Marantz SD 5010 Service Manual

The Marantz SD 5010 is a professional cassette deck featuring 3-head configuration, Dolby B/C noise reduction, manual recording level controls, bias and EQ adjustment, pitch control, and metal tape compatibility. This service manual provides comprehensive technical information for qualified service technicians including schematics, alignment procedures, troubleshooting guides, and parts lists.

1. Technical Specifications 2. Block Diagram 3. Circuit Description 4. Disassembly Instructions 5. Alignment Procedures 6. Test Points & Measurements 7. Troubleshooting Guide 8. Parts List 9. Schematics 10. PCB Layouts 11. Service Notes

Technical Specifications

Detailed technical specifications for the Marantz SD 5010 cassette deck.

ParameterSpecification
Heads3-head configuration (erase, record, playback)
Frequency Response20Hz - 21kHz (Metal tape)
Signal-to-Noise Ratio72dB with Dolby C
Wow & Flutter0.025% WRMS
Input SensitivityLine: 50mV, Mic: 0.25mV
Output LevelLine: 0.5V, Headphone: 30mW
Power Requirements120V AC, 60Hz, 25W
Dimensions430 x 125 x 315mm (WxHxD)
Weight7.5kg
Tape CompatibilityNormal, CrO2, Metal

Block Diagram

System block diagram showing signal flow and major components.

  1. Input Stage: Line/Mic inputs with level controls
  2. Record Amplifier: Bias oscillator and record EQ
  3. Playback Amplifier: Playback EQ and Dolby circuits
  4. Output Stage: Line outputs and headphone amplifier
  5. Transport Control: Capstan and reel motor control
  6. Power Supply: +12V, +5V, -12V regulated supplies

WARNING! High voltages present in power supply section. Disconnect power before servicing.

Circuit Description

Detailed description of major circuit sections.

  1. Power Supply: Transformer, rectifiers, regulators
  2. Record/Playback Amplifiers: IC201, IC202 op-amps
  3. Dolby Circuits: IC301 Dolby B/C processor
  4. Motor Control: IC401 transport control IC
  5. Bias Oscillator: 85kHz bias frequency
  6. Meter Driver: Peak level meters with LED drivers

CAUTION! Use proper grounding techniques when testing live circuits.

Disassembly Instructions

Alignment Procedures

Required test equipment: Audio generator, oscilloscope, wow & flutter meter, test tapes.

Playback Alignment: Use 315Hz/10kHz test tape. Adjust PB level and EQ.

Record Alignment: Input 315Hz/10kHz signals. Adjust bias, record level, and EQ.

Head Azimuth: Use 6.3kHz/10kHz azimuth alignment tape.

Dolby Alignment: Use Dolby test tape and adjust Dolby level.

Test Points & Measurements

Key test points and expected voltage measurements.

Test PointDescriptionNormal Value
TP1+12V Regulated+12V ±0.5V
TP2-12V Regulated-12V ±0.5V
TP3+5V Logic+5V ±0.2V
TP4Bias Oscillator85kHz, 25Vpp
TP5Reference Level0dB = 0.775V
TP6Dolby Level200mV ±10%

Troubleshooting Guide

Common problems and solutions for the SD 5010.

SymptomPossible CauseCorrective Action
No powerFuse, power switch, transformerCheck F101 (1A), measure primary voltage
No playbackHead connections, PB amplifierCheck head wiring, test IC202
No recordRecord switch, bias oscillatorCheck S201, measure bias at TP4
Poor sound qualityHead wear, alignmentInspect head, perform azimuth alignment
Transport issuesBelts, motors, control ICCheck belt condition, test IC401

Tip: Always verify power supply voltages first.

Parts List

Critical replacement parts with Marantz part numbers.

  1. Main PCB Assembly: MAR-5010-PCB
  2. Playback Head: MAR-PB-5010
  3. Record Head: MAR-REC-5010
  4. Capstan Motor: MAR-CM-5010
  5. Reel Motor: MAR-RM-5010
  6. Power Transformer: MAR-TX-5010
  7. Main Belt: MAR-BLT-5010
  8. IC201 (Op-amp): NJM4558
  9. IC301 (Dolby): NE645B
  10. IC401 (Control): μPD75104

Schematics

Complete schematic diagrams included in PDF download.

Note: Schematics show component values and test points.

PCB Layouts

Printed circuit board layouts and component locations.

  1. Main PCB - Component Side
  2. Main PCB - Solder Side
  3. Power Supply PCB
  4. Front Panel PCB
  5. Transport Control PCB

WARNING! Observe static precautions when handling PCBs.

Service Notes

Important service information and modifications.

Service Bulletin 5010-1: Updated bias adjustment procedure for metal tapes.

Modification 5010-M1: Improved Dolby tracking for high frequencies.

Common Issues: Belt slippage after 5+ years of use - replace with MAR-BLT-5010.

Calibration: Requires MTT-5010 calibration tape for proper alignment.

Service Support: Contact Marantz technical support for replacement parts.

Marantz SD 5010 Service Manual © - All Rights Reserved 2025