This service manual provides comprehensive information for the TX-SR502, TX-SR502E, TX-SR8250, and HT-R520 AV Receivers. These audio-visual receivers are designed to deliver high-quality sound and a robust home theater experience, integrating advanced audio processing and connectivity options. Their engineering emphasizes reliability and performance, making them suitable for a wide range of home entertainment setups.

The scope of this manual covers essential service and repair procedures for these AV receiver models. It details technical specifications, maintenance schedules, diagnostic techniques, and troubleshooting guides. This document serves as a vital resource for technicians and service professionals, enabling them to efficiently maintain, diagnose, and repair these units, ensuring optimal performance and longevity.