Be sure to add me to your favorites list Original Roland GR-300, G-303 / G-808 Guitar Synthesizer Service Manual / Schematics / Parts List Book, from 1980. This is an original Roland service manual booklet for the now vintage GR-300 guitar synthesizer, and also the G-303 and G-808 guitar synth controller guitars. It is a rare original service manual in very good condition, complete and nicely detailed. This very detailed booklet has exploded views, parts list, circuit diagrams, schematics, adjustments and more. Original Roland document, it's from 1980 and was 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. Thanks for looking, Check out my Store!