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Hitachi HA-3700 Service Manual

Hitachi HA-3700
32 pages
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Hitachi HA-3700 Specifications

General IconGeneral
BrandHitachi
ModelHA-3700
CategoryAmplifier
LanguageEnglish

Summary

Technical Specifications

Disassembly and Replacement Procedures

Cover, Escutcheon, and Bottom Plate Removal

Procedure for removing the unit's outer casing and front escutcheon.

Power Transistor and Circuit Board Removal

Steps for removing power transistors and main circuit boards.

Adjustment and Calibration

Idle Current Adjustment

Setting quiescent current for optimal transistor bias.

Output DC Adjustment

Ensuring zero DC offset at speaker outputs for stability.

Super Linear Circuit Check

Verifying the integrity of the super linear circuit components.

Repair and Replacement Cautions

Important safety and handling guidelines for servicing the unit.

Key Circuit Descriptions

Super Linear Circuit Explanation

Detailed explanation of the super linear amplifier circuit operation.

LED Power Meter Drive Circuit

How the LED output level indicators are driven.

Equalizer Amplifier Circuit

Description of the low-noise equalizer circuit for MC/MM cartridges.

Protection Circuit Operation Check

ASO Detection Circuit Test

Verifying the Area of Safe Operation circuit's functionality.

Speaker Protection Circuit Test

Checking the relay operation for speaker protection.

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