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SAVA-27
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
Chinese Model
SERVICE MANUAL
HOME THEATER ACTIVE SPEAKER SYSTEM
MICROFILM
SPECIFICATIONS
-- Continued on next page --
(Rear)
(R-ch)
(L-ch)


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-- 2 --
TABLE OF CONTENTS
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.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS 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 PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.
TEST MODE ·································································· 3
1.
GENERAL ······································································ 4
2.
DISASSEMBLY
2-1.
Removal Amplifier Block ·················································· 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 --Display Section -- ······················· 14
3-5.
Printed Wiring Board --Display Section -- ···················· 17
3-6.
IC Pin Function ································································ 20
3-7.
IC Block Diagrams ··························································· 21
4.
EXPLODED VIEWS
4-1.
System (L) Assy ······························································· 23
4-2.
System (R) Assy ······························································· 24
4-3.
Amplifier Section ····························································· 25
4-4.
Rear Speaker Section ························································ 26
5.
ELECTRICAL PARTS LIST ··································· 27
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 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).
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. 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 passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)
SAFETY CHECK-OUT
To Exposed Metal
Parts on Set
0.15
µF
1.5k
AC
voltmeter
(0.75V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.


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SAVA-27
SECTION 1
GENERAL
SECTION 2
DISASSEMBLY
SECTION 3
DIAGRAMS
3-1.
CIRCUIT BOARDS LOCATION
­ 3 ­
­ 4 ­
­ 5 ­
1
2
3
4
4
5
1 LEFT CHANNEL SPEAKER/CENTER CHANNEL WOOFER
2 CENTER CHANNEL TWEETERS
3 RIGHT CHANNEL SPEAKER/CENTER CHANNEL WOOFER
4 SUPER WOOFER
5 REAR SPEAKER
6
7
!
8
9
@TM
@
!TM
6 THEATER
7 PRO LOGIC
8 STADIUM
9 GAME
INPUT1
INPUT2
!TM MUTING
MASTER VOL
SUPER WOOFER MODE (1, 2, OFF)
!
SUR OFF
HALL
POWER
POWER
STANDBY indicator
ON/READY indicator
VOLUME
@TM S.WOOFER
Remote Sensorg
SURROUND
@
INPUT
2-1.
REMOVAL AMPLIFIER BLOCK
1 Grill frame assembly
2 Ornament frame
3 Three tapping screws
(4
×20)
4 Front frame assembly
5 Four tapping screws
(4
×20)
7 Display panel assembly
!§ One connector
PS Board
!
Back panel
8 5th tapping screws (4
×16)
9 8th tapping screws
(4
×16)
!º Three tapping screws (4
×16)
!¡ 6P connector
!TM 5th screws
(BVTP 3
×8)
!£ Four screws
(BVTP 3
×8)
!¢ Two screws
(BVTP 3
×8)
!¶ Amplifier
SDN651
6 Flat type wire
(27core)
­ 6 ­
This section is extracted
from instruction manual.
INPUT board
MAIN board
POWER board
POW-SW board
POW-SR board
POW-CN board
POW-L board
POW-R board
DOLBY board
PS board
T1 board
T2 board
KEY board
DISPLAY board
TEST MODE
MODE ALL FLUORESCENT INDICATOR TUBES
LIGHT
When the AC plug is inserted to the power outlet with pressing the
MASTER VOL + button, the all fluorescent indicator tubes light.
KEY CHECK, LED LIGHTING MODE
1. Pull out the AC plug from the power outlet and turn the power
OFF.
2. Connect the lead wire to TP3 on the KEY board.
3. Insert the AC plug to the power outlet and set to STANDBY
mode.
4. Let the lead wire connected in step 1 contact to the ground.
5. All fluorescent indicator tubes light, and enter the key check
mode.
6. Pressing any buttons, the number of button will be displayed
on the fluorescent indicator tube.
7. After all buttons are pressed, it will be in the STANDBY mode.
Note:
1. The LED (D505)lights while pressing each button.
The LED lights in red when ever number of buttons are pressed,
and it lights in green when odd number of buttons are pressed.
2. The LED lights even when the pressed button is pressed again.
· Parts Location
[KEY BOARD] -- Conductor side --
CN552
IC503
S506
R557
TP3
Button
POWER
MASTER VOL­
MASTER VOL +
INPUT
SURROUND
CTR MODE
S.WOOFER
Button Number
2
3
4
5
6
7
8
LED Color
Red
Green
Red
Green
Red
Green
Red


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