Read Sony SA-WCT780 Service Manual online
SERVICE MANUAL
Sony Corporation
Published by Sony Techno Create Corporation
SA-WCT780
ACTIVE SUBWOOFER
9-896-147-03
2015G33-1
©
2015.07
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
Chinese Model
PX Model
Ver. 1.2 2015.07
• SA-WCT780 is the active subwoofer in HT-CT780.
• All of the units included in the HT-CT780 (SA-
• All of the units included in the HT-CT780 (SA-
WCT780/SA-CT780/Remote control) are required
to confi rming operation of SA-WCT780. Check in
advance that you have all of the units.
to confi rming operation of SA-WCT780. Check in
advance that you have all of the units.
• For the TEST MODE for this unit, refer to the service manual of HT-CT780.
SPECIFICATIONS
POWER OUTPUT (reference)
120 W (per channel at 4 ohms, 100 Hz)
(Except Chinese model)
75 W (per channel at 4 ohms, 100 Hz)
(Chinese model)
(Except Chinese model)
75 W (per channel at 4 ohms, 100 Hz)
(Chinese model)
Speaker system
Subwoofer system, Bass reflex
Speaker
16 cm (6
1
/
2
in) cone type
Power requirements
120 V AC, 60 Hz (US, CND)
120 V AC, 50 Hz/60 Hz (TW)
110 V - 240 V AC, 50 Hz/60 Hz (PX, EA3, LA, BR)
220 V - 240 V AC, 50 Hz/60 Hz (Other models)
120 V AC, 50 Hz/60 Hz (TW)
110 V - 240 V AC, 50 Hz/60 Hz (PX, EA3, LA, BR)
220 V - 240 V AC, 50 Hz/60 Hz (Other models)
Power consumption
On: 30 W
Standby mode: 0.5 W or less
Standby mode: 0.5 W or less
Dimensions (approx.) (w/h/d)
Mass (approx.)
7.9 kg (17 Ib 6
5
/
8
oz)
Speaker system
Wireless Sound Specification version
2.0
2.0
Frequency band
2.4 GHz (2.4000 GHz - 2.4835 GHz)
Modulation method
Pi / 4 DQPSK
Design and specifications are subject to
change without notice.
change without notice.
Wireless receiver section
191 mm × 382 mm × 390 mm (7
5
/
8
in ×
15
1
/
8
in × 15
3
/
8
in)
Brazilian model:
RMS POWER OUTPUT:
The following values were measured at
127 V AC 60 Hz
127 V AC 60 Hz
80 W (at 4 ohms, 100 Hz, 10% THD)
Except Brazilian model:
This system incorporates Dolby* Digital
and the DTS** Digital Surround System.
* Manufactured under license from
and the DTS** Digital Surround System.
* Manufactured under license from
Dolby Laboratories.
Dolby, and the double-D symbol are
trademarks of Dolby Laboratories.
Dolby, and the double-D symbol are
trademarks of Dolby Laboratories.
** For DTS patents, see http://
patents.dts.com. Manufactured
under license from DTS Licensing
Limited. DTS, DTS-HD, the Symbol, &
DTS and the Symbol together are
under license from DTS Licensing
Limited. DTS, DTS-HD, the Symbol, &
DTS and the Symbol together are
The BLUETOOTH
®
word mark and logos
are registered trademarks owned by
Bluetooth SIG, Inc. and any use of such
marks by Sony Corporation is under
license.
Bluetooth SIG, Inc. and any use of such
marks by Sony Corporation is under
license.
This system incorporates High-
Definition Multimedia Interface
(HDMI™) technology.
The terms HDMI and HDMI High-
Definition Multimedia Interface, and the
HDMI Logo are trademarks or registered
trademarks of HDMI Licensing LLC in the
United States and other countries.
Definition Multimedia Interface
(HDMI™) technology.
The terms HDMI and HDMI High-
Definition Multimedia Interface, and the
HDMI Logo are trademarks or registered
trademarks of HDMI Licensing LLC in the
United States and other countries.
The N Mark is a trademark or registered
trademark of NFC Forum, Inc. in the
United States and in other countries.
trademark of NFC Forum, Inc. in the
United States and in other countries.
Android™ and Google Play™ are
trademarks of Google Inc.
trademarks of Google Inc.
Copyrights and Trademarks
Apple, the Apple logo, iPhone, iPod, and
iPod touch are trademarks of Apple Inc.,
registered in the U.S. and other
countries. App Store is a service mark of
Apple Inc.
iPod touch are trademarks of Apple Inc.,
registered in the U.S. and other
countries. App Store is a service mark of
Apple Inc.
“Made for iPod,” and “Made for iPhone”
mean that an electronic accessory has
been designed to connect specifically to
iPod or iPhone, respectively, and has
been certified by the developer to meet
Apple performance standards. Apple is
not responsible for the operation of this
device or its compliance with safety and
regulatory standards. Please note that
the use of this accessory with iPod or
iPhone may affect wireless
performance.
mean that an electronic accessory has
been designed to connect specifically to
iPod or iPhone, respectively, and has
been certified by the developer to meet
Apple performance standards. Apple is
not responsible for the operation of this
device or its compliance with safety and
regulatory standards. Please note that
the use of this accessory with iPod or
iPhone may affect wireless
performance.
Compatible iPod/iPhone models
The compatible iPod/iPhone models
are as follows. Update your iPod/iPhone
with the latest software before using
with the system.
are as follows. Update your iPod/iPhone
with the latest software before using
with the system.
BLUETOOTH technology works with:
iPhone 6 Plus/iPhone 6/iPhone 5s/
iPhone 5c/iPhone 5/iPhone 4s/
iPhone 4/iPhone 3GS
iPod touch (5th generation)/iPod touch
(4th generation)
iPhone 6 Plus/iPhone 6/iPhone 5s/
iPhone 5c/iPhone 5/iPhone 4s/
iPhone 4/iPhone 3GS
iPod touch (5th generation)/iPod touch
(4th generation)
“BRAVIA” logo is a trademark of Sony
Corporation.
Corporation.
“DSEE” is a trademark of Sony
Corporation.
Corporation.
“ClearAudio+” is a trademark of Sony
Corporation.
Corporation.
“x.v.Color” and “x.v.Color” logo are
trademarks of Sony Corporation.
trademarks of Sony Corporation.
“PlayStation
®
” is a registered trademark
of Sony Computer Entertainment Inc.
Other trademarks and trade names are
those of their respective owners.
those of their respective owners.
registered trademarks of DTS, Inc.
© DTS, Inc. All Rights Reserved.
© DTS, Inc. All Rights Reserved.
SA-WCT780
2
NOTES ON CHIP COMPONENT REPLACEMENT
•
•
Never reuse a disconnected chip component.
•
Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
aged by heat.
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety check 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.
After correcting the original service problem, perform the follow-
ing safety check 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 TEST
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 microamperes.).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
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 microamperes.).
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.
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 2 V AC range are suitable. (See
Fig. A)
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 2 V AC range are suitable. (See
Fig. A)
1.5 k
Ω
0.15
μF
AC
voltmeter
(0.75 V)
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Parts on Set
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
SAFETY-RELATED COMPONENT WARNING!
COMPONENTS IDENTIFIED BY MARK
0 OR DOTTED LINE
WITH MARK
0 ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS
REPLACE THESE COMPONENTS WITH SONY PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE
0 SUR
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONC-
TIONNEMENT. NE REMPLACER CES COMPOSANTS QUE
PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DON-
NÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS
PUBLIÉS PAR SONY.
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONC-
TIONNEMENT. NE REMPLACER CES COMPOSANTS QUE
PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DON-
NÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS
PUBLIÉS PAR SONY.
1.
SERVICING NOTES
.............................................
3
2. DISASSEMBLY
2-1. Disassembly
Flow
........................................................... 7
2-2. Back Panel Block ............................................................ 8
2-3. SW-KEY Board, Button (POWER-CZ2)........................ 8
2-4. Fuse (F900), AMP Block ................................................ 9
2-5. Power Cord (AC1) .......................................................... 10
2-6. SW-POWER
2-3. SW-KEY Board, Button (POWER-CZ2)........................ 8
2-4. Fuse (F900), AMP Block ................................................ 9
2-5. Power Cord (AC1) .......................................................... 10
2-6. SW-POWER
Board
......................................................... 11
2-7. RF Modulator (SWA12-4V RX) (RF1) .......................... 12
2-8. SW-MAIN
2-8. SW-MAIN
Board
............................................................ 13
2-9. Front Panel Block ........................................................... 14
2-10. Grille Frame Assy, Front Panel ....................................... 15
2-11. Loudspeaker (16 cm) (SP1) ............................................ 15
2-10. Grille Frame Assy, Front Panel ....................................... 15
2-11. Loudspeaker (16 cm) (SP1) ............................................ 15
3. TROUBLESHOOTING
.......................................... 16
4. DIAGRAMS
4-1. Block
Diagram
................................................................ 18
4-2. Printed Wiring Boards - MAIN Section - ....................... 20
4-3. Schematic Diagram - MAIN Section - ........................... 21
4-4. Printed Wiring Board - SW-POWER Board - ................ 22
4-5. Schematic Diagram - SW-POWER Board - ................... 23
4-6. Printed Wiring Board - SW-LED Board - ....................... 24
4-7. Schematic Diagram - SW-LED Board - ......................... 24
4-3. Schematic Diagram - MAIN Section - ........................... 21
4-4. Printed Wiring Board - SW-POWER Board - ................ 22
4-5. Schematic Diagram - SW-POWER Board - ................... 23
4-6. Printed Wiring Board - SW-LED Board - ....................... 24
4-7. Schematic Diagram - SW-LED Board - ......................... 24
5.
EXPLODED VIEWS
5-1. Back Plate Section .......................................................... 29
5-2. AMP
5-2. AMP
Section
................................................................... 30
5-3. Speaker Cabinet Section ................................................. 31
6.
ELECTRICAL PARTS LIST
.............................. 32
TABLE OF CONTENTS
Ver. 1.1
SA-WCT780
3
SECTION 1
SERVICING NOTES
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40 °C higher
• Unleaded solder melts at a temperature about 40 °C higher
than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!
• Strong
viscosity
Unleaded solder is more viscous (sticky, less prone to fl ow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
•
Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
also be added to ordinary solder.
NOTE OF PERFORMING THE OPERATION CHECK IN
THE STATE THAT HEAT SINK WAS REMOVED
When performing the operation check in the state that this unit was
disassembled, it is possible to perform the operation check in the
state that heat sink was removed. But don’t perform the operation
check in the long time, and perform the operation check in the
volume state as low as possible.
THE STATE THAT HEAT SINK WAS REMOVED
When performing the operation check in the state that this unit was
disassembled, it is possible to perform the operation check in the
state that heat sink was removed. But don’t perform the operation
check in the long time, and perform the operation check in the
volume state as low as possible.
CAPACITOR ELECTRICAL DISCHARGE PROCESSING
When checking the board, for the electric shock prevention, con-
nect the resistors to both ends of capacitors to discharge the capaci-
tor as shown in the fi gure below.
When checking the board, for the electric shock prevention, con-
nect the resistors to both ends of capacitors to discharge the capaci-
tor as shown in the fi gure below.
– SW-POWER Board (Conductor Side) –
800
:/2 W
800
:/2 W
C941
C935 (US, Canadian and Taiwan models)
C936 (Except US, Canadian and Taiwan models)
C936 (Except US, Canadian and Taiwan models)
C951
800
:/2 W
The SERVICING NOTES contains important information for servicing. Be sure to read this section before repairing the unit.
Ver. 1.1
SA-WCT780
4
MODEL IDENTIFICATION
Distinguish by Part No. and destination code on the rear side of the main unit.
Distinguish by Part No. and destination code on the rear side of the main unit.
MODEL NUMBER LABEL
– Rear view –
(US, CND, BR)
(US, CND, BR)
Part No.
Destination code
MODEL NUMBER LABEL
Part No.
Destination code
– Rear view –
(Except US, CND, BR)
(Except US, CND, BR)
Destination
Part No.
Destination code
US, CND
4-562-327-0[]
UC2
AEP
4-562-329-0[]
CEL
EA3
4-562-330-0[]
EA3
PX
4-570-108-0[]
PX3
UK
4-570-109-0[]
CEK
E3
4-570-110-0[]
E3
SP
4-570-111-0[]
SP1
CH
4-570-112-0[]
CN4
AUS
4-570-113-0[]
AU1
TH
4-570-114-0[]
TH1
TW
4-570-115-0[]
TW2
LA
4-570-116-0[]
LA9
BR
4-570-128-0[]
BR1
DESTINATION ABBREVIATIONS
The following abbreviations for model destinations are used in this service manual.
The following abbreviations for model destinations are used in this service manual.
• Abbreviations
AUS :
AUS :
Australian
model
BR
: Brazilian model
CH
: Chinese model
CND : Canadian model
E3
E3
: African and Iranian models
EA3 : Saudi Arabia, UAE, Kuwait, Iraqi, Kenyan, Tanzanian and Nigerian models
LA
LA
: Latin American model (Except for Brazilian)
SP
: Singapore model
TH :
Thai
model
TW :
Taiwan
model
Ver. 1.2