This comprehensive service manual provides detailed technical information and repair procedures for the Yamaha RX-V730, RX-V730RDS, RX-V630, and RX-V630RDS AV receivers, along with their counterparts: the HTR-5560, HTR-5560RDS, DSP-AX630, and DSP-AX630SE. The manual includes a thorough breakdown of the internal components and circuitry, covering areas like the impedance selector, front and rear panels, remote control, and detailed specifications. It serves as an invaluable resource for qualified technicians to diagnose and repair these receivers, ensuring a deep understanding of their operation and troubleshooting methods.