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. I sold one of these recently and found that I had another one, albeit in a more used condition, so it's priced less. It is a rare original service manual in fair to good condition, complete and nicely detailed. This one got damp at one time, as the pages are wrinkled, stained and stiff. However, other than the one spot seen in the last photo, all of the information is visible and can be used. There is one spot with a tear where the pages had been stuck together, but the info is there, and that other spot where a few lines are missing. There are some stains and a couple of small tears near the staples. 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!