D550- No longer outputting in stereo

I have a D550 (one of the first ones to be delivered) and it no longer outputs in stereo. Since I can’t find anything in software that would do this I’m assuming that it’s a hardware problem and am looking for a place to start looking. If I can’t fix it, Ill probably send it down to Syntaur for repair. I really don’t use it much, but it is part of my “legacy” and would really like to have it available and running well.


It is a long time since I played a D50, but isn’t it that the two outputs are only two mono outs for upper / lower. If you do not select a split or dual sound, then the signal will be mono only.