Be sure to add me to your favorites list Original Roland JC-50 Jazz Chorus Guitar Amp Service Manual Schematics Booklet, from 1979. This is an original Roland service manual for the vintage Roland JC-50 Jazz Chorus guitar amplifier. It's from 1979 and is in remarkably very good condition, as it once belonged to a professional repair person, who took very good care of it, and probably used a duplicate, because it does not look like it was used much at all. A few millimeters as best as I can guess, had been cut off at the bottom, I'm assuming so it could fit into his / her binder a certain way. It is an original service manual complete with specs, layout, parts lists, circuit boards, and circuit diagrams / schematics and more. This is the original service notes booklet, from 1979, and was made 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 ... Please check out my Store!