Getting no sound on middle C key and F# . Same on the next 3 octaves.
1 Like
Corroded key contact board underneath the keys - keys are scanned in sets of 6 - if a copper trace is bad any 6th after that is faulty as well - hence C then F# etc etc
You can try fix the broken section - it does work in certain circumstances or buy replacement from Syntaur
1 Like
@wernersaurus I have a similar issue.
Some keys intermittently no sound, although it’s not replicated across octaves.
Do you happen to have a service manual for the 820 that you can share?
I’d appreciate any help.