Marantz SR 5500 Service Manual

The Marantz SR 5500 is a high-performance audio/video receiver featuring Dolby Digital and DTS decoding, 7-channel amplification, multiple audio/video inputs, digital connectivity, and advanced sound 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 & Schematics 9. PCB Layouts 10. Safety Precautions 11. Service Notes

Technical Specifications

Complete technical specifications and performance characteristics of the Marantz SR 5500 receiver.

ParameterSpecification
Power Output100W x 7 channels (8Ω, 20Hz-20kHz, 0.08% THD)
Frequency Response10Hz - 100kHz (+1/-3dB)
Total Harmonic Distortion0.08% (20Hz-20kHz, rated power)
Signal-to-Noise Ratio100dB (IHF-A)
Input Sensitivity200mV (line), 800mV (digital)
Digital InputsCoaxial x 3, Optical x 3
Analog InputsRCA x 8, Phono MM
Video InputsComposite x 4, S-Video x 4, Component x 2
Outputs7.1 pre-out, Zone 2, headphones
Dimensions440 x 161 x 418mm (W x H x D)
Weight12.5 kg
Power Consumption650W maximum

Block Diagrams

System block diagrams showing signal flow and functional relationships between components.

  1. Main System Block Diagram: Overview of entire receiver architecture
  2. Digital Audio Processing Block: DSP and decoding circuitry
  3. Power Amplifier Block: 7-channel amplification stages
  4. Power Supply Block: Main and auxiliary power circuits
  5. Control System Block: Microprocessor and interface circuits

WARNING! These diagrams are for reference only. Always verify actual circuit conditions before servicing.

Circuit Descriptions

Detailed descriptions of major circuit sections and their operation.

  1. Power Supply Circuit: Switching power supply with multiple voltage rails
  2. Digital Audio Board: DSP processor, DAC circuits, and digital interfaces
  3. Analog Audio Circuits: Phono stage, line amplifiers, and tone controls
  4. Video Processing: Video switching and conversion circuits
  5. Microprocessor Control: Main CPU, memory, and control interfaces
  6. Protection Circuits: Over-current, over-temperature, and DC detection

CAUTION! High voltages present in power supply section. Use isolation transformer for testing.

Disassembly Procedures

Step-by-step instructions for disassembling the receiver for service access.

  1. Remove top cover: Remove 6 screws from rear and sides
  2. Remove front panel: Disconnect ribbon cables and remove 4 screws
  3. Access main board: Remove shield covers and mounting screws
  4. Remove power supply: Disconnect all connectors and remove 4 screws
  5. Access amplifier heatsink: Remove thermal compound and mounting hardware

WARNING! Always disconnect power and discharge large capacitors before disassembly.

Test Points & Measurements

Critical test points and standard measurement procedures for verification.

Alignment Procedures

Factory alignment procedures for optimal performance.

Access service mode by pressing TONE + SURROUND + TEST TONE simultaneously on front panel while powering on.

  1. Amplifier Bias Adjustment: VR701-VR707, measure across emitter resistors
  2. DC Offset Adjustment: VR801-VR807, measure at speaker terminals
  3. DSP Processor Calibration: Digital filter coefficients and delay settings
  4. Video Level Adjustment: Composite and component video output levels
  5. Protection Circuit Calibration: Over-current and temperature thresholds

Troubleshooting Flowcharts

Systematic troubleshooting procedures for common failures.

SymptomPossible CauseCorrective Action
No powerPower supply failureCheck AC input, fuse F001, switching transistors Q001-Q002
Protection modeAmplifier faultCheck output transistors, DC offset, over-current detection
No audioDSP or DAC failureVerify digital signal, check DAC IC501, analog switches
No videoVideo processorCheck video IC601, input selection, output buffers
Remote control issuesIR receiver or CPUVerify IR receiver IC901, check CPU control signals
Distorted audioAmplifier biasAdjust bias current, check output stage components

Parts List & Schematics

Complete parts listing with manufacturer part numbers and schematic diagrams.

  1. Main Board Assembly: ICs, transistors, diodes, resistors, capacitors
  2. Power Supply Board: Switching components, transformers, rectifiers
  3. Front Panel Assembly: Display, buttons, IR receiver, connectors
  4. Amplifier Heatsink Assembly: Output transistors, drivers, bias circuits
  5. Connectors & Cables: Internal wiring harnesses and interconnects

Note: Use only manufacturer-specified replacement parts.

PCB Layouts

Printed circuit board layouts for all major assemblies.

CAUTION! Observe ESD precautions when handling PCBs.

Safety Precautions

Essential safety procedures for service technicians.

Always use isolation transformer when testing live circuits. Discharge large capacitors before servicing. Use appropriate personal protective equipment.

WARNING! Lethal voltages present in power supply section. Only qualified technicians should perform service.

Service Notes

Important service information and common repair procedures.

Service BulletinDescriptionAction Required
SB-001Overheating in multichannel modeVerify fan operation, check thermal compound
SB-002Digital audio dropoutReplace digital input receivers IC502-IC504
SB-003Front display dimCheck display power supply, replace backlight
SB-004Protection circuit false triggeringAdjust protection thresholds, replace detection IC
SB-005Remote control intermittentClean IR window, check receiver alignment

Service Support: Contact Marantz technical support for latest service bulletins and firmware updates.

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