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Marantz 105B Service Manual

Marantz 105B
19 pages
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SERVICE
MANUAL
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Marantz 105B Specifications

General IconGeneral
BrandMarantz
Model105B
CategoryTuner
LanguageEnglish

Summary

Introduction to Marantz 105B Tuner

AM Tuner Description

Describes the AM signal path and detection process, including component functions.

AM Tuner Troubleshooting Suggestions

Provides guidance for diagnosing common AM tuner issues and checking signal strength.

FM Tuner Operation and Troubleshooting

FM Tuner Description

Details the FM signal path, amplification, mixer stages, and intermediate frequency.

Muting and Auto-Stereo Switching Circuits

Explains the solid-state muting and auto-stereo switching functionality based on signal strength.

MPX Stereo Decoding Circuit

Describes the stereo decoder IC and its role in channel separation and auto-stereo switching.

FM Tuner Troubleshooting Suggestions

Offers advice on troubleshooting FM reception, tuning meter issues, and stereo separation problems.

Alignment Procedures for AM and FM Tuners

AM IF Alignment

Step-by-step guide for aligning the AM Intermediate Frequency stages for optimal response.

AM Frequency Range and Tracking Alignment

Procedures for tuning AM frequency range and tracking adjustments for maximum audio output.

FM Alignment Procedures

Detailed steps for aligning the FM tuner, including oscillator, IF, and discriminator circuits.

Advanced Alignment and Servicing Equipment

Stereo Separation Alignment

Steps to align the stereo separation for optimal audio output and channel balance.

Muting Circuit Alignment

Procedure for adjusting the muting circuit threshold level to the specified sensitivity.

Test Equipment Required for Servicing

Lists the essential test equipment, including signal generators, oscilloscopes, and meters.

Parts List - Resistors

Parts List - Capacitors and Semiconductors

Parts List - Miscellaneous and Power Supply Components

Parts List - Hardware and Continued Resistors

Parts List - Packaging and Accessories

Technical Specifications

FM Section Specifications

Detailed performance metrics for the FM tuner, including sensitivity, selectivity, and distortion.

AM Section Specifications

Detailed performance metrics for the AM tuner, including sensitivity, selectivity, and frequency response.

General Specifications

Overall specifications for the unit, including power requirements, dimensions, and weight.

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