Marantz SR9600 Service Manual

The Marantz SR9600 is a high-end AV receiver featuring 7.1 channel surround sound, THX Ultra2 certification, 140 watts per channel, HDMI switching, component video upconversion, Dolby Digital EX, DTS-ES, Dolby Pro Logic IIx, advanced room calibration, RS-232 control interface, and multi-zone capability. This service manual covers technical specifications, circuit diagrams, troubleshooting procedures, calibration methods, and repair instructions for qualified service technicians.

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

Technical Specifications

Detailed technical specifications and performance characteristics of the Marantz SR9600 AV receiver.

Parameter	Specification
Power Output	140W x 7 (8Ω, 20Hz-20kHz, 0.05% THD)
THD	<0.05% (20Hz-20kHz at rated power)
Frequency Response	10Hz-100kHz (+1/-3dB)
Signal-to-Noise Ratio	100dB (line level)
Input Sensitivity	200mV (line), 800μV (FM tuner)
Digital Inputs	HDMI x3, Optical x4, Coaxial x3
Video Inputs	Component x3, Composite x5, S-Video x4
Audio Inputs	7.1CH analog, Phono, XLR balanced
Dimensions	440 x 469 x 194mm (WxDxH)
Weight	24.5kg

Block Diagrams

System architecture and signal flow diagrams for understanding overall receiver operation.

Main System Block Diagram: Shows interconnections between digital, analog, and power supply sections.
Audio Processing Block: Details DSP, DAC, and analog audio signal paths.
Video Processing Block: HDMI, component, and composite video signal routing.
Power Supply Block: Multiple voltage rails and regulation circuits.
Control System Block: Microprocessor, display, and remote control interfaces.

WARNING! These diagrams are for qualified technicians only. Improper use may cause equipment damage.

Circuit Descriptions

Detailed explanations of major circuit sections and their operational principles.

Power Amplifier Section: Discrete power transistors with high-current power supply.
Digital Audio Processing: 32-bit floating point DSP with advanced algorithms.
HDMI Interface: Video switching and audio extraction circuits.
Power Supply: Toroidal transformer with multiple secondary windings.
Protection Circuits: DC detection, thermal protection, and overload shutdown.

CAUTION! High voltages present. Always discharge capacitors before servicing.

Disassembly Procedures

Top Cover Removal: Remove 6 screws from rear panel and 2 from sides.
Front Panel Assembly: Disconnect ribbon cables carefully after removing screws.
Main Board Access: Remove shield plates and disconnect all cables.
Power Supply Board: Discharge main capacitors before disconnection.
Amplifier Heat Sink: Remove thermal compound carefully during reassembly.
Rear Panel Connectors: Note cable positions for proper reassembly.
Display Board: Handle with care to avoid damaging LCD connections.

Test Points & Measurements

Critical test points for voltage, signal, and performance verification.

Test Equipment Required: Digital multimeter, oscilloscope, audio generator, dummy loads, HDMI analyzer.

DC Voltages: +5V, ±12V, ±15V, +48V (protection circuits). Signal Levels: Digital audio clocks, analog audio stages. Performance Tests: Frequency response, distortion, signal-to-noise ratio. Protection Circuits: DC offset, thermal sensor operation.

Alignment & Calibration

Factory calibration procedures and adjustment points for optimal performance.

DC Offset Adjustment: VR601-VR607 for each amplifier channel.
Bias Current Adjustment: VR501-VR507 for optimal class AB operation.
Display Brightness: VR801 for front panel LED intensity.
Protection Thresholds: Software settings via service mode.
Audio Delay: Digital processing timing adjustments.

Tip: Use specified test equipment and follow procedures exactly.

Troubleshooting Flowcharts

Systematic diagnostic procedures for common failure modes.

Symptom	Possible Cause	Corrective Action
No power	Fuse, power supply	Check F801, F802; measure standby voltage; test Q801-Q804.
No audio output	Protection circuit, amplifier	Check protection relay; measure DC offset; test output transistors.
No video	HDMI board, video processor	Test HDMI inputs; check IC601 voltages; verify firmware.
Overheating	Bias current, ventilation	Adjust bias; check fan operation; clean heat sinks.
Display issues	Display driver, power	Test display voltages; check ribbon cables; replace LCD if needed.

WARNING! Always use isolation transformer when testing primary side.

Parts List & Schematics

Complete component listing and detailed circuit diagrams for repair.

Main Board (A): IC601-IC605, Q601-Q615, and associated components.
Power Supply (B): Transformer T801, rectifiers D801-D808, regulators.
Amplifier Section (C): Output transistors, driver stages, protection circuits.
HDMI Board (D): HDMI switches, video processors, memory ICs.
Front Panel (E): Display controller, buttons, IR receiver.
Connectors: All input/output jacks and internal connectors.

CAUTION! Use only specified replacement parts for safety and performance.

Firmware Updates

Procedures for updating receiver firmware and DSP software.

Service Mode Access: Press TONE + STATUS + SURROUND simultaneously. Update Methods: RS-232 connection, USB service tool, network update. Version Check: Display shows current firmware version in service mode. Recovery Procedures: Methods for restoring corrupted firmware.

Safety Precautions

Essential safety procedures for servicing high-power audio equipment.

Unplug unit before disassembly. Discharge power supply capacitors. Use isolation transformer for primary side testing. Follow ESD precautions for digital boards. Verify grounding integrity after repair.

CAUTION! Lethal voltages present. Qualified personnel only.

Service Notes

Additional technical information and common repair observations.

Component	Common Issues	Replacement Part
Output Transistors	Short circuit due to overload	2SC5200/2SA1943 matched pairs
Power Supply IC	Overheating, no standby	STR-G6653
HDMI Controller	No signal detection	SiI9030CTU
Protection Relay	Contact oxidation	G6B-2114P-US
Display Driver	Segment failure	NJU3421

Service Contacts: Marantz Technical Support: 1-800-654-6633; www.marantz.com