Marantz 5010B Service Manual

The Marantz 5010B is a professional-grade audio amplifier featuring high-fidelity stereo sound reproduction, robust construction, and advanced thermal management. This service manual provides comprehensive technical documentation for installation, operation, maintenance, and troubleshooting of the amplifier unit. Below are key sections covering specifications, installation procedures, operational guidelines, and service information.

1. Technical Specifications 2. Installation Procedures 3. Front Panel Controls 4. Rear Panel Connections 5. Operation Guidelines 6. Circuit Description 7. Maintenance Procedures 8. Troubleshooting Guide 9. Parts List 10. Schematics 11. Safety Information

Technical Specifications

Detailed technical specifications and performance characteristics of the Marantz 5010B amplifier.

Parameter	Specification
Power Output	100W RMS per channel (8Ω)
Frequency Response	20Hz - 20kHz (±0.5dB)
Total Harmonic Distortion	<0.05% at rated power
Signal-to-Noise Ratio	>95dB (A-weighted)
Input Sensitivity	1V for rated output
Input Impedance	47kΩ
Damping Factor	>200 at 8Ω
Power Requirements	120V AC, 60Hz, 500W max
Dimensions	17" W × 5.5" H × 15" D
Weight	28 lbs (12.7 kg)

Installation Procedures

Proper installation guidelines to ensure optimal performance and safety.

Unpack and inspect unit for shipping damage.
Place on stable, level surface with adequate ventilation.
Connect speaker wires to binding posts observing polarity.
Connect audio source components to appropriate inputs.
Connect power cord to grounded AC outlet.

WARNING! Ensure proper ventilation space around amplifier (minimum 4 inches on all sides). Do not block ventilation slots.

Front Panel Controls

Description and function of all front panel controls and indicators.

Control/Indicator	Function
POWER Switch	Main power on/off control
Volume Control	Master volume adjustment
Input Selector	Selects between multiple audio sources
Power Indicator	LED indicates power status (green=on, red=protect)
Protection Indicator	LED indicates fault condition
Balance Control	Adjusts left/right channel balance
Bass/Treble Controls	Tone adjustment controls

Rear Panel Connections

Detailed description of all rear panel input/output connections.

Speaker Outputs: Heavy-duty binding posts for 4-16Ω speakers
Line Inputs: RCA jacks for CD, AUX, TUNER sources
Tape Monitor: Input/output for tape deck connection
Preamp Output: Fixed-level output for external amplification
AC Power Input: Standard IEC power connector
Ground Terminal: For turntable ground connection

CAUTION! Always power off amplifier before making or changing connections.

Operation Guidelines

Proper operating procedures for optimal performance and longevity.

Turn volume to minimum before powering on.
Select appropriate input source.
Adjust volume gradually to desired listening level.
Allow 30 minutes warm-up for optimal performance.
Turn volume to minimum before powering off.

Note: Avoid operating at maximum volume for extended periods to prevent thermal overload.

Circuit Description

Detailed technical description of amplifier circuitry and operation.

Power Supply: Toroidal transformer with dual secondary windings
Amplifier Stage: Complementary symmetry output configuration
Protection Circuitry: DC offset, thermal, and short-circuit protection
Preamp Section: Low-noise op-amp based design
Tone Control: Active bass and treble control circuits

Maintenance Procedures

Routine maintenance and inspection procedures.

Monthly: Clean exterior with dry, soft cloth
Quarterly: Check and clean ventilation openings
Annually: Internal inspection for dust accumulation
As needed: De-oxidize input/output connectors

WARNING! Disconnect power before performing any internal maintenance. Internal service should only be performed by qualified technicians.

Troubleshooting Guide

Common problems and their solutions.

Symptom	Possible Cause	Corrective Action
No power	Power cord, fuse, outlet	Check power cord connection; verify outlet function; check main fuse
Protection mode	Speaker short, DC offset	Check speaker wiring for shorts; measure DC offset at outputs
Distorted audio	Overload, faulty component	Reduce volume level; check input signal level; test components
Intermittent operation	Loose connections, thermal	Check all internal/external connections; verify cooling operation
Hum/buzz	Ground loop, cable issues	Check ground connections; use shielded cables; separate power/audio cables

Parts List

Complete list of replacement parts and components.

Part Number	Description	Qty
MZ-5010B-PSU	Power Supply Assembly	1
MZ-5010B-AMP	Amplifier Module	2
MZ-5010B-PRE	Preamplifier Board	1
MZ-FUSE-5A	5A Slow-Blow Fuse	2
MZ-KNOB-VOL	Volume Control Knob	1
MZ-LED-PWR	Power Indicator LED	1

Schematics

Complete circuit diagrams and block diagrams.

Main Amplifier Schematic
Power Supply Schematic
Preamplifier Schematic
Protection Circuit Schematic
Front Panel Control Schematic
Overall Block Diagram

Note: Schematics are available in separate documentation package or from authorized service centers.

Safety Information

Important safety precautions and regulatory compliance information.

Disconnect power before servicing
Use only specified replacement parts
Observe electrostatic discharge precautions
Complies with UL, CSA, and CE safety standards
Proper grounding essential for safe operation

WARNING! High voltages present inside chassis. Capacitors may retain charge after power disconnect. Allow sufficient discharge time before servicing.