This comprehensive service manual is designed for technicians and repair specialists working with Yamaha's RX-V1200, RX-V1200RDS, HTR-5490, and RX-V2200 home theater systems. It provides detailed information on various aspects of the system, aiding in diagnosis and repair. The manual covers crucial components like the impedance selector, front and rear panels, remote control transmitter, and specifications for each model. Additionally, it offers a visual understanding of the internal view and provides detailed disassembly procedures to facilitate repairs. A vital part of the service manual is the self-diagnosis function description, allowing technicians to pinpoint potential issues within the system.