Be sure to add me to your favorites list Original Roland Service Manual for the JW-50 Synthesizer Workstation Keyboard. This is an original Roland service manual booklet for the Roland JW50 Music Workstation synthesizer. It is an original service manual in very good condition, complete and extremely detailed. With specs, panel layout, exploded view, block diagram, parts list, test mode, initialize, circuit diagrams, schematics and more! I have two of these available at this time. 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! Check out my Store!