The Marantz SR8500 is a high-performance AV receiver featuring 7.1 channel surround sound, Dolby Digital and DTS decoding, 120W per channel power output, multiple audio/video inputs, digital optical/coaxial inputs, AM/FM tuner, preamp outputs, and advanced audio calibration. This service manual provides technical specifications, troubleshooting procedures, circuit diagrams, and repair guidelines for qualified service technicians.
Complete technical specifications and performance characteristics of the Marantz SR8500 AV receiver.
| Parameter | Specification |
|---|---|
| Power Output | 120W x 7 channels (8Ω, 20Hz-20kHz, 0.08% THD) |
| Frequency Response | 10Hz - 100kHz (+1/-3dB) |
| Total Harmonic Distortion | 0.08% (20Hz-20kHz at rated power) |
| Signal-to-Noise Ratio | 100dB (IHF-A) |
| Input Sensitivity | 200mV (line), 2.5mV (MM phono) |
| Digital Inputs | Optical x 3, Coaxial x 3 |
| Video Inputs | Composite x 6, S-Video x 4, Component x 3 |
| Audio Inputs | Analog x 8, Phono x 1 |
| Outputs | 7.1 preamp, Zone 2, composite/S-video monitor |
| Power Consumption | 650W maximum, 85W standby |
System block diagrams showing signal flow and functional relationships between major components.
WARNING! These diagrams are for reference only. Always verify actual circuit conditions before servicing.
Detailed descriptions of major circuit sections and their operation.
CAUTION! High voltage present in power supply section. Exercise extreme caution.
Factory adjustment procedures requiring specialized test equipment.
Required Equipment: Audio analyzer, oscilloscope, distortion analyzer, signal generator, dummy loads
DC Offset: Adjust VR801-VR807 for 0mV ±5mV at speaker terminals. Bias Current: Adjust VR851-VR857 for 10mA ±2mA across emitter resistors. Tuner Alignment: FM IF alignment at 10.7MHz, AM IF at 450kHz. Dolby Level: Adjust for 200mV output with Dolby test signal.
Systematic troubleshooting procedures for common failure modes.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| No power | Power supply failure | Check fuse F801, bridge rectifier D801, switching transistor Q801 |
| No audio output | Protection circuit activated | Check DC offset, shorted outputs, protection relay RL801 |
| Distorted audio | Bias current incorrect | Adjust bias current, check output transistors |
| No display | Front panel circuit | Check display driver IC, backlight, microprocessor |
| No digital audio | Digital board failure | Check digital input receivers, DSP chip, clock circuits |
Complete listing of replacement parts with manufacturer part numbers.
Tip: Always use genuine Marantz replacement parts for optimal performance.
Printed circuit board layouts showing component placement and trace routing.
Main Board: Double-sided PCB with plated-through holes. Power Supply Board: High-current traces with adequate spacing. Front Panel Board: Single-sided with membrane switch contacts. Tuner Board: Shielded RF section with ground plane.
WARNING! Observe static discharge precautions when handling PC boards.
Complete circuit schematics for all major sections.
Essential safety procedures for service technicians.
Always disconnect AC power before servicing. Discharge large capacitors before testing. Use isolation transformer when testing live circuits. Observe component ratings and replacement specifications. Use appropriate personal protective equipment.
CAUTION! Lethal voltages present. Service by qualified personnel only.
Important service information and common repair procedures.
| Service Bulletin | Description | Application |
|---|---|---|
| SB-8500-001 | Output transistor replacement procedure | All serial numbers |
| SB-8500-002 | Power supply capacitor upgrade | Units manufactured before 2004 |
| SB-8500-003 | DSP firmware update procedure | Version 1.0 to 1.2 |
| SB-8500-004 | Heat sink mounting torque specification | All units |
| SB-8500-005 | Digital input receiver IC replacement | Specific failure mode |
Service Support: Contact Marantz technical support for latest service information.