Marantz PM6010OSE Service Manual

The Marantz PM6010OSE is a high-quality stereo integrated amplifier featuring 60 watts per channel, MM phono input, CD direct input, tone controls, loudness compensation, headphone output, and remote control capability. This service manual provides comprehensive technical information for service technicians, including schematics, alignment procedures, and troubleshooting guidelines.

1. Technical Specifications 2. Block Diagram 3. Circuit Description 4. Disassembly Instructions 5. Alignment Procedures 6. Schematic Diagrams 7. Parts List 8. PCB Layouts 9. Test Points & Voltages 10. Troubleshooting Guide

Technical Specifications

Complete technical specifications for the Marantz PM6010OSE integrated amplifier.

Parameter	Specification
Power Output	60W + 60W (8Ω, 20Hz-20kHz, 0.02% THD)
Total Harmonic Distortion	0.02% (20Hz-20kHz at rated output)
Frequency Response	5Hz-50kHz (+0/-3dB)
Input Sensitivity	Phono MM: 2.5mV; CD: 150mV
Signal-to-Noise Ratio	Phono: 85dB; CD: 100dB
Input Impedance	Phono: 47kΩ; CD: 20kΩ
Tone Control	Bass: ±10dB at 100Hz; Treble: ±10dB at 10kHz
Power Consumption	240W maximum
Dimensions	440 x 125 x 355mm (W x H x D)
Weight	7.5kg

Block Diagram

System overview showing signal flow and major functional blocks.

Input Selector: CD, Tuner, Phono, Tape 1, Tape 2
Phono Equalizer: RIAA equalization for MM cartridges
Tone Control: Bass and treble adjustment circuits
Volume Control: ALPS motorized potentiometer
Power Amplifier: Complementary symmetry output stage
Protection Circuit: DC detection and thermal protection
Power Supply: Toroidal transformer with regulated supplies

NOTE: Refer to schematic diagrams for detailed circuit information.

Circuit Description

Detailed explanation of major circuit sections and their operation.

Power Supply: Toroidal transformer with dual secondary windings, bridge rectifiers, and large filter capacitors
Input Stage: JFET input circuitry for high impedance and low noise
Phono Stage: Discrete MM phono amplifier with precise RIAA equalization
Tone Control: Baxandall-type tone control with defeat switch
Power Amplifier: Complementary Darlington output transistors with current mirror load
Protection: Relay-based speaker protection with DC offset detection

CAUTION! High voltages present - discharge capacitors before servicing.

Disassembly Instructions

Step-by-step guide for safe disassembly of the amplifier.

Remove top cover: Unscrew 6 Phillips screws on top panel
Remove bottom cover: Unscrew 4 screws on bottom panel
Front panel removal: Remove knobs and unscrew front panel screws
Main board access: Disconnect wiring harnesses and remove board mounting screws
Power supply access: Disconnect transformer leads and remove mounting hardware

WARNING! Always disconnect power and discharge capacitors before disassembly.

Alignment Procedures

Factory adjustment procedures for optimal performance.

DC Offset Adjustment: Adjust VR801/VR802 for 0mV ±5mV at speaker terminals
Bias Current Adjustment: Adjust VR803/VR804 for 15mA across emitter resistors
Phono Stage Gain: Verify 40dB gain at 1kHz with standard test record
Tone Control Center: Adjust for flat response with tone defeat engaged

Schematic Diagrams

Complete circuit schematics for all amplifier sections.

Main Amplifier Circuit: Power amplifier and driver stages
Power Supply: Transformer, rectification, and filtering
Phono Equalizer: MM phono input with RIAA equalization
Control Circuit: Input selection, tone control, and volume
Protection Circuit: Speaker protection and thermal sensing

Note: Schematics show component values, test points, and voltage references.

Parts List

Complete component listing with manufacturer part numbers.

Reference	Description	Value	Part Number
Q701-Q704	Output Transistor	2SC3281/2SA1302	MAR-3281-1302
C601,C602	Main Filter Cap	10000μF/63V	MAR-10000-63
IC701	Op-Amp	NJM4558	MAR-4558
VR801-VR804	Adjustment Pot	500Ω	MAR-500-POT
F701	Main Fuse	4A/250V	MAR-FUSE-4A

PCB Layouts

Printed circuit board layouts showing component placement and traces.

Main Amplifier Board: Component side and solder side views
Power Supply Board: Component placement and power traces
Control Board: Input selector and tone control circuitry
Front Panel Board: Display and control interface

Tip: Use layouts for component identification and trace routing during repairs.

Test Points & Voltages

Key test points and expected voltage measurements.

Test Point	Description	Expected Voltage
TP1	+B Supply	+45V DC ±2V
TP2	-B Supply	-45V DC ±2V
TP3	+15V Regulated	+15V DC ±0.5V
TP4	-15V Regulated	-15V DC ±0.5V
TP5	Speaker Output	0V DC ±5mV

Troubleshooting Guide

Common problems and solutions for the PM6010OSE amplifier.

Symptom	Possible Cause	Corrective Action
No sound output	Protection relay, blown fuse	Check speaker relay operation; verify fuse F701
Distorted sound	Bias current, DC offset	Adjust bias current and DC offset per alignment procedure
Hum in output	Ground loop, filter caps	Check ground connections; test main filter capacitors
One channel dead	Output transistors, driver stage	Test output transistors Q701-Q704; check driver stage
No phono input	Phono stage components	Verify phono stage voltages; test transistors and capacitors

Service Note: Always use isolation transformer when servicing live circuits.

Technical Support: Contact Marantz service department for additional assistance.