I finally had a chance to take a look at the instability issue. Thanks for the suggestions. However, all pushbuttons are "out" except the filters. (Fixed, Store, RCT are "out" and the Aux Program is in the "norm" position.)
Since I don't have a service manual, where is the DR7 board located? I noticed that there is a vertical board just behind the right side front panel that is on a plug-in board. I did re-seat it. No joy.
Anywhere on the 'net to download a service manual?
Bill KW8KW

