This comprehensive service repair manual provides detailed technical information for the Sony STR-D350Z, D450Z, DE405, and DE505 audio receivers. The manual is an essential resource for technicians and repair professionals who need to diagnose, troubleshoot, and repair these models. It includes detailed schematics, circuit diagrams, component specifications, troubleshooting guides, and repair procedures. The manual covers all aspects of the receiver's operation, including power supply, amplifier, tuner, audio processing, and user interface. With its detailed instructions and clear illustrations, this service repair manual will help you quickly and confidently resolve any issues with these Sony audio receivers.