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HT-CT770
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74
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Service Manual
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Device
Audio
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ht-ct770.pdf
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Sony HT-CT770 Service Manual ▷ View online

SERVICE MANUAL
Sony Corporation
Published by Sony Techno Create Corporation
HT-CT770
SA-CT770
SPECIFICATIONS
HT-CT770
SOUND BAR
SA-CT770
ACTIVE SPEAKER SYSTEM
9-893-982-03
2014G33-1
© 
2014.07
US Model
Canadian Model
AEP Model
UK Model
Australian Model
Chinese Model
Saudi Arabia Model
Mexican Model
Singapore Model
Taiwan Model
Ver. 1.2  2014.07
•  All of the units included in the HT-CT770 (SA-CT770/
SA-WCT770) are required to confi rming operation of SA-
CT770. Check in advance that you have all of the units.
COMPONENT  MODEL  NAME
HT-CT770
Bar Speaker (Active Speaker System)
SA-CT770
Subwoofer (Active Subwoofer)
SA-WCT770
Amplifier section
U.S. models:
POWER OUTPUT AND TOTAL HARMONIC DISTORTION:
(FTC)
Front L + Front R:
With 4 ohms loads, both channels driven, from 200 - 20,000 Hz; 
rated 35 Watts per channel minimum RMS power, with no more than  
1% total harmonic distortion from 250 milliwatts to rated output.
POWER OUTPUT (reference)
Front L/Front R: 105 Watts (per channel at 4 ohms, 1 kHz)
Except US model:
POWER OUTPUT (rated)
Front L + Front R: 50 W + 50 W 
(at 4 ohms, 1 kHz, 1% THD)
POWER OUTPUT (reference)
Front L/Front R: 105 Watts (per channel at 4 ohms, 1 kHz)
Inputs
HDMI IN 1/2/3*
ANALOG IN
DIGITAL IN (OPT (TV))
*
These 3 jacks are identical. Using any of them makes no difference. 
Output
HDMI OUT (TV (ARC))
BLUETOOTH section 
Communication system 
BLUETOOTH Specification version 3.0
Output 
BLUETOOTH Specification Power Class 2
Maximum communication range 
Line of sight approx. 10 m (33 ft)
1)
Maximum number of devices to be registered
9 devices
Frequency band 
2.4 GHz band (2.4000 GHz - 2.4835 GHz) 
Modulation method 
FHSS (Freq Hopping Spread Spectrum)
Compatible BLUETOOTH profiles
2)
A2DP (Advanced Audio Distribution Profile) 
AVRCP 1.3 (Audio Video Remote Control Profile)
Supported Codecs
3)
SBC
4)
, AAC
5)
Transmission range (A2DP) 
20 Hz - 20,000 Hz (Sampling frequency 44.1 kHz) 
1) The actual range will vary depending on factors such as obstacles 
between devices, magnetic fields around a microwave oven, static  
electricity, cordless phone, reception sensitivity, operating system, 
software application, etc.
2) BLUETOOTH standard profiles indicate the purpose of BLUETOOTH 
communication between devices.
3) Codec: Audio signal compression and conversion format
4) Subband Codec 
5) Advanced Audio Coding
Front L/Front R speaker section
Speaker system
2-way speaker system, Acoustic suspension
Speaker
60 mm (2 3/8 in) cone type woofer
20 mm (13/16 in) balance drive tweeter
Rated impedance
4 ohms
General
Power requirements
120 V AC, 60 Hz (US,Canadian and Mexican models)
220 V - 240 V AC, 50 Hz/60 Hz
(AEP, UK, Australian, Chinese and Singapore models)
110 V - 240 V AC, 50 Hz/60 Hz (Saudi Arabia model)
120 V AC, 50 Hz/60 Hz (Taiwan model)
Power consumption
On: 34 W
Standby mode (Control for HDMI is set to on): 0.5 W or less
Standby mode (Control for HDMI is set to off): 0.3 W or less
BLUETOOTH Standby mode: 0.5 W or less
Dimensions (approx.) (w/h/d) (Except Chinese model)
1030 mm × 50 mm × 113 mm (40 5/8 in × 2 in × 4 1/2 in)
(without wall mounting brackets) 
1030 mm × 113 mm × 72 mm (40 5/8 in × 4 1/2 in × 2 7/8 in)
(with wall mounting brackets)
Dimensions (approx.) (w/h/d) (Chinese model)
1035 mm × 52 mm × 113 mm (40 5/8 in × 2 in × 4 1/2 in)
(without wall mounting brackets) 
1035 mm × 115 mm × 75 mm (40 5/8 in × 4 1/2 in × 2 7/8 in)
(with wall mounting brackets)
Mass (approx.)
2.6 kg (5 Ib 11 3/4 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
Digital audio input formats supported by the system
* It is possible to input these formats only with HDMI connection.
Wireless transmitter section
Dolby Digital
DTS-HD Master Audio*
Dolby Digital Plus*
DTS-HD High Resolution Audio*
Dolby TrueHD*
DTS-HD Low Bit Rate*
DTS
Linear PCM 2ch 48 kHz or less
DTS 96/24
Linear PCM Maximum 7.1ch 192 kHz or less*
– Continued on next page –
Photo: SA-CT770
HT-CT770
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.
Accesseries
Remote control (1)
R6 (size AA) batteries (2)
Optical digital cable for a TV (1)
Wall mounting brackets (2) and screws (2)
Startup Guide (1)
Operating Instructions (1)
Video formats supported by the system
Input/Output (HDMI Repeater block)
*1
YCbCr 4:2:0/Supported 8-bit only
*2
Supported 8-bit only
Design and specifications are subject to change without notice.
File
2D
3D
Frame 
packing
Side-by-
Side (Half)
Over-Under 
(Top-and-
Bottom)
4096 × 2160p @ 59.94/60 Hz
*1
4096 × 2160p @ 50 Hz
*1
4096 × 2160p @ 23.98/24 Hz
*2
3840 × 2160p @ 59.94/60 Hz
*1
3840 × 2160p @ 50 Hz
*1
3840 × 2160p @ 29.97/30 Hz
*2
3840 × 2160p @ 25 Hz
*2
3840 × 2160p @ 23.98/24 Hz
*2
1920 × 1080p @ 59.94/60 Hz
1920 × 1080p @ 50 Hz
1920 × 1080p @ 29.97/30 Hz
1920 × 1080p @ 25 Hz
1920 × 1080p @ 23.98/24 Hz
1920 × 1080i @ 59.94/60 Hz
1920 × 1080i @ 50 Hz
1280 × 720p @ 59.94/60 Hz
1280 × 720p @ 50 Hz
1280 × 720p @ 29.97/30 Hz
1280 × 720p @ 23.98/24 Hz
720 × 480p @ 59.94/60 Hz
720 × 576p @ 50 Hz
640 × 480p @ 59.94/60 Hz
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.
** 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.
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.
“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.
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.
“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.
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. 
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)
Other trademarks and trade names are those of their respective owners.
Copyrights
HT-CT770
3
1. 
SERVICING  NOTES 
 .............................................  
4
2. DISASSEMBLY
2-1. Disassembly 
Flow 
...........................................................   7
2-2. Panel 
Top 
Block-1 
...........................................................   7
2-3. Panel 
Top 
Block-2 
...........................................................   8
2-4.  Loudspeaker (6 cm) (L-ch, R-ch) (SP1, SP2) .................   9
2-5.  TW Assy (L-ch, R-ch) (SP3, SP4) ..................................   10
2-6.  DISPLAY Board Block ...................................................   11
2-7. DISPLAY 
Board 
.............................................................  11
2-8.  NFC Module (NFC1) ......................................................   12
2-9.  RF Modulator (RF1) .......................................................   12
2-10.  MAIN Board Block-1 .....................................................   13
2-11.  MAIN Board Block-2 .....................................................   14
2-12. MAIN Board ...................................................................   14
2-13.  Connection Cable with Speaker (L-ch, R-ch) 
(SPC1, SPC2) ..................................................................   15
2-14.  Power Cord (AC1) ..........................................................   16
2-15. POWER Board ................................................................   16
2-16.  Bracket (Main) Block .....................................................   17
2-17. HDMI Board ...................................................................   18
2-18.  Bracket (Power) Block ....................................................   18
2-19.  Bluetooth Module (BT1) ................................................   19
3. 
TEST  MODE 
 ............................................................   20
4. TROUBLESHOOTING 
 ..........................................   25
5. DIAGRAMS
5-1.  Block Diagram - HDMI Section - ...................................   26
5-2.  Block Diagram - MAIN Section - ...................................   27
TABLE  OF  CONTENTS
5-3.  Block Diagram - AMP Section - .....................................   28
5-4. Block 
Diagram 
- PANEL/POWER SUPPLY Section - ............................   29
5-5.  Printed Wiring Board - IO Board - .................................   31
5-6.  Schematic Diagram - IO Board - ....................................   31
5-7.  Printed Wiring Board - HDMI Board - ...........................   32
5-8.  Schematic Diagram - HDMI Board - ..............................   33
5-9.  Printed Wiring Board - MAIN Board (Side A) - ............   34
5-10.  Printed Wiring Board - MAIN Board (Side B) - ............   35
5-11.  Schematic Diagram - MAIN Board (1/6) - .....................   36
5-12.  Schematic Diagram - MAIN Board (2/6) - .....................   37
5-13.  Schematic Diagram - MAIN Board (3/6) - .....................   38
5-14.  Schematic Diagram - MAIN Board (4/6) - .....................   39
5-15.  Schematic Diagram - MAIN Board (5/6) - .....................   40
5-16.  Schematic Diagram - MAIN Board (6/6) - .....................   41
5-17.  Printed Wiring Boards - PANEL Section - .....................   42
5-18.  Schematic Diagram - PANEL Section - ..........................   43
5-19.  Printed Wiring Board - POWER Board - ........................   44
5-20.  Schematic Diagram - POWER Board - ..........................   45
6. 
EXPLODED  VIEWS
6-1. Overall 
Section 
...............................................................  58
6-2.  Top Panel Section ...........................................................   59
6-3.  MAIN Board Section ......................................................   60
6-4.  Bottom Cabinet Section ..................................................   61
7. 
ELECTRICAL  PARTS  LIST 
 ..............................   62
Accessories are given in the last of the electrical parts list.
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.
Ver. 1.1
HT-CT770
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 
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.
ADVANCE  PREPARATION  WHEN  CONFIRMING  OP-
ERATION
All of the units included in the HT-CT770 (SA-CT770/SA-WCT770) 
are required to confi rming operation of SA-CT770. Check in ad-
vance 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.
NOTE  OF  REPLACING  THE  PARTS  ON  THE  HDMI  BOARD
In Except US and Canadian models of this unit, each parts for Ref. 
No. CN3000/3001/3002/3006 and Ref. No. RB3000/3001 is using 
two kinds of parts.
When replacing these parts, it is necessary to replace it for parts 
same as parts before replacing, and there is a combination.
Replace the parts after distinguishing the type of parts referring to 
the following.
Type
A
B
Distinguishing 
Method
The terminals 
cannot be seen.
CN3000
CN3001
CN3002
CN3006
The terminals 
can be seen.
CN3000
CN3001
CN3002
CN3006
CN3000/3001/
3002/3006
Part No.
1-843-486-21
Part No.
1-821-398-41
RB3000/3001
Part No.
1-457-539-11
Part No.
1-234-400-21
NOTE  OF  REPLACING  THE  IC3009  ON  THE  HDMI 
BOARD
IC3009 on the HDMI board cannot replace with single. When this 
part is damaged, replace the complete mounted board.
NOTE  OF  REPLACING  THE  IC1009,  IC1010  AND  IC1012  
ON  THE  MAIN  BOARD
IC1009, IC1010 and IC1012 on the MAIN board cannot replace 
with single. When these parts are damaged, replace the complete 
mounted board.
“PRTECT (PROTECT)”  APPEARS  ON  THE  DISPLAY  OF  
THE  BAR  SPEAKER
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.
NOTE  OF  REPLACING  THE  IC3001  ON  THE  MAIN  
BOARD  AND  THE  COMPLETE  MAIN  BOARD
When IC3001 on the MAIN board and the complete MAIN board 
are replaced, it is necessary to spread the compound between the 
MAIN board and the heat sink.
Spread the compound (THERMAL COMPOUND (G747)) refer-
ring to the fi gure below.
– MAIN Board (Side B) –
thermal compound (G747)
IC3001
CAPACITOR  ELECTRICAL  DISCHARGE  PROCESSING 
When checking the board, for the electric shock prevention, con-
nect the resistors to both ends of respective capacitor (C914 or 
C915) to discharge the capacitor (C914 or C915).
– POWER Board (Conductor Side) –
(US, Canadian and Taiwan models)
– POWER Board (Conductor Side) –
(Except US, Canadian and Taiwan models)
C914
800 
:/2 W
C915
800 
:/2 W
Ver. 1.1
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  • DOWNLOAD Sony HT-CT770 Service Manual ↓ Size: 5.34 MB | Pages: 74 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sony HT-CT770 in PDF for free, which will help you to disassemble, recover, fix and repair Sony HT-CT770 Audio. Information contained in Sony HT-CT770 Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.