Well, all switch matrices checked out as well as supply voltages and
oscillators. ESR'd all electrolytics. The only thing that was off is
the LED drive circuits 1,2, and 4 on IC102. On the good board, these
are all at 4.7v when unit is powered off, regardless of state when in
operation. On the bad board, all are at zero. I wouldn't think these
would affect general operation, but who knows. I've checked, and a
couple other eyes have checked for cracks, solder bridges and bent
pins...everything looks good. I'm at wit's end. I'm sure I'll get
motivated to dig around some more after a nice cold brew. Link to
diagram:
http://www.archive.org/download/Part...atic/de845.gif