Marantz SR 7000 Service Manual

The Marantz SR 7000 is a high-performance AV receiver featuring Dolby Digital and DTS decoding, 100W per channel (8 ohms), 6-channel amplification, multiple audio/video inputs, digital optical/coaxial inputs, AM/FM tuner, preamp outputs, speaker A/B switching, and advanced surround sound processing. This service manual provides technical specifications, circuit diagrams, troubleshooting guides, and repair procedures 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 9. PCB Layouts 10. Schematics 11. Service Notes

Technical Specifications

Detailed electrical and mechanical specifications for the Marantz SR 7000 AV receiver.

ParameterSpecification
Power Output100W x 6 (8 ohms, 20Hz-20kHz, 0.08% THD)
Frequency Response10Hz - 100kHz (+1/-3dB)
Total Harmonic Distortion0.08% (20Hz-20kHz at rated power)
Signal-to-Noise Ratio100dB (line inputs)
Input Sensitivity200mV (line), 2.5mV (MM phono)
Digital InputsOptical x2, Coaxial x2
Video InputsComposite x4, S-Video x3
Audio InputsLine x6, Phono, Tape
Dimensions440 x 161 x 418mm (W x H x D)
Weight14.5 kg

Block Diagrams

System block diagrams showing signal flow and functional relationships between circuit sections.

  1. Main System Block Diagram: Shows overall signal path from inputs to outputs
  2. Power Supply Block Diagram: Illustrates voltage regulation and distribution
  3. Digital Processing Block Diagram: Details DSP and decoding circuitry
  4. Audio Amplification Block Diagram: Shows power amplifier stages
  5. Tuner Section Block Diagram: AM/FM receiver circuitry

WARNING! High voltages present in power supply section. Exercise extreme caution when servicing.

Circuit Descriptions

Detailed explanations of major circuit sections and their operation.

  1. Power Supply Circuit: Switching power supply with multiple voltage rails
  2. Digital Audio Processor: 24-bit/96kHz processing with Dolby Digital/DTS
  3. Power Amplifier Section: Discrete output stages with protection circuits
  4. Preamp/Control Section: Input selection and volume control
  5. Tuner Circuit: PLL synthesized AM/FM tuner with preset memory

CAUTION! Static-sensitive components. Use proper ESD protection.

Disassembly Procedures

Test Points & Measurements

Key test points for voltage and signal measurements during troubleshooting.

Power Supply Test Points: TP1 (+12V), TP2 (+5V), TP3 (+3.3V), TP4 (-12V)

Audio Section: Input levels, output power measurements, distortion analysis. Digital Section: Clock signals, data lines, processor operation. Protection Circuits: DC detection, thermal shutdown, overload protection.

Alignment Procedures

Factory alignment procedures for tuner and audio sections.

  1. FM Tuner Alignment: RF, IF, and detector adjustments
  2. AM Tuner Alignment: Oscillator and antenna tracking
  3. Dolby Digital Decoder: Level matching and delay settings
  4. Speaker Distance Settings: Digital delay calibration
  5. Test Equipment Required: Signal generator, oscilloscope, distortion analyzer

Tip: Use factory test modes for service adjustments.

Troubleshooting Flowcharts

Step-by-step diagnostic procedures for common failure modes.

SymptomPossible CauseCorrective Action
No powerPower supply failureCheck fuse F001, diodes D001-D004, IC001
No audio outputAmplifier/protection circuitCheck speaker relays, output transistors, protection IC
No digital soundDigital processorVerify clock signals, reset circuit, DSP IC
Tuner not workingTuner module/PLLCheck tuner power supply, PLL lock, antenna input
OverheatingBias current/ventilationAdjust bias current, check fans, clean heat sinks

Parts List

Complete component listing with manufacturer part numbers.

  1. Integrated Circuits: DSP, DAC, microprocessor, power regulators
  2. Transistors: Output devices, drivers, small-signal transistors
  3. Diodes: Rectifiers, zeners, signal diodes
  4. Capacitors: Electrolytic, ceramic, film types with values
  5. Resistors: Carbon film, metal film, power resistors
  6. Mechanical Parts: Knobs, buttons, connectors, hardware
  7. Optional Parts: Upgrade components and accessories

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

PCB Layouts

Printed circuit board layouts for all major assemblies.

Main Board: Component placement and trace routing. Power Supply Board: High-current paths identified. Front Panel Board: Display and control circuitry. Amplifier Module: Output stage layout with thermal considerations.

Schematics

Complete circuit diagrams for all sections.

  1. Main System Schematic: Overall system connectivity
  2. Power Supply Schematic: AC input to DC outputs
  3. Audio Amplifier Schematic: Input to speaker outputs
  4. Digital Processing Schematic: DSP and surrounding circuits
  5. Tuner Schematic: AM/FM receiver circuitry
  6. Control System Schematic: Microprocessor and interface
  7. Protection Circuit Schematic: Overcurrent/thermal protection

CAUTION! Schematics show live circuits. Disconnect power before servicing.

Service Notes

Important service information and common repair issues.

Service Support: Contact Marantz technical support for additional assistance.

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