Hitachi SR-804 Service Manual

HITACHI
SERVICE MANUAL
English N 152
Deutsch O.
Francais ae Europe, U.K., Australia, Asia
rang & Latin American countries
FEATURES
Audio Section
1.
oonw ooh wh
Newly Developed High-Efficiency High-Power
Audio Amplifier (Dynaharmony Amplifier)
. All-stage Direct-connection OCL Amplifier
. Electronic Protection Circuit
. New [Cs in the Equalizer and Pre-amplifier
. Separate Type Power Meters (L and R Channels}
. Tape Dubbing
. Two Speaker Systems Connection
. Coaxial Type VOLUME and BALANCE Control
. A Low Filter and a High Filter
MERKMALE
Audio-Abschnitt
1.
2.
3.
. Neue integrierte Schaltung im Entzerrer und
I OD
. Getrennte Leistungspegel-Anzeigen
Neuentwickelter Hochleistungs- Audioverstarker
(Dynaharmony Verstarker)
Vollstufiger, direkt gekoppelter OCL-Verstarker
Elektronikschutzschaltung
Vorverstarker
(L und R
Kanal)
. Bandaufnahme vom Original
. Anschlu& fiir zwei Boxenpaare
. Koaxiale Lautstarke-(VOLUME) und BALANCE-
Regler
. Tiefen-und Hohenfilter
Tuner Section
1. Dual Gate MOS FET for High Quality FM Tuner
2. High Selectivity and Low Distortion IF Amplifier
Using IC and 3 Ceramic Filters
3. Quadrature Detection
4, Phase-Locked Loop for FM/MPX Circuit
5. A Ceramic Filter, IC in AM Tuner
6. Two Large Easy-to-read Meters and a Large-
sized Fly-wheel Tuning Knob
Rundfunkempfangsteil
1. Doppelsteuer-MOS-FET fiir den hochwertigen
UKW-Tuner
2.
ZF-Verstarker
mit
groRer
Selektivitat
und
geringem
_ Klirrfaktor, der mit ICs und 3 Keramikfiltern
bestiickt ist.
3. Phasenschieberkreis
4. Phasenstarre Schleife fiir die UKW/MPX-Schaltung
5. Keramikfilter, integrierte Schaltung im Tuner
6. Zwei groBe, gut ablesbare Me8instrumente und
groRdimensionierter Schwungrad-Abstimmknopf
STEREO RECEIVER
September
)
978

Hitachi SR-804 Specifications

General

Brand	Hitachi
Model	SR-804
Category	Stereo Receiver
Language	English

Summary

FEATURES

Audio Section

Key features of the audio amplifier section.

Tuner Section

Key features of the FM/AM tuner section.

IMPORTANT NOTICES

DISASSEMBLY AND REPLACEMENT

DIAL CORD SETTING

GENERAL ALIGNMENT INSTRUCTION

FM TUNER ALIGNMENT

CAUTION

AM TUNER ALIGNMENT

AUDIO CIRCUIT ALIGNMENT

METER ADJUSTMENT

Meter Sensitivity Adjustment

Procedure to adjust meter sensitivity and needle deviation.

DESCRIPTION OF THE NEW CIRCUIT

Muting Circuit

Circuit to eliminate clicking noise during power on.

Area of Safety Operation Detection

Circuit to protect output transistors from damage.

PRINTED WIRING BOARD PLAN DE BASE

REPLACEMENT PARTS LIST

SPECIFICATIONS

FM Section

Technical specifications for the FM tuner.

AM Section

Technical specifications for the AM tuner.

Audio Section

Technical specifications for the audio amplifier.

FRONT AND REAR PANEL

BLOCK DIAGRAM