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Marantz 2285 Service Manual

Marantz 2285
40 pages
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Marantz 2285 Specifications

General IconGeneral
Power Output85 watts per channel into 8Ω (stereo)
Total Harmonic Distortion0.1%
Damping Factor60
Input Sensitivity2.2mV (MM), 180mV (line)
Speaker Load Impedance4Ω to 16Ω
Tuning RangeFM, MW
Signal to Noise Ratio80dB (MM), 90dB (line)

Summary

Introduction to the Service Manual

Printed Wiring Boards Overview

Required Test Equipment for Servicing

AM Alignment Procedures

AM IF Alignment

Procedure for aligning the AM Intermediate Frequency stage.

AM Frequency Range and Tracking Alignment

Aligns AM tuner for optimal reception across frequency bands.

AM Signal Strength Meter Alignment

Calibrates the AM signal strength meter for accurate readings.

FM Alignment Procedures

FM Frequency Range and Tracking Alignment

Aligns FM tuner for optimal reception across frequency bands.

FM Stereo Separation Alignment

Optimizes stereo separation for FM broadcasts.

FM Muting Circuit Alignment

Aligns the FM muting circuit for proper operation.

Dolby FM Tape Output Setting

Sets the Dolby FM tape output levels for accurate playback.

Audio Adjustments

Main Amplifier DC Offset Alignment

Aligns the DC offset for the main amplifier channels.

Idle Current Adjustment

Adjusts the idle current for amplifier stages.

Phono Amplifier Adjustment

Adjusts phono amplifier clipping levels for optimal performance.

Voltage Conversion for European Models

Diagrams and Schematics

Interconnection Diagram

Shows how different circuit boards connect to each other.

Block Diagram

Provides a high-level overview of the receiver's functional blocks.

FM Front End Schematic and Component Locations

Schematic and layout for the FM front end circuitry.

AM Tuner Schematic and Component Locations

Schematic and layout for the AM tuner circuitry.

FM IF Schematic and Component Locations

Schematic and layout for the FM IF amplifier circuitry.

Multiplex Board Schematic and Component Locations

Schematic and layout for the MPX stereo decoder board.

Dolby Level Board Schematic and Component Locations

Schematic and layout for the Dolby level control board.

Phono Amplifier Schematic and Component Locations

Schematic and layout for the phono preamplifier circuit.

Main Amplifier Schematic and Component Locations

Schematic and layout for the main power amplifier circuit.

Power Supply Schematic and Component Locations

Schematic and layout for the power supply unit.

Pre and Tone Amplifier Schematic and Component Locations

Schematic and layout for the pre and tone control amplifier.

Dolby FM/Tape Monitor Schematic and Component Locations

Schematic and layout for Dolby FM and tape monitor functions.

Function Lamp Board Schematic and Component Locations

Schematic and layout for the function indicator lamps.

Dial Lamp Board Schematic and Component Locations

Schematic and layout for the dial illumination lamps.

Antenna Muting Board Schematic and Component Locations

Schematic and layout for the antenna muting circuit.

Filter Amplifier Board Schematic and Component Locations

Schematic and layout for the filter amplifier circuit.

Filter/Loudness Board Schematic and Component Locations

Schematic and layout for filter and loudness control circuits.

Major Component Locations

Cabinet Front View Component Locations

Identifies major components visible from the front of the unit.

Chassis Top View Component Locations

Identifies major components on the top of the chassis.

Cabinet Rear View Component Locations

Identifies major components visible from the rear of the unit.

Chassis Bottom View Component Locations

Identifies major components on the bottom of the chassis.

Cabinet Rear View (Europe) Component Locations

Identifies rear components for European model variants.

Chassis Bottom View (Europe) Component Locations

Identifies bottom chassis components for European model variants.

Exploded Views

Packing Material Exploded View

Illustrates the packaging components for shipping.

Mechanical Exploded View

Shows the assembly of mechanical parts of the receiver.

Parts List

Technical Specifications

Schematic Diagram

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