Be sure to add me to your favorites list Yamaha Original Service Manual Book PSR-6000 Portatone Midi Keyboard Workstation. Very good + condition, original Yamaha service manual for the excellent PSR-6000 workstation keyboard. It's a very large document, as this is a large and sophisticated instrument. This service manual has specs, panel layout, block diagram, MIDI implementation, disassembly procedure, test program, parts list, exploded views, circuit board diagrams, the overall foldout circuit diagram and more. See the photo! 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. Thank you so much for looking! Check out my Store!