This service manual provides comprehensive technical information for the Yamaha R-V702 and RX-V492/RDS home audio receivers. It includes detailed diagrams, schematics, and troubleshooting guides to assist technicians in diagnosing and repairing any issues that may arise. The manual also covers component specifications, adjustment procedures, and safety precautions for working with these receivers. This resource is essential for qualified technicians who need to perform repairs or maintenance on these Yamaha audio receivers.