Hitachi HA-330 Service Manual

SERVICE MANUAL
SPECIFICATIONS
O utput
RMS power
(both channels
driven)
Power bandwidth
Fre qu ency chara cte r ist ic s
(AUX, T APE)
Harmonic distortion
(at rated ou tp ut )
(at 1 /2 rated output)
intermodulation d ist or t ion
40 watts per channel , min . RMS , at 8 ohms
from 20 Hz to 20 kHz, wit h no more than
0.3% total harmonic distortion.
50 W/ch + 50 W/ch
(8 ohms. 1 kHz, T.H.D.
0.3%)
50 W/ch + 50 W/ch
{4 oh ms, 1 kHz T.H.D .
0.3%)
10Hz 50kHz
20 Hz - 20 kHz (±1 dB)
L ess than 0.3%
Less than 0.02%
(at ra te d output) Less than 0.3%
(at 1 /2 rated output) Less than 0.04%
i nput sensiti vity (Impedance)
PHO NO 2.0 rnV (45 k-ohms)
AUX 120 mV (50 k-ohms)
T APE-1 120 mV (50 k-ohms)
TAPE -2 (DIN) 120 m V (50 k-ohm s)
Output l evel
T APE OUT
DIN OUT
120mV (PHONO , AUX,
TUNER)
40mV
(PHO NO at rated in put)
English
Deutsch
Fran9ais
Phono over load level
(at 1 kHz, T.H.D. 0.3%)
Signal-
to -no ise ratio
(IHF . A n etwork)
PHO NO
AUX, TUNER, TAPE
Damping facto r
Equa lizer
Ba ss control
Treble c on trol
Loudness control
Semi-conductors
Power supply
Power con s um p ti on
Di mensions
Weight
No. 115
15 0mV
75 dB
90 dB
40 { 1k H z,8 ohm s)
RIAA ±0.3 dB
±8 dB {100 He)
±8 dB ( 10 k Hl )
+6 dB (100 Hl)
+4dB ( iOkHl)
1 IC, 24 transistors and
18 diodes
AC120V60Hz or
-120 V/220 V/240 V
50/60 Hz
160W (at 1 /3 r ated output )
260 W (at rated outp ut)
390 (W) x 143 {H ) x
330 (D) mm
7.8 kg
Specifications and designs may be changed v1 ith out notic e
for impro v ement .
STEREO AMPLIFIER
June1977

Hitachi HA-330 Specifications

General

Brand	Hitachi
Model	HA-330
Category	Amplifier
Language	English

Summary

Audio Amplifier Specifications

Disassembly and Replacement Procedures

Removing External Panels

Instructions for removing the top cover, front panel, and bottom plate.

Removing Internal Circuit Boards

Procedure for removing the equalizer, pre tone, and audio printed wiring boards.

Adjustment Procedures

Idle Current Adjustment

Procedure for setting the idle current using VR701 for optimal bias.

New Circuit Features and Descriptions

Muting Circuit Functionality

Explains the muting relay for preventing click noise during power-on.

DC Speaker Protection Circuit

Monitors speaker outputs for DC voltage to prevent speaker damage.

ASO Output Transistor Protection

Details the ASO circuit's role in protecting output transistors Q706 and Q707.

Printed Wiring Board Layout

Audio Circuit Board Component Layout

Diagram showing the component placement on the audio printed wiring board.

Circuit Diagrams and Block Overview

Functional Block Diagram and Schematics

Provides an overview of the amplifier's functional blocks and detailed circuit schematics.

Protection Circuit Operation and Troubleshooting

Output Transistor Protection (ASO) Details

Explains the ASO circuit's operation for output transistor protection.

Speaker Protection Circuit Causes and Remedies

Details the speaker protection circuit's triggers and corrective actions.

Replacement Parts List

Capacitors and Resistors for Replacement

Lists replacement capacitors and resistors with stock and part numbers.

Transistors, Diodes, and ICs for Replacement

Lists replacement transistors, diodes, and integrated circuits with part numbers.

Variable Resistors and Coils for Replacement

Lists replacement variable resistors and coils with part numbers.

Front and Rear Panel Controls