Be sure to add me to your favorites list Yamaha Original Service Manual Book for DEQ5 Rack Mount Digital Graphic Equalizer EQ Unit. Great, original Yamaha service manual for the Yamaha DEQ5 Rack mounted graphic equalizer. This service manual has specs, panel layout, block diagram, circuit boards, parts list, exploded view and more! Original Yamaha booklet from 1992, it is in very good condition, and quite thick as well. 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!