Marantz PM 6002 Service Manual

The Marantz PM 6002 is a high-quality stereo integrated amplifier featuring 45 watts per channel, high-current power supply, discrete power amplifier stage, toroidal transformer, gold-plated input terminals, MM phono input, tone controls, source direct mode, and remote control capability. Below are key sections for technical specifications, block diagrams, circuit descriptions, adjustment procedures, parts list, and troubleshooting.

1. Technical Specifications 2. Block Diagrams 3. Circuit Descriptions 4. Adjustment Procedures 5. Parts List 6. PCB Layouts 7. Wiring Diagrams 8. Troubleshooting Guide 9. Safety Precautions

Technical Specifications

Key technical parameters and performance characteristics of the Marantz PM 6002 amplifier.

Parameter	Specification
Power Output	45W + 45W (8Ω, 20Hz-20kHz, 0.08% THD)
Total Harmonic Distortion	0.08% (20Hz-20kHz at 45W)
Frequency Response	10Hz-50kHz (+0/-3dB)
Input Sensitivity	200mV (LINE), 2.5mV (PHONO MM)
Signal-to-Noise Ratio	100dB (LINE), 87dB (PHONO)
Damping Factor	100 (8Ω, 1kHz)
Power Supply	Toroidal transformer, 25,000μF capacitors
Dimensions	440 x 115 x 370mm (W x H x D)
Weight	8.5kg
Power Consumption	230W (maximum)

Block Diagrams

System block diagrams showing signal flow and power distribution.

Main System Block Diagram: Shows overall signal path from inputs to outputs.
Power Supply Block Diagram: Illustrates AC input, transformer, rectification, and regulation.
Amplifier Section Block Diagram: Details preamplifier, tone control, and power amplifier stages.
Protection Circuit Block Diagram: Shows speaker protection and thermal protection circuits.

NOTE! Refer to actual service manual for detailed schematic diagrams.

Circuit Descriptions

Detailed explanation of major circuit sections and their operation.

Power Supply Circuit: Toroidal transformer with dual secondary windings, bridge rectifiers, and large filter capacitors.
Preamplifier Circuit: High-quality op-amps for voltage amplification with low noise design.
Tone Control Circuit: Bass and treble controls with defeat switch for source direct mode.
Power Amplifier Circuit: Discrete complementary symmetry output stage with current mirror load.
Protection Circuit: DC detection, overcurrent protection, and thermal shutdown.

CAUTION! High voltages present - discharge capacitors before servicing.

Adjustment Procedures

Factory adjustment procedures for optimal performance.

DC Offset Adjustment: Adjust VR801/VR802 for 0mV ±5mV at speaker terminals.
Bias Current Adjustment: Set VR803/VR804 for 10mV across emitter resistors.
Phono Equalization: Verify RIAA curve accuracy with test equipment.
Input Level Matching: Adjust input sensitivity for consistent volume levels.

Parts List

Complete list of components with manufacturer part numbers.

Component	Part Number	Description
Main Transformer	TP-5001	Toroidal, 250VA
Main Capacitors	CE-8201/8202	12,500μF 63V x 2
Output Transistors	2SC5200/2SA1943	NPN/PNP power transistors
Power IC	STK-4102	Power amplifier hybrid IC
Relay	RY-1201	Speaker protection relay
Volume Control	VR-1001	ALPS motorized potentiometer

PCB Layouts

Printed circuit board layouts and component placement diagrams.

Main Amplifier Board: Component side and solder side views with reference designators.
Power Supply Board: Layout showing power transistors and large capacitors.
Front Panel Board: Control switches, indicators, and input selectors.
Protection Circuit Board: Relay and protection IC layout.

Tip: Use magnifying glass for identifying small component designators.

Wiring Diagrams

Internal wiring connections and external interface diagrams.

Internal Wiring: Connections between main boards, transformers, and front panel.
Input/Output Connections: RCA jacks, speaker terminals, and AC inlet wiring.
Remote Control Wiring: IR receiver and motorized volume control connections.
Grounding Scheme: Star grounding system for minimal hum and noise.

WARNING! Ensure proper grounding to prevent electric shock.

Troubleshooting Guide

Common problems and their solutions for the PM 6002 amplifier.

Symptom	Possible Cause	Corrective Action
No power	Fuse blown, power switch	Check main fuse F801; verify power switch operation.
No sound	Protection circuit, speaker relay	Check DC offset; verify relay RY1201 operation.
Distorted sound	Bias current, output transistors	Adjust bias current VR803/804; check output transistors.
Hum noise	Grounding, capacitors	Verify ground connections; check filter capacitors.
One channel dead	Input selector, volume control	Check input selector switch; verify volume control operation.

Safety Precautions

Important safety information for service technicians.

WARNING! High voltages present - always disconnect AC power before servicing. Discharge large capacitors. Use isolation transformer when testing live circuits. Replace safety components only with specified parts.

Service Information: For technical support contact Marantz service department or authorized service centers.