On Mon, 07 Jun 2010 16:42:13 -0500, Chuck wrote:

Hello.

I used to work for an Adcom warranty station and remember this was a
common problem but I can't recall what the cure is. If anyone has a
solution I'd really appreciate it. Thanks. Chuck

The problem turned out to be conductive glue on the ribbon cable from
the on-standby switch to the upc board. It wasn't visible from the
top of the unit. I found a pin out of the upc and noticed unusual
activity on the key lines. This activity ceased and the unit
functioned properly when the cable from the switch was detached at the
upc board. When I removed the switch from the circuit board, I
noticed a wisp of conductive glue at the cable end. Once the glue was
removed, the unit functioned normally. Chuck