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Yamaha Original Service Manual PSR-7 Portatone Keyboard.

Original Yamaha service manual for the PSR7 Portatone portable keyboard. This is a full service manual, with specs, panel layout, block diagram, disassembly procedure, test program, parts list, exploded views, circuit board diagrams and more! Original Yamaha document, printed in Japan, from 1989.

• 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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