Marantz SR5600 Service Manual

The Marantz SR5600 is a high-performance AV receiver featuring Dolby Digital and DTS decoding, 6-channel amplification, multiple audio/video inputs, digital optical/coaxial inputs, AM/FM tuner, preamp outputs, and advanced DSP processing. This service manual provides technical specifications, circuit diagrams, troubleshooting procedures, and maintenance guidelines for qualified service technicians.

1. Technical Specifications 2. Block Diagrams 3. Circuit Descriptions 4. Disassembly Procedures 5. Test Points & Measurements 6. Alignment Procedures 7. Troubleshooting Flowcharts 8. Parts List & Replacements 9. PCB Layouts 10. Safety Precautions 11. Service Notes

Technical Specifications

Detailed electrical and mechanical specifications for the Marantz SR5600 AV receiver.

Parameter	Specification
Power Output	80W x 6 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 (line input)
Input Sensitivity	200mV (line), 2.5mV (MM phono)
Digital Inputs	Optical x2, Coaxial x2
Video Inputs	Composite x4, S-Video x4, Component x2
Audio Inputs	Line x6, Phono, Tape
Dimensions	440 x 161 x 418mm (W x H x D)
Weight	12.5kg

Block Diagrams

System block diagrams showing signal flow and functional relationships.

Main System Block Diagram: Overview of entire receiver architecture
Digital Audio Processing Block: DSP and decoding sections
Power Amplifier Block: 6-channel amplification stages
Power Supply Block: AC/DC conversion and regulation
Control System Block: Microprocessor and user interface

WARNING! For qualified service personnel only. High voltages present in power supply section.

Circuit Descriptions

Detailed circuit analysis and operation principles.

Digital Audio Section: 24-bit/192kHz DAC, Dolby Digital/DTS decoders
Analog Audio Section: Phono preamp, line level circuits
Video Section: Composite/S-Video/Component switching
Power Amplifier: Discrete output stages, protection circuits
Power Supply: Toroidal transformer, regulated supplies
Control Circuit: Main microprocessor, display driver

CAUTION! Static-sensitive components present. Use proper ESD precautions.

Disassembly Procedures

Top Cover Removal: Remove 6 screws from rear panel and sides
Front Panel Removal: Disconnect ribbon cables carefully
Main Board Access: Remove shield covers and mounting screws
Power Supply Board: Discharge capacitors before servicing
Amplifier Modules: Heat sink removal procedure
Reassembly: Reverse order with proper torque specifications

Test Points & Measurements

Key test points and standard measurement procedures.

DC Voltages: Power supply rails (+12V, +5V, ±15V, ±45V)

Audio Tests: Frequency response, distortion, power output

Power Supply: Check all DC outputs under load. Amplifier: Bias current adjustment (15mA per channel). Digital Section: Clock signals, data lines. Tuner: Alignment verification.

Alignment Procedures

Factory alignment and calibration procedures.

AM/FM Tuner Alignment: IF stages, oscillator tracking
Phono Equalization: RIAA curve verification
Amplifier Bias: Adjust to 15mA per channel
DC Offset: Null adjustment for each channel
Display Contrast: Optimize LCD viewing angle

Tip: Use specified test equipment and follow sequence exactly.

Troubleshooting Flowcharts

Systematic diagnostic procedures for common faults.

Symptom	Possible Cause	Corrective Action
No power	Fuse, power supply	Check AC fuse F001 (5A); measure standby voltage
No audio output	Protection circuit	Check speaker relay; measure DC offset
Distorted sound	Amplifier bias	Adjust bias current; check output transistors
No display	Display driver	Check +5V supply to display module
No digital input	Optical receiver	Verify optical signal; check receiver IC

Parts List & Replacements

Complete component listing with recommended replacements.

Semiconductors: Transistors, ICs, diodes with cross-references
Passive Components: Resistors, capacitors, inductors
Electromechanical: Relays, switches, connectors
Mechanical Parts: Screws, brackets, knobs
Recommended Tools: Service jigs, alignment fixtures

WARNING! Use only Marantz-approved replacement parts.

PCB Layouts

Printed circuit board diagrams and component locations.

Main Board: Component side and solder side views. Power Supply Board: High-voltage section identification. Front Panel Board: Switch and display layout. Amplifier Boards: Output device locations.

Safety Precautions

Essential safety procedures for service personnel.

CAUTION! Always disconnect AC power before servicing. Discharge large capacitors. Use isolation transformer for live measurements. Follow ESD protection procedures.

Service Notes

Factory service bulletins and common repair notes.

Common Failures: Power supply capacitors, output transistors. Software Updates: Available from Marantz service portal. Warranty Information: 3-year limited warranty. Service Centers: Authorized Marantz service locations worldwide.

Reset Procedures: Factory reset via front panel combination.

Technical Support: Contact Marantz technical support for schematic updates.