Be sure to add me to your favorites list Original Roland BN-60 and BN-100 Bass Guitar Amp Service Manual / Schematics Booklet from 1983. This is an original Roland service manual for the vintage Roland BN60 and BN100 bass guitar amplifiers. I have 2 of them available, both show some wear around the edges, but nothing that affects any of the info on the pages. It has specs, layout, parts lists, circuit boards, and circuit diagrams / schematics and more. It's from 1983 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. Thank you for looking! Check out my Store!