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Marantz 4230 Service Manual

Marantz 4230
38 pages
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Marantz 4230 Specifications

General IconGeneral
Total Harmonic Distortion0.3%
Damping Factor45
Input Sensitivity2.2mV (MM), 180mV (line)
Tuning RangeFM, MW
Power Output30 watts per channel into 8Ω (stereo)
Speaker Load Impedance4Ω to 16Ω
Semiconductors38 x transistors

Summary

Service Notes

AM Tuner

Suggestions for AM Tuner Trouble Shooting

Tips for troubleshooting issues with the AM tuner section of the receiver.

FM Tuner

Muting and Auto-Stereo Switching Circuits

Explains the muting circuit and auto-stereo switching for FM reception.

MPX Stereo Decoding Circuit

Details the MPX stereo decoding process and its components.

Suggestion for Trouble Shooting of FM Tuner

Provides guidance for troubleshooting common FM tuner issues.

Phono and Pre-Amplifier

Mode Switch

Describes the different mode settings for input signal processing.

Balance Control

Explains the balance control circuit and remote control function.

Dolby Unit

400Hz Tone

Dolby Switch

Dolby FM Usage

Usage of the Dolby switch for listening to Dolbyized FM broadcasts.

Playback Usage

Usage of the Dolby switch for playing back Dolbyized sources.

Record Modes

Settings for Record I and Record II operations.

Off Position

Effect of the Dolby switch in the 'Off' position, bypassing the circuit.

Control Adjustments and Calibration

Record Level & Play Cal.

Adjusts record level and playback calibration.

Dolby FM Preset Level

Governs FM output level to Dolby circuit.

400Hz Tone & FM De-Emphasis

Controls for 400Hz tone generation and FM de-emphasis.

Main Amplifier

BTL Connection

Power Supply Unit

Audio Trouble Analysis

Excessive line consumption

Troubleshooting step for excessive power draw.

No line consumption or zero bias

Troubleshooting for lack of power draw or zero bias.

Excessive hum and noise level

Troubleshooting for unwanted hum and noise in audio output.

Parastic oscillation

Troubleshooting guide for parasitic oscillations.

Improper clipping

Troubleshooting for audio clipping issues.

Test Equipment Required for Servicing

AM Alignment Procedure

AM IF Alignment

Procedure for aligning the AM Intermediate Frequency stages.

AM Frequency Range and Tracking Alignment

Procedure for aligning AM frequency range and tracking.

FM Alignment Procedure

Stereo Separation Alignment

Procedure for aligning FM stereo separation.

Muting Circuit Alignment

Procedure for aligning the FM muting circuit.

Audio Adjustment

Automatic Voltage Regulator Adjustment

Dolby Alignment Procedure

Procedure 1

Steps for Dolby alignment in Record I position.

Procedure 2

Steps for Dolby alignment in Record II position.

Procedure 3

Steps for Dolby level adjustment using 400Hz tone.

Dolby FM Preset Level Controls

Explanation of the Dolby Processing Chart

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