Marantz 250 Service Manual

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Marantz 250 Specifications

General

Brand	Marantz
Model	250
Category	Amplifier
Language	English

Summary

Introduction to the Service Manual

Circuit Description Overview

Amplifier Circuit Details

Details the input stage, differential amplifier, and pre-drivers of the power amplifier.

Rectifier-Relay Board Functionality

Meter Operation and Description

AC Voltage Conversion (100/220V)

Technical Specifications Summary

100-Volt AC Conversion Procedure

Required Test Equipment for Servicing

Performance Verification Procedures

General Test Procedure Setup

Describes the step-by-step process for performance verification.

DC Balance Adjustment and Test

Procedure to check and adjust the DC balance of the amplifier.

Total Hum and Noise Measurement

Method for measuring the total hum and noise level of the amplifier.

Bias and Output Adjustment Tests

Steps for adjusting potentiometers for proper amplifier biasing and operation.

Maximum Power Output Testing

Relay Operation Verification

Harmonic Distortion Measurement

Output Short Circuit Test

Frequency Response Measurement

Front Panel Meter Calibration

Troubleshooting Common Issues

Troubleshooting Symptoms

Lists common symptoms observed in the amplifier.

Troubleshooting Procedures

Outlines the recommended steps to troubleshoot each identified symptom.

Component Parts List