Be sure to add me to your favorites list Original Roland GP-8 Guitar Effects Rack Unit Module Service Manual / Schematics / More Booklet, Printed in Japan from 1987. This is an original Roland service manual, for the Roland GP8 rack mounted guitar effects module. It is an original service manual in very good condition, very detailed and complete. There is some creasing and a few marks on it. This vintage service manual has specs, parts list, schematics, block diagram, adjustments and much more. This would be great for working on and repairing your GP unit. Original Roland document, printed in Japan, from 1987! 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!