Sony SA-WCT370 Service Manual ▷ View online
SERVICE MANUAL
Sony Corporation
Published by Sony Techno Create Corporation
SA-WCT370
ACTIVE SUBWOOFER
9-893-955-03
2014E33-1
©
2014.05
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
PX Model
Ver. 1.2 2014.05
• SA-WCT370 is the active subwoofer in HT-CT370.
• All of the units included in the HT-CT370 (SA-WCT370/
• All of the units included in the HT-CT370 (SA-WCT370/
SA-CT370) are required to confi rming operation of SA-
WCT370. Check in advance that you have all of the units.
WCT370. Check in advance that you have all of the units.
• For the TEST MODE for this unit, refer to the service manual of HT-CT370.
SPECIFICATIONS
POWER OUTPUT (reference)
100 W (per channel at 4 ohms, 100 Hz)
Speaker system
Subwoofer system, Bass reflex
Speaker
100 mm × 150 mm (4 in × 6 in) cone type
Rated impedance
4 ohms
Power requirements
120 V AC, 60 Hz (US and Canadian models)
220 V - 240 V AC, 50 Hz/60 Hz
(AEP, Russian, UK, Australian, Singapore, Argentina and Thai models)
220 V - 240 V AC, 50 Hz/60 Hz
(AEP, Russian, UK, Australian, Singapore, Argentina and Thai models)
(PX, Saudi Arabia, Latin American and Brazilian models)
110 V - 240 V AC, 50 Hz/60 Hz
Power consumption
On: 30 W
Standby mode: 0.5 W or less
Standby mode: 0.5 W or less
Dimensions (approx.) (w/h/d)
135 mm × 361.5 mm × 394 mm
(5 3/8 in × 14 1/4 in × 15 5/8 in) (vertical)
361.5 mm × 135 mm × 394 mm
(14 1/4 in × 5 3/8 in × 15 5/8 in) (horizontal)
(5 3/8 in × 14 1/4 in × 15 5/8 in) (vertical)
361.5 mm × 135 mm × 394 mm
(14 1/4 in × 5 3/8 in × 15 5/8 in) (horizontal)
Mass (approx.)
7.0 kg (15 Ib 6 7/8 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
Wireless receiver section
Design and specifications are subject to change without notice.
Except Brazilian model:
Brazilian model:
RMS POWER OUTPUT: 75 W (at 4 ohms, 100 Hz, 10% THD*)
The following values were measured at 127 V AC 60 Hz
* Total harmonic distortion
SA-WCT370
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.
This system incorporates Dolby* Digital and the DTS** Digital Surround
System.
* Manufactured under license from Dolby Laboratories.
System.
* Manufactured under license from Dolby Laboratories.
Dolby, and the double-D symbol are trademarks of Dolby
Laboratories.
Laboratories.
** Manufactured under license under U.S. Patent Nos: 5,956,674;
5,974,380; 6,226,616; 6,487,535; 7,212,872; 7,333,929; 7,392,195;
7,272,567 & other U.S. and worldwide patents issued & pending.
DTS-HD, the Symbol, & DTS-HD and the Symbol together are
registered trademarks of DTS, Inc.
Product includes software. © DTS, Inc. All Rights Reserved.
7,272,567 & other U.S. and worldwide patents issued & pending.
DTS-HD, the Symbol, & DTS-HD and the Symbol together are
registered trademarks of DTS, Inc.
Product includes software. © DTS, Inc. All Rights Reserved.
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.
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.
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.
“BRAVIA” logo is a trademark of Sony Corporation.
“DSEE” 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.
The N Mark is a trademark or registered trademark of NFC Forum, Inc. in
the United States and in other countries.
the United States and in other countries.
Android and Google Play are trademarks of Google Inc.
"ClearAudio+" is a trademark of Sony Corporation.
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.
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.
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.
Made for iPod/iPhone models
The compatible iPod/iPhone models are as follows. Update your iPod/
iPhone with the latest software before using with the system.
iPhone with the latest software before using with the system.
BLUETOOTH technology works with:
iPhone
iPhone 5s/iPhone 5c/iPhone 5/iPhone 4s/iPhone 4/iPhone 3GS
iPod touch
iPod touch (5th generation)/iPod touch (4th generation)
iPhone 5s/iPhone 5c/iPhone 5/iPhone 4s/iPhone 4/iPhone 3GS
iPod touch
iPod touch (5th generation)/iPod touch (4th generation)
Other trademarks and trade names are those of their respective owners.
Copyrights
SA-WCT370
3
1.
SERVICING NOTES
.............................................
4
2. DISASSEMBLY
2-1. Disassembly
Flow
........................................................... 6
2-2. Sub
AMP
Block
.............................................................. 7
2-3. RF Modulator (RF1) ....................................................... 8
2-4. Power Case Block, Fuse (F900) ..................................... 8
2-5. Rear Plate Block ............................................................. 9
2-6. Chassis Lid Block ........................................................... 9
2-7. SUB MAIN Board .......................................................... 10
2-8. POWER
2-4. Power Case Block, Fuse (F900) ..................................... 8
2-5. Rear Plate Block ............................................................. 9
2-6. Chassis Lid Block ........................................................... 9
2-7. SUB MAIN Board .......................................................... 10
2-8. POWER
Board
................................................................ 10
2-9. Front Panel Block ........................................................... 11
2-10. Loudspeaker (10 × 15 cm) (SP1) .................................... 12
2-10. Loudspeaker (10 × 15 cm) (SP1) .................................... 12
3. TROUBLESHOOTING
.......................................... 13
4. DIAGRAMS
4-1. Block
Diagram
................................................................ 14
4-2. Printed Wiring Board - SUB MAIN Board (Side A) - .... 16
4-3. Printed Wiring Board - SUB MAIN Board (Side B) - .... 17
4-4. Schematic Diagram - SUB MAIN Board (1/2) - ............ 18
4-5. Schematic Diagram - SUB MAIN Board (2/2) - ............ 19
4-6. Printed Wiring Board - POWER Board - ........................ 20
4-7. Schematic Diagram - POWER Board - .......................... 21
4-8. Printed
4-3. Printed Wiring Board - SUB MAIN Board (Side B) - .... 17
4-4. Schematic Diagram - SUB MAIN Board (1/2) - ............ 18
4-5. Schematic Diagram - SUB MAIN Board (2/2) - ............ 19
4-6. Printed Wiring Board - POWER Board - ........................ 20
4-7. Schematic Diagram - POWER Board - .......................... 21
4-8. Printed
Wiring
Boards
- SUB LED/SUB KEY Boards - ..................................... 22
4-9. Schematic Diagram - SUB LED/SUB KEY Boards - .... 22
5.
EXPLODED VIEWS
5-1. Overall
Section
............................................................... 27
5-2. Speaker
Section
............................................................... 28
5-3. RF Modulator Section ..................................................... 29
5-4. SUB MAIN Board Section ............................................. 30
5-5. POWER Board Section ................................................... 31
5-4. SUB MAIN Board Section ............................................. 30
5-5. POWER Board Section ................................................... 31
6.
ELECTRICAL PARTS LIST
.............................. 32
TABLE OF CONTENTS
SA-WCT370
4
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.
ADVANCE PREPARATION WHEN CONFIRMING OP-
ERATION
All of the units included in the HT-CT370 (SA-WCT370/SA-
CT370) are required to confi rming operation of SA-WCT370.
Check in advance that you have all of the units.
ERATION
All of the units included in the HT-CT370 (SA-WCT370/SA-
CT370) are required to confi rming operation of SA-WCT370.
Check in advance that you have all of the units.
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.
“PRTECT (PROTECT)” APPEARS ON THE DISPLAY OF
THE BAR SPEAKER (SA-CT370)
THE BAR SPEAKER (SA-CT370)
q Press the ÒÄÆ (on/standby) button to turn off the system. After the
indicator disappears, disconnect the AC power cord (mains lead)
then check that nothing is blocking the ventilation holes of the
system.
then check that nothing is blocking the ventilation holes of the
system.
NOTE OF REPLACING THE IC104 ON THE SUB MAIN
BOARD AND THE COMPLETE SUB MAIN BOARD
When IC104 on the SUB MAIN board and the complete SUB
MAIN board are replaced, it is necessary to spread the compound
between the SUB MAIN board and the heat sink.
Spread the compound (THERMAL COMPOUND (G747)) refer-
ring to the fi gure below.
BOARD AND THE COMPLETE SUB MAIN BOARD
When IC104 on the SUB MAIN board and the complete SUB
MAIN board are replaced, it is necessary to spread the compound
between the SUB MAIN board and the heat sink.
Spread the compound (THERMAL COMPOUND (G747)) refer-
ring to the fi gure below.
– SUB MAIN Board (Side A) –
IC104
thermal compound (G747)
CAPACITOR ELECTRICAL DISCHARGE PROCESSING
When checking the board, for the electric shock prevention, con-
nect the resistors to both ends of respective capacitor (C935 or
C936) to discharge the capacitor (C935 or C936).
When checking the board, for the electric shock prevention, con-
nect the resistors to both ends of respective capacitor (C935 or
C936) to discharge the capacitor (C935 or C936).
– POWER Board (Conductor Side) –
800
:/2 W
C935 (US and Canadian models)
C936 (Except US and Canadian models)
Ver. 1.2