Hitachi HCA-8500Mk2 User Manual

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Hitachi HCA-8500Mk2 Specifications

General

Brand	Hitachi
Model	HCA-8500Mk2
Category	Amplifier
Language	English

Summary

Safety Precautions

General Safety Precautions

Observe safety-related characteristics and use genuine Hitachi replacement parts for critical components.

Specifications

Service Points

Audio PWB Connectors

Check and correctly connect audio printed wiring board connectors.

Parts Installation Method

Direct Coupling & Subsonic Filter

FETs for DC Servo

DC Voltage Measurement Caution

Adjustments

Equalizer DC Output Adjustment

Adjust R433L/R for zero DC output on equalizer amplifier.

Tone Amplifier DC Output Adjustment

Adjust R637L/R for zero DC output on tone amplifier.

Circuit Diagram

Troubleshooting

Appearance and Operation Checks

Perform visual checks and operational tests for fault diagnosis.

Semi-conductor Checks

Check all semi-conductors in the malfunctioning channel for faults.

Disassembly and Replacement

Disassembly Procedures

Replacement Parts List

Safety Check: Insulation Resistance