Hitachi HGE 77 Service Manual

Page 1

@HITACHI

' SERVICE MANUAL

A

TV No. 551 EGF

HGE-77

(us, cs, BS, VK, 25, EW)

CONTENTS
SPECIFICATIONS ................ TECHNISCHEN DATEN ....
DISASSEMBLY ............. DEMONTAGE
PRINTED WIRING BOARD PRINTPLATTEN
CIRCUIT DIAGRAM SCHALTPLAN
BLOCK DIAGRAM BLOCKSHEMA
EXPLODED VIEW EXPLOSIONSANSICHT
REPLACEMENT PARTS LIST ERSATZTEILLISTE

INHALTSVERZEICHNIS

TABLE DES MATIERES
CARACTERISTIQUESTECHNIQUES .............. 2

2

3 DEMONTAGE
5 PLAN DE BASE .
7 PLAN DE CIRCUIT
9

0

1

SCHEMA ...........
VUE EXPLOSEE ..........
TABELEAU DES PIECES

dowumw

SAFETY PRECAUTIONS

The following precautions should be observed when servicing.

1. Since many parts in the unit have special safety-related characteristics, always use genuine Hitachi
replacement parts. Especially critical parts in the power circuit block should not be replaced with other makers.
Critical parts are marked with A in the circuit diagram and printed wiring board.

2. Before returning a repaired unit to the costomer, the service technician must thoroughly test the unit to
ascertain that it is completely safe to operate without danger of electrical shock.

SPEC/FICA TIONS
Input Sensitivity/ impedance
INPUT: 200mV/45 kohms
TAPE PLAY: 200mV/45 kohms
Output level/impedance
OUTPUT: 200mV/1 kohms

TAPE REC: 200mV/1 kohms
Power output: 3V (T.H,D, 0.1 %)
Total harmonic distortion: 0.05% (20 Hz~20 kHz Output sensitivity)
Gain: 0 dB
Frequency response: 10-20 kHz :1 dB

Signal-tn-noise ratio:
Equalizer center frequencies:

96 dB (for rated output, IHF A networkl

10 elements 31.5 Hz, 63 Hz, 125 Hz, 250 Hz
500 Hz,1kHz, 2 kHz, 4 kHz, 8 kHz, 16 kHz

left, right independent i1!) dB

~120V, 60 Hz (for US), ~240V, 50 Hz (for BK)
~220V, 50 H2 "or VK, ZS). ~110V/220V/240V,
50/60 Hz (for EW)

Variable range of adjustment:
Power supply voltage:

* All value given in this specification refer to equalizer in the "flat" condition.

Power consumption: 15W

Dimensions: 370(W) X 85iH) X 276(0) mm
400(W) x 85(H) x 276(0) mm (With included
side wood panels)
Weight: 3.3 kg
3.7 kg (With included side wood panels)
Accessories
Side wood

Side wood Installing screw
Side wood installing washer
Side wood installing flat spring washe
Connecting pin cord ..................

Mbbhm

For the purpose of improvement, design and specification are subject to change without notice.

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

GRAPHIC EQUALIZER

April 1987

TOYO KAWA WORKS