Emily K

Amblorechen, no I haven't yet.

px850user, yes, that what's it sounds like.  Any tips?

One other note: we also get the loud buzz in the headphones when they're plugged in.

Hello, we've had the PX-850 for several years with no issues.  Recently, whenever we hit a high E (two above middle C), as well as E-flat, there's a very loud electric buzzing noise in the left speaker.  It sustains as long as we hold down the key.  It happens in Concert and Modern Mode, but does not happen in Elec Piano mode.  If we press the key very lightly, it does not happen.  I've tried turning off and on the back-up feature in case that was the problem.  I"ve also unplugged the piano and left it off for a while before plugging back in.  Has anyone encountered this?  Any tips?

Hello, I'm actually having the exact same issue as described by Peg above.  The E key (two above middle C) give a loud buzz from the left speaker ever time it's depressed in concert or modern mode.  It does not happen in electric piano mode.  Any tips?