SAVA-57 - Sony Audio Service Manual (repair manual)

sava-57 service manual
Model
SAVA-57
Pages
28
Size
694.73 KB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
sava-57.pdf
Date

Read Sony SAVA-57 Service Manual online

— 1 —
SAVA-57
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
Chinese Model
SERVICE MANUAL
MICROFILM
• FRONT SPEAKER SYSTEM
• REAR SPEAKER
• TRANSMITTER
SPECIFICATIONS
HOME THEATER ACTIVE SPEAKER SYSTEM
— 2 —
MODEL IDENTIFICATION
— BACK PANEL — (L-ch)
Parts No.
PARTS No.
US model
CND model
AEP, UK, G, E, SP, MY,
TH, AUS model
CH model
MODEL
4-991-281-0
4-991-281-1
4-991-281-2
4-991-281-3
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
 damaged by heat.
ATTENTION AU COMPOSANT AYANT RAPPORT
 À LA SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 
!
 SUR
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE  DES
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE
FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS
QUE PAR DES PIÈCES SONY DONT LES NUMÉROS
SONT DONNÉS DANS CE MANUEL OU DANS LES
SUPPLÉMENTS PUBLIÉS PAR SONY.
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY MARK 
!
 OR DOTTED LINE
WITH MARK 
!
 ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
TABLE OF CONTENTS
1. SERVICING NOTE
.......................................................... 3
2. GENERAL
.......................................................................... 4
3. DISASSEMBLY
3-1. Front Panel Assembly ........................................................... 5
3-2. Amplifier Block .................................................................... 5
4. TEST  MODE
....................................................................... 6
5. ELECTRICAL ADJUSTMENTS
................................. 6
6. DIAGRAMS
6-1. Circuit Boards Location ........................................................ 8
6-2. Printed Wiring Board — Display Section — ........................ 9
6-3. Schematic Diagram — Display Section — ........................ 11
6-4. Schematic Diagram — Main Section — ............................ 13
6-5. Printed Wiring Board — Main Section — .......................... 17
6-6. Schematic Diagram — P. S Section — ............................... 20
6-7. Printed Wiring Board — P. S Section — ............................ 23
6-8. Printed Wiring Board — Transmitter Section — ................ 25
6-9. Schematic Diagram — Transmitter Section — .................. 27
6-10. Printed Wiring Board — Receiver Section — .................. 29
6-11. Schematic Diagram — Receiver Section — ..................... 31
6-12. IC Block Diagrams ............................................................ 33
6-13. IC Pin Function ................................................................. 36
7. EXPLODED VIEWS
7-1. Front Speaker System (RIGHT) Section ............................ 37
7-2. Front Speaker System (LEFT) Section ............................... 38
7-3. Amplifier Section ................................................................ 39
7-4. Transmitter Section (EMT-VA57) ....................................... 40
7-5. Rear Speaker (PASSIVE) Section (SA-IF57) ..................... 41
7-6. Rear Speaker (ACTIVE) Section (SA-IF57) ...................... 42
8. ELECTRICAL PARTS LIST
........................................ 43
• Abbreviation
CND : Canadian model.
G
: German model.
SP
: Singapore model.
MY : Malaysia model.
TH
: Thai model.
AUS : Australian model.
CH
: Chinese model.
— 3 —
SAFETY  CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.
LEAKAGE
The AC leakage from any exposed metal part to earth Ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers). Leak-
age current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM
or battery-operated AC voltmeter. The “limit” indication is 0.75
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
Fig. A. Using an AC voltmeter to check AC leakage.
SECTION  1
SERVICING NOTE
Connecting the Unit
• This unit is composed of a front speaker, transmitter and rear
speaker.
As the transmitter does not have its own power supply, connect it
to the front speaker as shown below when repairing.
• Connection
Auto Power Control of Rear Speaker
• As the rear speaker is equipped with an auto power control, it will
set into the STANDBY state if it does not receive carrier wave
from the transmitter.
When performing repairs, connect the units according to the us-
ing environment.
AC
voltmeter
(0.75V)
1.5k
0.15
µ
F
Earth Ground
To Exposed Metal
Parts on Set
MAIN board J103
REAR SPEAKER
FRONT
SPEAKER
transmitter
Rear speaker
— 4 —
SECTION 2
GENERAL
Location of Parts and Controls
1
2
3
4
5
6
7
1 POWER button
2 MASTER VOL –/+ button
3 S.WOOFER button
4 CTR MODE button
5 Remote sensor
6 SURROUND button
7 INPUT button
This section is extracted from
instruction manual.
Page of 28
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Download Sony SAVA-57 Service Manual (Repair Manual)

Here you can read online and download Sony SAVA-57 Service Manual in PDF. SAVA-57 service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony SAVA-57 Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.