SA-WCT780 - Sony Audio Service Manual (repair manual)

sa-wct780 service manual
Model
SA-WCT780
Pages
38
Size
2.22 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
sa-wct780.pdf
Date

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-
WCT780/SA-CT780/Remote control) are required 
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)
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)
Power consumption
On: 30 W
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
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.
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
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 
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 
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.
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.
The N Mark is a trademark or registered 
trademark of NFC Forum, Inc. in the 
United States and in other countries.
Android™ and Google Play™ are 
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.
“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.
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.
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)
“BRAVIA” logo is a trademark of Sony 
Corporation.
“DSEE” is a trademark of Sony 
Corporation.
“ClearAudio+” is a trademark of Sony 
Corporation.
“x.v.Color” and “x.v.Color” logo are 
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.
registered trademarks of DTS, Inc. 
© 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.
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.
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 
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 2 V AC range are suitable. (See 
Fig. A)
1.5 k
Ω
0.15 
μF
AC
voltmeter
(0.75 V)
To Exposed Metal
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 
 
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  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.
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 
Board 
.........................................................  11
2-7.  RF Modulator (SWA12-4V RX) (RF1) ..........................   12
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
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
5. 
EXPLODED  VIEWS
5-1.  Back Plate Section ..........................................................   29
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 
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 
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.
 
Soldering irons using a temperature regulator should be set to 
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.
• 
Usable with ordinary solder
 
It is best to use only unleaded solder but unleaded solder may 
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.
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.
– 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)
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.
MODEL NUMBER LABEL
– Rear view –
(US, CND, BR)
Part No.
Destination code
MODEL NUMBER LABEL
Part No.
Destination code
– Rear view –
(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.
• Abbreviations
 AUS : 
Australian 
model
  BR 
: Brazilian model
  CH 
: Chinese model
  CND  : Canadian model
  E3 
: African and Iranian models
  EA3  : Saudi Arabia, UAE, Kuwait, Iraqi, Kenyan, Tanzanian and Nigerian models
  LA 
: Latin American model (Except for Brazilian)
  SP 
: Singapore model
 TH  : 
Thai 
model
 TW  : 
Taiwan 
model
Ver. 1.2
Page of 38
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Here you can read online and download Sony SA-WCT780 Service Manual in PDF. SA-WCT780 service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony SA-WCT780 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.