Marantz SR5400 Service Manual

The Marantz SR5400 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, and advanced surround sound processing. This service manual provides comprehensive technical information for service technicians, including schematics, alignment procedures, troubleshooting guides, and replacement parts information.

Technical Specifications

Complete technical specifications for the Marantz SR5400 AV receiver.

Parameter	Specification
Power Output	80W x 6 channels (8 ohms, 20Hz-20kHz)
Total Harmonic Distortion	0.08% (20Hz-20kHz)
Frequency Response	10Hz-100kHz (+1/-3dB)
Signal-to-Noise Ratio	100dB (line input)
Input Sensitivity	200mV (line), 2.5mV (phono)
Digital Inputs	Optical x2, Coaxial x2
Video Inputs	Composite x4, S-Video x3
Audio Inputs	6-channel x1, Phono x1
Dimensions	440 x 157 x 418mm (WxHxD)
Weight	11.5kg

Block Diagrams

System block diagrams showing signal flow and major components.

1. Main System Block Diagram: Shows overall signal path from inputs to outputs.
2. Power Supply Block Diagram: Illustrates power distribution and regulation.
3. Audio Processing Block Diagram: Details DSP and decoding circuits.
4. Video Processing Block Diagram: Shows video switching and processing.
5. Tuner Block Diagram: AM/FM tuner section schematic.

WARNING! Always refer to block diagrams before attempting repairs to understand signal flow.

Circuit Descriptions

Detailed descriptions of major circuit sections and their operation.

1. Power Supply Circuit: Switching power supply with multiple voltage outputs.
2. Main Amplifier Circuit: 6-channel discrete power amplifier design.
3. Digital Audio Processor: 24-bit/96kHz DSP with Dolby Digital/DTS decoding.
4. Video Switching Circuit: Composite and S-Video switching matrix.
5. Microprocessor Control: System control and user interface.

CAUTION! High voltages present in power supply section - discharge capacitors before servicing.

Disassembly Instructions

• Step 1: Remove top cover by unscrewing 6 Phillips screws.
• Step 2: Remove front panel by releasing 4 clips and disconnecting ribbon cables.
• Step 3: Remove main board by disconnecting all cables and removing 8 mounting screws.
• Step 4: Access power supply board by removing shield and disconnecting connectors.
• Step 5: Remove amplifier heat sink after disconnecting speaker outputs.
• Tools Required: Phillips screwdriver, anti-static wrist strap, plastic spudger.

Alignment Procedures

Factory alignment procedures for optimal performance.

DC Offset Adjustment: Adjust VR601-VR606 for 0mV ±5mV at speaker terminals.

Bias Current Adjustment: Set VR701-VR706 for 10mA across test points.

Dolby Digital Level: Use test disc to calibrate channel levels.

Tuner Alignment: FM alignment at 98MHz, AM alignment at 1MHz.

Test Equipment: Oscilloscope, multimeter, audio generator, test discs.

Troubleshooting Guide

Common issues and diagnostic procedures.

Symptom	Possible Cause	Corrective Action
No power	Power supply failure	Check fuse F001, measure +5VSTBY, replace Q001 if needed
No audio output	Amplifier protection	Check DC offset, replace shorted output transistors
No digital sound	DSP failure	Check IC701 clock signals, replace crystal X701
Display issues	Front panel circuit	Check ribbon cable CN901, replace display driver IC
Overheating	Cooling system	Clean heat sink, check fan operation, replace thermal compound

Replacement Parts List

Critical replacement components with manufacturer part numbers.

Part Number	Description	Manufacturer
2SC5200	Output Transistor NPN	Toshiba
2SA1943	Output Transistor PNP	Toshiba
IC701	DSP Processor	Analog Devices
IC801	Microprocessor	Renesas
F001	Main Fuse 6.3A	Littlefuse
X701	16.9344MHz Crystal	ECS
C101	Main Capacitor 10000uF	Rubycon

PCB Layouts

Printed circuit board layouts for all major boards.

1. Main Board: Component placement and trace routing.
2. Power Supply Board: High-voltage section isolation.
3. Front Panel Board: Display and control circuits.
4. Amplifier Board: Output stage component placement.
5. Tuner Board: RF section layout and grounding.

Tip: Use PCB layouts to identify test points and component locations.

Wiring Diagrams

Complete wiring diagrams for internal connections.

Includes:

• Main board to front panel ribbon cable connections
• Power supply to main board power distribution
• Speaker output terminal wiring
• Input/output connector pinouts
• Grounding scheme and star ground points

WARNING! Verify all connections against wiring diagrams after reassembly.

Safety Precautions

Essential safety procedures for service technicians.

Always disconnect AC power before servicing. Use isolation transformer when working on live circuits. Discharge large capacitors before handling. Use anti-static protection for CMOS devices. Follow local electrical safety regulations.

CAUTION! High voltages present - lethal shock hazard exists.

Service Notes

Important service observations and common failure points.

Issue	Observation	Solution
Protection mode	Often caused by DC offset	Check output transistors and bias circuits
Display blank	Front panel processor failure	Replace IC901 and reprogram
Intermittent operation	Power supply capacitors aging	Replace electrolytic capacitors in power supply
No digital audio	Clock circuit failure	Replace crystal X701 and check DSP supply voltages

Service Contacts: Marantz Service Department 1-800-654-6633

Technical Support: service.marantz.com