Thanks for your reply!
TAPE2 produces exactly the same result; pressing the TAPE2 or AUX buttons, with or without an input connected, does not trigger anything. Those 2 inputs can’t be activated.
All other pushbuttons (Radio, CD, Tape) are perfectly functional.
Maybe connecting the speakers will change this behavior (they aren’t connected yet, because I’m yet to receive a pair of 2-pin plugs to connect them).
