The Marantz SR5003 is a high-performance AV receiver featuring 7.1 channel surround sound, HDMI connectivity, Audyssey room correction, multi-room audio capability, and advanced audio processing. This service manual provides detailed technical information, schematics, troubleshooting guides, and service procedures for qualified technicians.
Detailed technical specifications and performance characteristics of the SR5003 AV receiver.
| Parameter | Specification |
|---|---|
| Power Output | 90W x 7 (8Ω, 20Hz-20kHz, 0.08% THD) |
| Frequency Response | 10Hz-100kHz (+1/-3dB) |
| Total Harmonic Distortion | 0.08% (20Hz-20kHz, 8Ω) |
| Signal-to-Noise Ratio | 100dB (IHF-A) |
| HDMI Inputs | 4 inputs, 1 output (v1.3a) |
| Digital Inputs | 3 optical, 2 coaxial |
| Analog Inputs | 6 stereo pairs |
| Video Inputs | Component (3), Composite (4) |
| Dimensions | 440 x 395 x 171mm (WxDxH) |
| Weight | 12.5kg |
System block diagrams showing signal flow and component interconnections.
WARNING! These diagrams are for qualified service personnel only.
Detailed circuit analysis and operational descriptions.
CAUTION! High voltages present - discharge capacitors before servicing.
Service mode access and calibration procedures.
Service Mode: Press TONE + STATUS + M-DAX simultaneously
DC Offset Adjustment: TP1-TP7, target 0mV ±5mV
Bias Current Adjustment: TP8-TP14, target 10mA ±2mA
Power Supply Voltages: +12V, +5V, +3.3V, ±55V rails
HDMI Signal Testing: EDID reading and handshake verification
Systematic diagnostic procedures for common issues.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| No Power | Fuse, power supply | Check F801 (8A), measure standby voltage |
| No Audio Output | Amplifier section | Verify speaker relays, check DC offset |
| HDMI No Signal | HDMI board, cables | Test HDMI output, check EDID data |
| Overheating | Bias current, ventilation | Adjust bias, clean heat sink, check fans |
| Display Issues | Front panel, main board | Test VFD voltage, check ribbon cables |
Critical replacement components and part numbers.
Tip: Use genuine Marantz parts for optimal performance.
Printed circuit board diagrams and component locations.
Main Board: Component side and solder side views
Power Supply Board: High voltage section isolation
HDMI Board: Signal routing and ground planes
Front Panel Board: Display and control interfaces
WARNING! Observe ESD precautions when handling PCBs.
Software update procedures and version history.
CAUTION! Do not interrupt power during firmware update.
Essential safety procedures for service personnel.
Always disconnect AC power before servicing. Discharge large capacitors. Use isolation transformer for live measurements. Follow ESD protection procedures. Verify grounding continuity after repairs.
WARNING! Lethal voltages present - qualified personnel only.
Additional technical notes and service bulletins.
| Issue | Description | Solution |
|---|---|---|
| HDMI Handshake | Intermittent signal loss | Update to firmware 2.1.5 |
| Overheat Protection | Premature shutdown | Clean heat sink, verify bias |
| Network Audio | Dropouts with high-res | Check network settings |
| Zone 2 Audio | No output | Verify amplifier settings |
| Display Flicker | Intermittent VFD | Check -30V supply |
Service Support: Contact Marantz technical support for complex issues.
Document Version: 1.2 - Last updated March 2024