This comprehensive service manual provides detailed technical information and repair instructions for the Yamaha RX-V793 and R-V1103 audio receivers. The manual includes detailed schematics, block diagrams, parts lists, troubleshooting guides, and adjustment procedures. It covers all aspects of the receiver's operation, from the power supply and amplification stages to the digital audio processing and control systems. This manual is an invaluable resource for technicians and DIY enthusiasts seeking to diagnose and repair these receivers.