Be sure to add me to your favorites list Original Service Manual for the Roland A-50 Midi Controller Keyboard. This is an original Roland service manual for the Roland A-50 Midi keyboard controller. It is an original service manual in good to very good condition, with some slight signs of wear, mostly around the edges, and it's complete and extremely detailed. With specs, dis-assembly, location of controls, exploded views, block diagrams, test mode, parts list, circuit diagrams, schematics and more! I have 2 of these available as of this listing. 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!