Be sure to add me to your favorites list Original Yamaha Service Manual Book for the EM1400, EM1600, and EM1800 Powered Mixers. This is a great, original, and quite large, Yamaha service manual for the EM1400, the EM1600 and the EM1800 professional powered mixers. It's in very good condition. This is a full service manual, with specs, panel layout, dis-assembly, circuit boards, block diagram, schematic diagrams, parts list and more. I have 2 of these available at this time, the one shown in the photo, and another one that is all original except for the cover sheet which was damaged and replaced with a great copy. 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! Please check out my Store!