Hi All,

I have a Yamaha Disklavier MX100B.

Recently it went into a funky state whereby if a disc is inserted it will just keep playing unless you power off. Pressing stop will stop it for a moment but then it restarts. I suspect that the Play/Pause button is shot. Other symptoms / issues related include. Can not record because can not get recording started. Can not format a disc because once you press "Stop-Record" and get the "Format OK" message, the play/pause button has no effect.

Being brave or stupid I did remove the control unit and tried shooting the button with some electronic parts cleaner. It looks like I could easily replace the circuit board with the buttons and/or the Play/Pause button itself.

Does it seem logical that the play/pause button switch is shot? Certainly it is the most used button. Where might I be able to locate / order either a new switch or else the circuit board assembly that contains the switch?

Thanks.

Side note: my big adventure / mishap came when I removed the control unit. The tiny red wire going to the tiny power switch circuit board came undone. Was able to resolder that to the board. Not fun).

They might still have the parts. Search here to find out.

https://www.yamaha24x7.com/yamahaOMS/SearchParts.aspx

Thanks for the info. Indeed they did have the button assembly available, albeit not cheap.

Once I install it, I will let everyone know if it fixes the problem.

Thanks again.

Just installed the new circuit assembly. Unfortunately, it still continues to play where the stop and pause buttons have no effect. I did discover that if I put a blank or unformatted disc in there I can get to midi mode. If also does stop at end of disc. Any ideas appreciated.

Thanks.