Hitachi HMA-8300 Service Manual

SERVICE MANUAL
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SPECIFICATIONS
NO. 117
Circuitry
Peak RMS power (Music power)
Continuous RMS power output
Harmonic distortion
(at rated output)
(at 100 W output)
(at 1 W output)
Power bandwidth (IHF)
Frequency characteristics
Input sensitivity
Damping factor
Channel separation
Signal-to-noise ratio
(IHF, A network)
Speaker impedance
Semi-conductors
Power supply
Power consumption
Dimensions
Weight
A Newly Developed High Efficiency High Power Audio Amplifier
(Named series E Amplifier)
400 W/ch + 400 W/ch (8 ohms)
200 watts per channel min. RMS,
at 8 ohms from 20 Hz to 20 kHz,
with no more than 0.1% total harmonic distortion
200 W/ch + 200 W/ch (4 ohms, 1 kHz, T.H.D. 0.1%)
Less than 0.1%
Less than 0.05%
Less than 0.05%
5 Hz - 30 kHz (8 ohms)
5 Hz -80 kHz (t? dB)
1 V (50 k ohms)
50 (20 Hz — 20 kHz, 8 ohms)
100 (1 kHz, 8 ohms)
80 dB (1 kHz, 8 ohms)
110 dB
4-16 ohms (except for Switzerland, U.K. & Sweden)
8—16 ohms (for Switzerland, U.K. & Sweden)
2 ICs, 40 transistors and 51 diodes
AC 120 V, -220 - 240 V, 50/60 Hz
850 W or 1020 VA (AC 120 V)
1470 W (-220-240 V, 4 ohms)
1100 W (- 220 - 240 V. 8 ohms)
435 (W) X 182 (H) x 404 (D) mm
17-1/8 (W) x 7-3/16 (H) x 16 (D) in.
24 kg
53 lbs.
Specifications and designs may be changed without notice for improvement.
STEREO POWER AMPLIFIER
June1977
For original manual click
here

Hitachi HMA-8300 Specifications

General

Brand	Hitachi
Model	HMA-8300
Category	Amplifier
Language	English

Summary

Equipment Specifications

Performance Specifications Overview

Covers power output, distortion, frequency response, input sensitivity, damping factor, channel separation, and S/N ratio.

Power Supply, Components, Dimensions, and Weight

Details on power supply, consumption, semiconductors, dimensions, and weight.

Disassembly and Replacement Procedures

Removing Unit Covers and Plates

Procedures for removing the upper, side, and bottom plates.

Removing Meters and Power Transistors

Step-by-step instructions for removing meters and power transistors.

Adjustment Procedures

Adjusting Amplifier Idle Current

Procedure to set the quiescent current for optimal performance.

Meter Zero and Sensitivity Adjustment

Steps for calibrating the power meter's zero point and sensitivity.

Circuitry Description

Dynaharmony Output Stage Explanation

Description of the Series E Amplifier's output circuit.

Current Mirror and Constant Current Circuitry

Explains current mirror for low distortion and constant current for bias stabilization.

Idle Current Compensation Against Voltage Fluctuations

Circuit that stabilizes idle current during power supply variations.

Protection and Meter Circuits

Amplifier Protection Circuitry

Details on muting, ASO, and speaker protection circuits.

Power Meter Circuit Description

Explanation of the logarithmic compression circuit for the power meter.

Checking Protection Circuit Operation

Checking ASO Output Transistor Protection

Procedure to verify the ASO detection circuit's functionality.

Checking Speaker Protection Relay Operation

Procedure to confirm the speaker protection circuit and relay.

Front and Rear Panel Layout

Front and Rear Panel Controls and Indicators

Identification of controls and indicators on the front and rear panels.

Amplifier Key Features Overview

Summary of the amplifier's main features and capabilities.