Marantz 2600 Service Manuals

The Marantz 2600 is a high-performance stereo receiver from the classic Marantz audio equipment line, featuring advanced tuner technology, powerful amplification, and premium audio components. This service manual provides comprehensive technical documentation for repair technicians, including schematics, alignment procedures, parts lists, and troubleshooting guides for proper maintenance and repair of the Marantz 2600 receiver.

1. Technical Specifications 2. Circuit Diagrams 3. Alignment Procedures 4. Parts List 5. Block Diagrams 6. Troubleshooting Guide 7. Test Equipment Requirements 8. Safety Precautions 9. Service Notes 10. Warranty Information 11. Contact Information

Technical Specifications

Complete technical specifications for the Marantz 2600 stereo receiver including power output, frequency response, and electrical characteristics.

ParameterSpecification
Power Output260 Watts RMS per channel (8 ohms)
Total Harmonic Distortion0.03% at rated power
Frequency Response10Hz - 50kHz (+0, -1dB)
Signal-to-Noise Ratio75dB (Phono), 90dB (Aux)
Input Sensitivity2.5mV (Phono), 250mV (Aux)
Tuner SectionFM/AM with quartz PLL synthesis
Damping Factor60 at 8 ohms
Power Requirements120V AC, 60Hz, 650W max
Dimensions21.25" W × 7.5" H × 18.5" D
Weight58.5 lbs

Circuit Diagrams

Detailed schematic diagrams for all major circuit sections including power supply, amplifier, preamplifier, and tuner sections.

  1. Main Power Amplifier Circuit: Complete schematic with component values and test points.
  2. Preamplifier Section: Phono and line-level input circuits with equalization networks.
  3. Power Supply: Regulated power supply circuits with protection systems.
  4. FM Tuner Section: RF, IF, and detector circuits with alignment points.
  5. Protection Circuits: Speaker protection and thermal management systems.

WARNING! High voltage present in power supply section. Use proper safety equipment when servicing.

Alignment Procedures

Step-by-step alignment procedures for FM/AM tuner sections and audio circuits to restore original performance specifications.

  1. FM Front End Alignment: Adjust RF circuits for maximum sensitivity.
  2. IF Alignment: Align 10.7MHz IF stages using sweep generator.
  3. Stereo Decoder: Adjust multiplex decoder for proper stereo separation.
  4. AM Tuner: Align AM RF and IF circuits for optimal reception.
  5. Bias Adjustment: Set output stage bias current to specified values.

CAUTION! Use specified test equipment and follow procedures exactly to prevent damage.

Parts List

Block Diagrams

System-level block diagrams showing signal flow and interconnections between major circuit sections.

Main System: Input selection → Preamplifier → Tone controls → Power amplifier → Output protection.

Tuner System: Antenna input → RF amplifier → Mixer → IF stages → Detector → Stereo decoder → Audio output.

Power Supply: AC input → Transformer → Rectifier → Regulators → Protection circuits → DC outputs.

Troubleshooting Guide

Systematic troubleshooting procedures for common problems and performance issues.

  1. Verify power supply voltages before proceeding with other diagnostics.
  2. Check protection circuit status and reset procedures.
  3. Use signal injection to isolate faulty stages in audio path.
  4. Measure bias currents in output stages before replacing transistors.
  5. Verify tuner alignment before replacing tuner components.

Tip: Always start with simplest solutions - check fuses, connections, and controls first.

Test Equipment Requirements

Essential test equipment needed for proper servicing and alignment of the Marantz 2600.

  1. Oscilloscope: Dual trace, 20MHz minimum bandwidth.
  2. Audio Generator: 20Hz - 20kHz with low distortion.
  3. Multimeter: Digital with high input impedance.
  4. FM Signal Generator: With stereo modulation capability.
  5. Dummy Load: 8 ohm non-inductive, 300W capacity.
  6. Distortion Analyzer: For verifying low distortion performance.
  7. DC Power Supply: Variable for testing individual circuits.
  8. Isolation Transformer: For safety when working on live chassis.

WARNING! Use properly calibrated test equipment for accurate measurements.

Safety Precautions

Critical safety information for technicians working on high-power audio equipment.

Service Notes

Important service bulletins, common failure points, and recommended modifications.

CAUTION! Observe electrostatic discharge precautions when handling MOSFET output devices.

Warranty Information

Original warranty terms and conditions. Service during warranty period requirements and procedures.

Contact Information

Service IssueRecommended ActionContact Information
Technical SupportCircuit analysis and repair guidanceMarantz Technical Support: 1-800-555-1234
Parts OrdersGenuine replacement partsMarantz Parts Department: [email protected]
Schematics RequestAdditional documentationService Documentation: [email protected]
Warranty ServiceAuthorized service centersWarranty Administration: [email protected]
General InquiriesProduct informationCustomer Service: 1-800-555-5678

Online Resources: www.marantz.com/service for downloadable updates and bulletins.

Authorized Service: Contact for list of certified Marantz service centers.

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