Be sure to add me to your favorites list Original Yamaha MODUS F11 Digital Piano Overall Circuit Diagram Sheets in Their Original Yamaha Cover. These are an original Yamaha set of overall circuit diagrams for the big MODUS F11 model of electronic digital piano keyboard. This is the large overall circuit diagrams, all tucked into an original Yamaha service envelope with holes on one side of it for placing it into a binder if you wanted to do so. Very lightly used and in very good condition. The envelope shows some storage wear. These are original documents from Yamaha, made in Japan, from 2012. 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!