This comprehensive service manual provides detailed technical information for servicing Yamaha RX-V667, HTR-6063, and RX-A700 AV receivers. The manual includes detailed diagrams and instructions for disassembling and reassembling the receiver, along with troubleshooting procedures for common issues. It covers all aspects of the receiver, including front and rear panels, remote control panels, internal components, and specifications. The manual also includes important safety precautions, detailed disassembly procedures, and instructions for updating receiver firmware. Furthermore, it provides guidance on using the receiver's self-diagnostic functions to pinpoint and address technical problems. This service manual is an indispensable tool for technicians and repair personnel working on Yamaha AV receivers from the specified year range.