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Yamaha PSR-S700 and PSR-S900 Keyboard Original Overall Circuit Diagram / Schematics in Cover.

Great original Yamaha set of overall circuit diagrams for the PSR-S700 and PSR-S900 models of Portatone workstation keyboards. This is the large overall circuit diagrams, all tucked into an original Yamaha service envelope with holes on one side of it for placing it into a binder if you wanted to do so. Lightly used and in close to like new condition, with the envelope having a little storage wear / 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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