This comprehensive service manual provides detailed instructions and technical information for repairing and servicing Yamaha RX-V357 and HTR-5830 AV receivers. It covers a wide range of topics, including impedance selection, front and rear panel components, remote control panels, detailed specifications, internal component identification, step-by-step disassembly procedures, and a comprehensive guide to the self-diagnosis function (DIAG). The manual also includes instructions for troubleshooting and resolving common issues. This manual is an essential resource for technicians and repair professionals who need to understand the inner workings of these AV receivers and perform repairs effectively.