Sony ST H7900 Service Manual

Page 1

ST-H'IBUU

SERVICE MANUAL

This set is the tuner section
in MHC-7900/P100X

U8 Model
Canadian Model
AEP Model

UK Model

E Model
Australian Model
Tourist Model

SPECIFICATIONS

Tuner

US and Canadian models

FM stereo, FM/AM superheterodyne tuner

UK and European models

FM stereo, FM/MW/LW superheterodyne tuner
Other countries model

FM stereo, FM/MW/SW superheterodyne tuner

FM tuner section
Tuning range 87.5 - 108.0 MHZ
Antenna terminals 75 ohm unbalanced
Intermediate frequency

10.7 MHZ

AM tuner section

US and Canadian models

Tuning range 5304.710 kHz
(with the AM tuning
interval set at 10 kHz)
531-1,602 kill
(with the AM tuning
Interval set at 9 kHz)

UK and European models (except
Germany and Italy):

MW: 531 _. 1,602 kHz
LW: 153 - 279 kHz
German model:
AM: 531 - 1,602 ldlz
ltalian model:
AM: 522 - 1,611 kHz
Other countries model :
MW: 531 - 1,602 kHz
(with the MW tuning
interval set at 9 kHz)
SW: 5.95 - 17.90 MHZ
Aerial AM loop aerial (antenna)
(Antenna) External aerian (antenna) terminals

intermediate frequency
450 kHz
Dimensions
Approx. 225 x 85 x 240 mm (w/h/d)
(3 7/8 x 3 3/8 x 9 1/2 inches)
Mass Approxr 1A kg
(3 lb 1 oz)

Design and specifications are subject to change without notice.

TUNER
S ONY;

Page 2

MODEL IDENTIFICATION
- MAIN BOARD -

MAIN BOARD (SOLDERING SIDE)

TABLE OF CONTENTS

SQSILQD me Base
1. SERVICE NOTE ................................................... 3
2. GENERAL ............................................................... 4
3. ELECTRICAL ADJUSTMENTS ............................. 5
4. DIAGRAMS

4-I. 1C Pin Functions

- ICIOI Tuner System Controller
(uPD7SOIZBGC-627-ABS) .

0ND : Canadian model
AUS : Australian model
EA : Saudi Arabia model
JE : Tourist model

SP : Singapore model
G : German model

IT : Italian model

MY : Malaysia model

Notes on chip component replacement
0 Never reuse a disconnected chip component.

- Notice that the minus side ofa tantalum capacitor may be damaged

by heat.

SAFETY-RELATED COMPONENT WARNING II

COMPONENTS IDENTIFIED BY MARK A OR DOTTED

LINE WITH MARK A ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE

OPERATION. REPLACE THESE COMPONENTS WITH
SONV PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONV.

ATTENTION Au COMPOSANT AVANT RAPPORT
A LA SECURITEII

LEs COMPOSANTS IDENTIFIES PAR UNE MARQUE A
sun LES DIAGRAMMES SCHEMATIQUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA sEcuRITE
DE FONCTIONNEMENT. NE REMPLACER CES
COMPOSANTS QUE PAR DES PIECES SONY DONT
LES NUMEROS SONT DONNDEs DANS CE MANUEL
ou DANS LES SUPPLEMENTS PUBLIES PAR SONV.

4-2. Block Diagram . 9
4-3 Printed Wiring Boards -Main Section -
4-4. Schematic Diagram -Main Section
4-5. Primed Wiring Board -Tuner Section -
(AEP.UK,G,IT model)
4-6. Printed Wiring Board -Tuner Section -
(US, CND, E, AUS. EA, JE, SP, MY mode)
4-7. Schematic Diagram -Tnner Section ~ .................................. 19
JW1 sz JW3 (US, CND, E, AUS. EA, JE, SP, MY model)
US,CND MOUNTED NONE NONE 4-8. Schematic Diagram Tuner Section - 21
(AEP,UK,G,IT model)
AEP' UK MOUNTED NONE MOUNTED 4-9t Semiconductor Lead Layouts 23
EleUSSIPEA MOUNTED MOUNTED NONE
5. EXPLODED VIEWS
G NONE NONE MOUNTED 5 IT NONE MOUNTED MOUNTED
6. ELECTRICAL PARTS LIST ................................... 25
MY MOUNTED MOUNTED NONE