Marantz SA8004 Service Manual

The Marantz SA8004 is a high-performance Super Audio CD player featuring advanced digital-to-analog conversion technology, high-current discrete output stages, custom-designed components, and Marantz's proprietary HDAM (Hyper Dynamic Amplifier Module) circuitry. This service manual provides comprehensive technical information for qualified service technicians, including schematics, alignment procedures, parts lists, and troubleshooting guidelines for the SA8004 SACD/CD player.

1. Technical Specifications 2. Block Diagrams 3. Circuit Descriptions 4. Disassembly Procedures 5. Alignment and Adjustment 6. PCB Layouts 7. Schematic Diagrams 8. Parts List 9. Troubleshooting Guide 10. Safety Precautions 11. Service Notes

Technical Specifications

Detailed technical specifications for the Marantz SA8004 Super Audio CD player.

Parameter	Specification
Disc Compatibility	SACD, CD, CD-R/RW, MP3, WMA
Frequency Response	2Hz - 50kHz (SACD), 2Hz - 20kHz (CD)
Signal-to-Noise Ratio	115dB (SACD), 110dB (CD)
Dynamic Range	110dB (SACD), 100dB (CD)
Total Harmonic Distortion	0.0015% (SACD), 0.002% (CD)
Output Voltage	2.5V RMS
Digital Output	Coaxial, Optical (CD layer only)
Power Consumption	25W
Dimensions	440 x 107 x 365mm (W x H x D)
Weight	10.5kg

Block Diagrams

System block diagrams showing signal flow and major functional blocks.

Main System Block Diagram: Shows overall signal path from disc pickup to audio outputs.
Digital Processing Block: Details DSD and PCM processing paths.
Power Supply Block: Illustrates voltage regulation and distribution.
Control System Block: Microprocessor and user interface connections.
Audio Output Block: HDAM circuits and analog output stages.

WARNING! Service should only be performed by qualified technicians familiar with high-voltage electronics.

Circuit Descriptions

Detailed descriptions of major circuit sections and their operation.

Laser Pickup System: SACD/CD compatible optical mechanism.
Digital Servo Circuit: Focus, tracking, and spindle control systems.
DSD Decoder: SACD stream processing and conversion.
DAC Circuit: High-performance digital-to-analog conversion.
HDAM Output Stage: Discrete analog amplification circuitry.
Power Supply: Multi-voltage regulated power system.
Microprocessor Control: System management and user interface.

CAUTION! Static-sensitive components require proper ESD protection during service.

Disassembly Procedures

Top Cover Removal: Remove 6 screws from rear and sides.
Front Panel Removal: Disconnect ribbon cables carefully.
Main PCB Access: Remove mounting screws and grounding straps.
Transport Mechanism: Unplug connectors and remove mounting screws.
Power Supply Board: Discharge capacitors before handling.
Output Board: Access HDAM circuits and analog stages.

Alignment and Adjustment

Factory alignment procedures and test point locations.

Laser Power Adjustment: TP1 for RF level, adjust VR101 for optimal signal.

Focus/Tracking Bias: Monitor test points TP2-TP5, adjust VR102-VR105.

Output Level Calibration: 1kHz test signal, adjust VR201 for 2.5V RMS.

Clock Adjustment: Frequency counter on X101, adjust C101 for 33.8688MHz.

Required Test Equipment: Oscilloscope, DMM, Audio analyzer, SACD test disc.

PCB Layouts

Printed circuit board layouts and component locations.

Main PCB: Component side and solder side views.
Power Supply PCB: Voltage regulator locations.
Front Panel PCB: Display and control circuits.
Output PCB: HDAM and analog output stages.
Transport PCB: Servo and drive circuits.

Tip: Use magnifying glass for component identification and solder inspection.

Schematic Diagrams

Complete schematic diagrams for all circuit sections.

Power Supply Section: AC input to DC outputs.
Digital Processing: DSD/PCM decoding circuits.
Servo Control: Focus, tracking, and spindle motors.
Audio Output: HDAM and analog stages.
Control System: Microprocessor and interfaces.
Display Circuit: Front panel indicators and controls.

WARNING! High voltages present in power supply section - exercise extreme caution.

Parts List

Complete component listing with manufacturer part numbers.

Component	Part Number	Description
Laser Pickup	KHS-180A	SACD/CD compatible optical assembly
Main IC	MN102H675G	System control microprocessor
DAC IC	CS4398	High-performance stereo DAC
Power Transformer	T001	Multi-secondary power transformer
Transport Motor	MF34T-032	Disc loading mechanism motor
Main Capacitor	6800μF/35V	Primary filter capacitor
Output Transistors	2SC2240/2SA970	HDAM circuit complementary pair

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
No power	Fuse, power supply	Check F001 (2A), measure DC outputs, test regulator ICs.
No disc recognition	Laser, servo circuit	Check laser emission, focus/tracking servos, RF signal.
No audio output	DAC, output stage	Verify DAC operation, test HDAM circuits, check output relays.
Intermittent operation	Connectors, solder joints	Inspect all connectors, resolder suspect joints, check grounding.
Display issues	Front panel PCB	Test display drivers, check ribbon cables, verify +5V supply.

Reset Procedure: Power cycle unit, check for firmware updates.

Safety Precautions

Essential safety procedures for service technicians.

CAUTION! Always disconnect AC power before servicing. Discharge large capacitors. Use isolation transformer when testing live circuits. Follow ESD protection procedures for CMOS devices.

Service Notes

Additional technical information and service tips.

Firmware Version: Check system information in service mode.
Test Mode Access: Power on while holding STOP and PLAY buttons.
Laser Replacement: Requires power adjustment and alignment.
Warranty Service: Use genuine Marantz parts for all repairs.
Technical Support: Contact Marantz service department for complex issues.

For technical assistance: Marantz Service Department - [email protected]