Marantz SR6003 Service Manual

The Marantz SR6003 is a high-performance AV receiver featuring 7.1 channel surround sound, 110W per channel, HDMI connectivity, Audyssey MultEQ room correction, Dolby TrueHD and DTS-HD Master Audio decoding, network audio streaming, and advanced video processing. This service manual provides comprehensive technical information for qualified service technicians including schematics, disassembly procedures, troubleshooting, and calibration instructions.

Technical Specifications

Detailed technical specifications and performance characteristics of the SR6003 receiver.

Parameter	Specification
Power Output	110W per channel (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 weighted)
HDMI Inputs	6 inputs, 1 output (v1.3a with Deep Color)
Digital Inputs	3 optical, 2 coaxial
Analog Inputs	7 stereo pairs + phono
Video Conversion	Analog to HDMI upconversion
Room Correction	Audyssey MultEQ
Power Consumption	650W maximum

Block Diagrams

System block diagrams showing signal flow and major component interconnections.

1. Main System Block Diagram: Overall signal routing and processing
2. Audio Processing Block: DSP and amplification stages
3. Video Processing Block: HDMI and analog video paths
4. Power Supply Block: Voltage regulation and distribution
5. Control System Block: Microprocessor and interface circuits

WARNING! Only qualified technicians should perform service procedures. Disconnect power before servicing.

Disassembly Procedures

Step-by-step instructions for disassembling the receiver for service access.

1. Remove top cover: Remove 8 screws from rear and sides
2. Remove front panel: Disconnect ribbon cables carefully
3. Access main board: Remove shield and mounting screws
4. Remove power supply: Disconnect all connectors and mounting hardware
5. Access HDMI board: Remove specific mounting brackets

CAUTION! Handle circuit boards by edges only. Use proper ESD protection.

Circuit Descriptions

• Power Supply: Switching power supply with multiple voltage rails
• Audio Amplification: Discrete power amplifier stages
• Digital Processing: 32-bit floating point DSP for audio decoding
• HDMI Section: Video switching and processing circuitry
• Control System: Main microprocessor and interface ICs
• Protection Circuits: Over-current, over-temperature, DC detection
• Network Interface: Ethernet and streaming audio circuits

PCB Layouts

Detailed printed circuit board layouts for all major assemblies.

Main Board: Component placement and routing for audio/video processing

Power Supply Board: High-voltage and regulation circuits layout

HDMI Board: Digital video interface component placement

Front Panel Board: Display and control interface layout

All layouts include component designators, test points, and critical signal paths.

Troubleshooting Guide

Systematic approach to diagnosing and repairing common faults.

1. No power: Check AC input, fuse, power supply voltages
2. No audio: Verify input selection, check amplifier stages
3. No video: Test HDMI board, check video processing ICs
4. Protection mode: Investigate amplifier faults, thermal issues
5. Network issues: Verify Ethernet connection, network settings

Tip: Use factory test mode for systematic diagnosis.

Test Procedures

Factory test procedures and performance verification methods.

1. Power supply tests: Verify all voltage rails under load
2. Audio performance: THD, frequency response, power output
3. HDMI verification: Signal integrity, EDID communication
4. Network functionality: Streaming, firmware updates
5. Protection circuits: Overload, short circuit, thermal
6. Control system: Remote, front panel, communication
7. Final alignment: Audio calibration, video settings

WARNING! Use proper test equipment and follow safety procedures.

Calibration Instructions

Factory calibration procedures and adjustment points.

DC Offset Adjustment: Trim pots for each amplifier channel

Bias Current: Set idle current for optimal performance

Audio Levels: Channel balance and output calibration

Video Levels: Color, brightness, and timing adjustments

Network Settings: IP configuration and service access

Parts List

Complete list of components with manufacturer part numbers.

Component Type	Part Number	Description
Main Processor	MAR-DSP-001	32-bit audio/video processor
Power Transistors	MAR-PWR-002	Output devices for amplifier
HDMI IC	MAR-HDMI-003	Video switching processor
Power Supply IC	MAR-PS-004	Switching regulator controller
Display Driver	MAR-DISP-005	Front panel display controller

Safety Precautions

Essential safety information for service technicians.

CAUTION! High voltages present in power supply. Discharge capacitors before servicing. Use isolation transformer for live measurements.

Service Notes

Issue	Solution	Notes
No power	Check F801 (8A fuse)	Common failure point
HDMI no signal	Replace HDMI board	ESD sensitive components
Protection mode	Check output transistors	Use diode test mode
Network failure	Update firmware	Download from Marantz support
Audio distortion	Check bias adjustment	Follow calibration procedure

Service Support: Contact Marantz technical support for additional assistance.

Website: www.marantz.com