust left, one note will adjust right, push both notes at the same time and it will balance them equally


model 780 operation guide
http://www.beckerautosound.com/780-1988/780_op_manual.html

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