Page 1 of problem with DENON DRA-F102DAB reciever

Hi, I wonder if any one can help, I`ve got one of the above recievers and have been using its optical output to record on Mini-disc. after a recent rearrangement of my living room, this output seems to have stopped working. does anyone know if there`s a setting somewhere which might switch this output on and Off ? I can`t find one on the menus, but may be missing a trick

thanks in advance

Steve Harris