Be sure to add me to your favorites list Original Yamaha EZ-250i Electronic Keyboard Overall Circuit Diagrams and Schematics Sheet. Great original Yamaha set of overall circuit diagrams for the EZ250i model Portatone portable keyboard. This is the large overall circuit diagrams, tucked into an original Yamaha envelope with punch holes on one side of it for placing it into a binder if you wanted to do so. Very lightly used and in near like new condition, with some storage wear and discoloration on the envelope. These are original documents from Yamaha, printed in Japan! This is a manual or document, this is NOT a piece of equipment or instrument. If you have any questions, I'm always happy to answer them. Thanks for looking and please check out my Store!