Hi Scott, Gary and Donnie: (You too, Mason)

First, let me answer Scott's question. The 1/4 inch Headphone Jack is not inserted into the keyboard. My buddy Hackworth taught me how to silence the speakers by plugging in a "dumb" jack into the slot. During recording, the sound from the keyboard is monitored via the digital recorder. I plugged my headphones into the recorder but had to silence the speakers.

Gary, $20 bucks is a steal if that really is the problem. Is it soldered into the circuits or does it have a plug?

I checked it again yesterday to see if leaving the headphone jack "empty" overnight might bring it back to life. No joy!
Then I re-inserted the headphones and the sound was perfect through the headphones. I re-read the manual and found nothing to lead me out of the wilderness of soundless speakers.

Thanks, guys... for all your interest and suggestions. I'll continue to wait before attempting "surgery."

All the best,

Dave Rice