🏷️ Basic Information Identification Make: Marantz Model: SR7500/SR8500/PS7500/PS8500 Year: Unknown Generation: Not Applicable 📋 Manual Details Document Information Manual Type: Service Manual Language: English Page Count: Unknown Format: PDF Content Summary Technical Specifications: Included Technical Description: Included Power Amplifier Adjustment: Included Service Mode: Included System Error Handling: Included Firmware Update: Included Wiring Diagram: Included Block Diagram: Included Schematics: Included 🔧 Maintenance Troubleshooting Common Errors: System Error codes (detailed in manual) Firmware Firmware Update Method: Via RS-232 port or other specified method Adjustment Power Amplifier Bias: Adjustable (Procedure detailed) 📄 Technical Specs Audio Output Output Power Per Channel: SR7500: 90W per channel (8 ohms, 20Hz-20kHz, 0.08% THD) / SR8500: 110W per channel (8 ohms, 20Hz-20kHz, 0.08% THD) Audio Processing Surround Formats: Dolby Digital, DTS, DTS ES, Dolby Pro Logic II, etc. (Specific list depends on exact model and firmware) Connectivity Hdmi Inputs: Unknown (Likely varies by specific variant, but likely present in later revisions or SR8500) Component Video Inputs: Multiple (Specific number varies) Digital Audio Inputs: Optical, Coaxial (Multiple) Pre Outs: Full 7.1 channel pre-outs Power Supply Power Consumption: Unknown (Typical for AV Receivers: 300-500W) Audio Performance Frequency Response: 10Hz-100kHz Signal To Noise Ratio: 105dB (Direct mode)