This comprehensive service manual provides detailed technical information and repair instructions for the Yamaha R-V502 and RX-V392RDS audio/video receivers. It includes detailed schematics, wiring diagrams, component layouts, part numbers, troubleshooting guides, and calibration procedures. This manual is an essential resource for technicians and repair specialists working on these receivers, offering a complete understanding of their internal workings and providing the necessary guidance for accurate diagnosis and repair.