As i play notes on my yamaha dgx 500 some keys remain showing on the little screen until a note or notes repeat continually.i can only remove this by turning it off ,sometimes the notes stop sounding alltogether .i cannot get the demo to work either

ask yamaha this, direct to them or read the manual firsts. 2010 made.
lost the manual ? did you?????
any app you run most be from maker yamaha for w10.
Yamaha DGX-640 88-Key Portable Digital Grand Piano with Weight-Graded Hammer Action.all there is , is here
yam

https://usa.yamaha.com/support/updates/index.html?c=digital_pianos&k=640

https://usa.yamaha.com/files/download/other_assets/2/314552/dgx640_en_om_a0.pdf

i guess you talking about what page 15 states.
then page 97 how to do it>?

what it can do is all there song file wise.

it shows w7 max.
but some apps w7 sure can be loaded to w10 or drivers
using windows 10
w7 compatibility mode as MS tells you.
seen here.
windows 10 32bit or 64 I see this too


https://usa.yamaha.com/support/updates/index.html?c=digital_pianos&k=DGX

try these?

https://www.manualslib.com/products/Yamaha-Portable-Grand-Dgx-500-36166.html

Hi
The normal reset is to hold down the highest note ( furtherst white key to the right ) at the same time as turning the instrument on. This will initiate a factory reset.

Try unplugging it and also remove batteries if it has any. Then plug it back in and everything should be back to factory settings. I don't know what to to beyond that.

Hi this is probably cause by the rubber contact failing.
Under each key is a rubber strip which acts as a switch against a PCB when the key is pressed.

Clean or Replace the strip and all should hopefully work again.

Part is either WF212202 or WF212402 depending on the location of the faulty note.

https://www.beckettsmusic.co.uk/shop/scripts/prodView.asp?idproduct=18846

https://www.beckettsmusic.co.uk/shop/scripts/prodView.asp?idproduct=23443

Possibly a rubber contact switch problem.

Open up your keyboard if you feel confident about doing so.

Remove the rubber contact strip under the faulty notes and clear away any dust ( this can be a cause of the note not sounding ) Swap this rubber ( part 220 ) on attached picture with the one next door to it. If the problem has moved to the next octave then it is a worn rubber contact switch replace ( see link )

If not you will probably need to take to a repair centre as it may be more serious.

Perhaps the performance assistant technology is turned on.
Press the [PERFORMANCE ASSISTANT] button to turn it off.

Do you mean,"The HOUSE power went out" or, "The keyboard power went out"?

The function setting is for the PANEL sustain (Page 68 of your manual)

The other method of sustain is by footswitch or pedal option. See page 13.

If you use a footswitch, it needs to be a normally open contact type. If you plug a Roland type in, it is opposite polarity and will sustain UNLESS the pedal is pressed. Make sure nothing else is plugged in the sustain jack... headphones that are inadvertently plugged in there would sustain.

#0031 DGX-630/YPG-635

Hi here is the manual of your Yamaha

techbelkin