This comprehensive service manual provides detailed instructions and technical specifications for the Yamaha R-V701 and RX-V490 receivers. It covers a wide range of topics, including troubleshooting, repair procedures, component identification, wiring diagrams, and adjustments. Whether you are an experienced technician or a DIY enthusiast, this manual will equip you with the necessary knowledge and guidance to diagnose and repair these receivers effectively. The manual is a valuable resource for anyone who wants to understand the inner workings of these Yamaha receivers and perform maintenance or repairs with confidence.