Marantz SC-11S1 Service Manual

The Marantz SC-11S1 is a high-end audio/video processor featuring advanced audio decoding, video processing, and connectivity options. This service manual provides comprehensive technical information for qualified service technicians, including schematics, block diagrams, adjustment procedures, troubleshooting guides, and replacement parts lists. Below are key sections for technical specifications, service procedures, troubleshooting, and parts information.

Technical Specifications

Detailed technical specifications for the Marantz SC-11S1 audio/video processor.

Block Diagrams

System block diagrams showing signal flow and major components.

1. Main System Block Diagram: Shows overall signal processing path
2. Power Supply Block Diagram: Illustrates power distribution
3. Audio Processing Block Diagram: Details audio signal path
4. Video Processing Block Diagram: Shows video signal routing
5. Control System Block Diagram: Microprocessor and control circuits

WARNING! For qualified service personnel only. High voltages present during operation.

Circuit Descriptions

Detailed descriptions of major circuit sections and their operation.

1. Power Supply Circuit: Switching power supply with multiple voltage outputs
2. Audio Input Circuit: Analog and digital audio input processing
3. Audio Decoding Circuit: DSP-based audio format decoding
4. Video Switching Circuit: HDMI and analog video input selection
5. Microprocessor Circuit: System control and user interface
6. Output Stage Circuit: Audio and video output drivers

CAUTION! Always disconnect power before servicing. Use proper ESD precautions.

Disassembly Procedures

• Top Cover Removal: Remove 6 screws from rear and sides
• Front Panel Removal: Disconnect ribbon cables carefully
• Main Board Access: Remove shield and disconnect all cables
• Power Supply Board: Discharge capacitors before handling
• Heat Sink Removal: Apply thermal paste during reassembly
• Reassembly: Reverse order with proper cable routing

Adjustment Procedures

Factory adjustment procedures requiring test equipment.

Required Equipment: Oscilloscope, Audio Generator, Multimeter, Test Discs

Audio Level Adjustments: Input sensitivity, output level, balance. Video Adjustments: Color temperature, gamma, sharpness. System Adjustments: Clock frequency, processor settings.

Test Points & Measurements

Key test points and expected voltage/ waveform measurements.

1. Power Supply Test Points: +5V, +12V, +3.3V, -12V
2. Audio Test Points: Left/Right channel outputs
3. Video Test Points: HDMI output, component outputs
4. Clock Test Points: System clock, audio clock
5. Control Test Points: Microprocessor reset, data lines

Tip: Use proper grounding and high-impedance probes for accurate measurements.

Troubleshooting Flowcharts

No Power: Check AC input, fuse, power supply voltages. No Audio: Verify input selection, check audio processing ICs. No Video: Test video inputs, check HDMI handshake. Remote Control Issues: Test IR receiver, check microprocessor.

Replacement Parts List

Genuine Marantz replacement parts with manufacturer part numbers.

WARNING! Use only genuine Marantz replacement parts.

PCB Layouts

Printed circuit board layouts for all major assemblies.

1. Main Board PCB: Component placement and routing
2. Power Supply PCB: High-voltage section isolation
3. Front Panel PCB: Button and display layout
4. Input Board PCB: Connector placement
5. Shielding: Ground plane and RF shielding

CAUTION! Observe proper component orientation during replacement.

Safety Precautions

Essential safety information for service technicians.

DANGER! Lethal voltages present. Always unplug unit before servicing. Discharge large capacitors. Use isolation transformer when servicing live circuits. Follow ESD procedures. Wear safety glasses.

Service Notes

Service Contact: Authorized Marantz Service Centers only

Technical Support: service.marantz.com