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Original Yamaha PSR-S500 and PSR-S550B Workstation Keyboard Overall Circuit Diagrams and Schematics in Cover.

Great original Yamaha set of overall circuit diagrams for the PSR-S500 and PSR-S550B models of digital workstation keyboards. These are the large overall circuit diagrams, all 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. They are very lightly used and in close to like new condition, with the envelope having a little storage wear and creases.

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.

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