Marantz CD67SE Service Manual

The Marantz CD67SE is a high-quality CD player featuring advanced digital-to-analog conversion, precision laser mechanism, servo control systems, and comprehensive audio output options. This service manual provides detailed technical information for qualified service personnel including schematics, alignment procedures, troubleshooting guides, and replacement part specifications.

1. Technical Specifications 2. Block Diagram Overview 3. Circuit Descriptions 4. Mechanical Assembly 5. Alignment Procedures 6. Test Points & Measurements 7. Troubleshooting Guide 8. Parts List 9. PCB Layouts 10. Safety Precautions 11. Service Notes

Technical Specifications

Complete technical specifications for the Marantz CD67SE CD player system.

Parameter	Specification
Frequency Response	2Hz - 20kHz (±0.5dB)
Signal-to-Noise Ratio	>100dB
Dynamic Range	>95dB
Total Harmonic Distortion	<0.003%
Channel Separation	>90dB (1kHz)
Output Voltage	2.0V RMS
Power Requirements	AC 120V, 60Hz / 230V, 50Hz
Power Consumption	15W
Dimensions (W×H×D)	440×95×315 mm
Weight	4.5 kg

Block Diagram Overview

System architecture and signal flow description.

Laser Pickup Assembly: Reads digital data from CD surface
RF Amplifier: Processes raw signal from pickup
Servo Control: Manages focus, tracking, and spindle motors
Digital Signal Processor: Decodes EFM signal and error correction
D/A Converter: 1-bit Delta-Sigma conversion system
Analog Output Stage: Low-pass filtering and amplification
Power Supply: Multiple regulated voltage rails
Control System: Microprocessor and display interface

WARNING! Only qualified technicians should perform service procedures. High voltages present.

Circuit Descriptions

Detailed analysis of major circuit sections.

Laser Power Control: Automatic power calibration circuit
Focus & Tracking Servo: Closed-loop control systems
Spindle Motor Drive: Constant linear velocity control
Digital Filter: 8-times oversampling digital filter
D/A Conversion: 1-bit MASH conversion technology
Analog Output: Dual differential configuration
Power Supply: Transformer with multiple secondary windings
Microprocessor Control: System timing and user interface

CAUTION! Static-sensitive components require proper handling procedures.

Mechanical Assembly

Chassis: Steel construction with vibration damping
Transport Mechanism: 3-beam suspension system
Laser Assembly: KSS-213C laser pickup
Loading Mechanism: Motor-driven tray system
Spindle Motor: Brushless DC servo motor
PCB Mounting: Main board and display board assembly
Front Panel: Display, controls, and infrared receiver
Rear Panel: Audio outputs and power input

Alignment Procedures

Factory alignment and adjustment procedures for optimal performance.

Required Equipment: Oscilloscope, test CD, digital multimeter, alignment jigs

RF Amplitude: Adjust for 1.2Vp-p at test point TP-RF. Focus Offset: Adjust for symmetrical eye pattern. Tracking Balance: Center tracking error signal. PLL Frequency: Set to 4.3218 MHz ±10Hz. Output Level: Calibrate for 2.0V RMS at 0dB recording.

Test Points & Measurements

Critical test points and expected measurement values.

Power up unit and allow stabilization
Verify all power supply voltages within ±5%
Check laser power with optical power meter
Monitor RF signal quality and amplitude
Verify servo lock and stability
Measure audio output characteristics

Tip: Use factory test CD for all audio performance measurements.

Troubleshooting Guide

Common failure symptoms and diagnostic procedures.

Symptom	Possible Cause	Corrective Action
No disc recognition	Laser failure/dirty lens	Clean lens; check laser power; replace pickup if necessary
Disc spins but no audio	DSP or D/A failure	Check digital signal path; verify clock signals; test D/A converter
Intermittent playback	Servo instability	Adjust focus/tracking gain; check power supply ripple
No display	Display driver or microprocessor	Check display voltages; verify microprocessor operation
Motor not spinning	Driver circuit or motor	Test motor directly; check driver IC voltages

WARNING! Laser radiation - do not view directly with optical instruments.

Parts List

Critical replacement components and part numbers.

PCB Layouts

Printed circuit board diagrams and component locations.

CAUTION! Use proper soldering techniques to avoid PCB damage.

Safety Precautions

Essential safety procedures for service personnel.

Always disconnect AC power before servicing. Use isolation transformer when testing live circuits. Observe ESD precautions with sensitive components. Replace safety-critical components with exact specifications. Verify all covers and shields are properly reinstalled.

Service Notes

Additional technical information and service tips.

Component	Service Note	Reference
Laser Pickup	KSS-213C replacement procedure	Section 5.2
Power Supply	Voltage regulation adjustment	Section 4.7
Servo IC	Gain adjustment points	Section 6.3
D/A Converter	Performance verification	Section 7.4
Microprocessor	Reset and initialization	Section 8.1

Service Support: Contact authorized Marantz service centers for technical assistance and genuine replacement parts.