JimW

Seems the issue is on the Jack Board with the circuitry associated with the 5218 Op Amp IC1. Q1 and Q2 could also be iffy. Check for anything burnt. Could also try re-seating the connections connecting the Bender Board c...

Same problem. Bought my JD-800 in 1991. Installed new CR2032 battery after the screen starting showing my selected patch had been modified even though I made no modifications and would not respond to any keys from the B...