Followup
Well, it's working now. For the first day or two after I got it the panel did not light up at all. Then, the panel lit up and worked for twenty minutes or so. Finally, as of a couple of days ago it works fine.
Go figure, huh?
I'm guessing it was some sort of internal battery that needed to recharge. Or evil spirits that needed exorcising.
So if anyone else gets a used 563A that doesn't light up maybe my experience will help...
Now all I need is some SACDs and DVD-A discs to hear for myself what the fuss is about.