This Yamaha O2R Service Manual is a comprehensive guide covering a wide range of topics essential for the maintenance and repair of the recording console. It includes specifications, dimensions, block diagram, circuit board wiring, circuit board layout, panel layout, disassembly procedure, installation/exchange of ram of memory expansion kit (ME4m), LSI pin description, IC block diagram, circuit boards, inspections, test program, error messages, MIDI data format, MIDI implementation chart, circuit diagrams, and parts list.
