Need Psr31 schematic

I am looking for a Yamaha PSR-31 schematic. I cannot find any on the web.

Also, what is the alternative main board for that model if any exist.


The main board is long unavailable, and there is no substitute part for it.

We have an overall circuit diagram for it, but not a detailed schematic of the main board. Contact me directly If you’d like me to send that.

I take whatever you give me. I am having hard time figuring out how to send you a private message.

Email me at, and I’ll get it to you that way. Thanks!