This service manual provides comprehensive information for servicing the Yamaha RX-E810, RX-E410, and NX-E800 home audio systems. It covers various aspects of these systems, including their system composition, front and rear panel layouts, remote control panels, and detailed specifications. Furthermore, it offers visual guidance with internal views of the systems and outlines disassembly procedures for maintenance and repair. The manual also includes information on using the self-diagnosis function (DIAG) for troubleshooting and provides instructions on adjusting the amplifier settings for optimal performance.