Sony SAVA-7 Service manual
SAVA-7
SERVICE MANUAL
SPECIFICATIONS
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
Chinese Model
MICROFILM
ACTIVE SURROUND SPEAKER SYSTEM
TABLE OF CONTENTS
1. GENERAL········································································· 3
2. DISASSEMBLY
2-1. GRILLE FRAME ASSY,
FRONT PANEL ASSY, FRONT SPEAKER ····················· 4
2-2. TOP GRILLE ASSY, TOP SPEAKER······························· 4
2-3. STAND ASSY, BOTTOM GRILLE,
BOTTOM SPEAKER ························································ 5
3. DIAGRAMS
3-1. CIRCUIT BOARDS LOCATION ······································ 6
3-2. SCHEMATIC DIAGRAM – MAIN SECTION –·············· 7
3-3. PRINTED WIRING BOARD – MAIN SECTION –······· 11
3-4. SCHEMATIC DIAGRAM
3-5. PRINTED WIRING BOARD
3-6. IC PIN FUNCTIONS ······················································· 17
3-7. IC BLOCK DIAGRAMS ················································· 18
4. EXPLODED VIEWS
4-1. SYSTEM (L) ASSY FRONT ··········································· 20
4-2. SYSTEM (L) ASSY BACK ············································· 21
4-3. SYSTEM (R) ASSY FRONT ··········································· 22
4-4. SYSTEM (R) ASSY BACK ·············································23
5. ELECTRICAL PARTS LIST········································· 24
– DISPLAY SECTION – ········
– DISPLAY SECTION – ···
14
16
SAFETY CHECK-OUT
After correcting the original service problem, perform the
following 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 A C leakag e. 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).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT -540A. Follo w 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 v oltmeter . The “limit” indication
is 0.75 V, so analog meters must ha v e an accurate lo w-v oltage
scale. The Simpson 250 and Sanwa SH-63T rd are examples of
a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)
To Exposed Metal
Parts on Set
AC
0.15
µ
F 1.5k
Ω
voltmeter
(0.75V)
Earth Ground
Fig. A. Using an AC voltmeter to chec k A C leakage.
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 .
— 2 —
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS P AR UNE MARQUE ! SUR LES
DIAGRAMMES SCHÉMA TIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.
SECTION 1
GENERAL
This section is extracted
from instruction manual.
SECTION 2
4
Tapping
3.5
Tapping
3.5
×
12
×
DISASSEMBLY
8
Tapping
3.5
12
1
Top grille
2
×
12
0
Tapping
3.5
9
Speaker (7 cm)
Tapping
3.5
×
12
7
Front panel assy
6
Tapping
3.5
×
12
!¡
Speaker
(8 cm)
×
12
Note : Follow the disassembly procedure in the numerical order given.
1. GRILLE FRAME ASSY, FRONT PANEL ASSY, FRONT SPEAKER
Remove the cacher by prying it up
using
‘
No.0 head screw driver tip.
2
Cacher
1
Grille frame assy
3
Cacher
5
2. TOP GRILLE ASSY, TOP SPEAKER
3
Speaker
(7 cm)
Remove the top grille by
lifting it up with the inserted
flat head
’
screwdriver tip.
A
3. STAND ASSY, BOTTOM GRILLE, BOTTOM SPEAKER 3-1. CIRCUIT BOARDS LOCATION
DOLBY board
4
Tapping
3.5
×
12
3
Bottom
6
Speaker
(10 cm)
5
Tapping
3.5
grille
×
12
2
Tapping
3.5
1
Stand assy
(Open in the
×
12
direction of
the arrow.)
DISPLAY board
SECTION 3
DIAGRAMS
VOLUME board
POWER
board
CONNECTOR
board
SWITCH
board
SAVA-7
PS board
T1 board
T2 board
— 3 — — 4 — — 5 — — 6 —
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