Classe DAC-1

Hi there,
I have/greatly enjoy for quite a while a Classe DAC-1. But I bought it 2nd hand and it came w/o an owner's manual. Could anyone out there send me a good copy - I am prepared to pay for the copy+postage. My problem: can't switch the digital entry (I used it always on Coaxial 2) to the tosslink (after having changed the input cables accordingly). It should be possible via the big black command knob, but I can't move it from Coaxial 2 no matter what. My digital source is a Sony XA777ES set on digital output.
Thx in advance, Joe V.