Be sure to add me to your favorites list Yamaha FX770 Guitar Effect Processor Rack Mounted Unit Service Manual Booklet This is a service manual book for the Yamaha FX 770 Guitar Effect Processor Rack Mounted Unit, with specs, panel layout, block diagram, dis-assembly procedure, parts list, exploded views, circuit board diagrams, overall circuit diagrams and more. This booklet is in very good, lightly used condition, and complete. 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 so much for looking! Thanks for looking and please check out my Store!