This document pertains to Yamaha AV receivers, specifically models R-V503, R-V703, RX-V393, and RX-V493. These units represent Yamaha's commitment to audio-visual innovation, offering advanced features such as Dolby Digital, DTS, and Dolby Pro Logic decoding, alongside various DSP modes for immersive surround sound experiences. Connectivity options are extensive, with multiple input and output terminals for video and audio signals, catering to a wide range of home entertainment setups. While specific production years are not detailed, the model numbering suggests these are vintage units, reflecting established engineering quality and reliability.

The purpose of this service manual is to provide comprehensive technical information for the maintenance and repair of these Yamaha AV receivers. It covers essential areas including detailed troubleshooting guides for common issues like power, sound, and connectivity problems, along with specific procedures for parts replacement, such as fuse replacement. The manual also offers guidance on general maintenance, cleaning instructions, and speaker setup and calibration. This resource is designed to assist owners, technicians, and service professionals in ensuring the optimal performance and longevity of their Yamaha R-V and RX-V series receivers.