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2013I33-1

© 

2013.09

•  All of the units included in the HT-ST7 (SA-

ST7/SA-WST7/EZW-RT50) are required to 
confi rming operation of SA-ST7. Check in 
advance that you have all of the units.

HT-ST7

Bar Speaker (Active Speaker System)

SA-ST7

Subwoofer (Active Subwoofer)

SA-WST7

Wireless transceiver

EZW-RT50

•  Please refer to service manual separately issued for Subwoofer.
  As for EZW-RT50, the part number has been described to this 

service manual.

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 
25 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 speaker blocks: 50 Watts (per channel at 4 ohms, 
1 kHz)
Center speaker block: 50 Watts (per channel at 4 ohms, 1 kHz)

Canadian and Taiwan models:
POWER OUTPUT (rated)

Front L + Front R: 35 W + 35 W
(at 4 ohms, 1 kHz, 1 % THD)

POWER OUTPUT (reference)

Front L/Front R speaker blocks: 50 Watts (per channel at 4 ohms, 
1 kHz)
Center speaker block: 50 Watts (per channel at 4 ohms, 1 kHz)

AEP, Russian, UK, Australian and Singapore models:
POWER OUTPUT (rated)

Front L + Front R: 40 W + 40 W
(at 4 ohms, 1 kHz, 1 % THD)

POWER OUTPUT (reference)

Front L/Front R speaker blocks: 50 Watts (per channel at 4 ohms, 
1 kHz)
Center speaker block: 50 Watts (per channel at 4 ohms, 1 kHz)

Inputs

HDMI IN 1/2/3*
OPTICAL IN 1(TV)/2
ANALOG IN
COAXIAL IN

* These 3 jacks are identical. Using any of them makes no difference. 
Output

HDMI TV OUT (ARC)

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)

, aptX

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

Speaker system

2-way speaker system, Acoustic suspension

Speaker

Woofer: 65 mm (2 5/8 in) cone type, Magnetic fluid speaker
Tweeter; 20 mm (13/16 in) dome type

Rated impedance

4 ohms

Speaker system

Full range speaker system, Acoustic suspension

Speaker (5 speakers)

65 mm (2 5/8 in) cone type, Magnetic fluid speaker

Rated impedance

4 ohms

Power requirements

120 V AC, 60 Hz (US and Canadian models)
120 V AC, 50 Hz/60 Hz (Taiwan model)
220 V - 240 V AC, 50 Hz/60 Hz
(AEP, Russian, UK, Australian and Singapore models)

Power consumption

On: 50 W (US and Canadian models)
On: 55 W (Except US and Canadian models)
“Control for HDMI” is off (Standby mode): 0.5 W or less
BLUETOOTH Standby mode: 0.5 W or less

Dimensions (approx.) (w/h/d)

1,080 mm × 109 mm × 110 mm (42 5/8 in × 4 3/8 in × 4 3/8 in)   
(without grille frame, without stands)
1,080 mm × 109 mm × 129 mm (42 5/8 in × 4 3/8 in × 5 1/8 in) 
(with grille frame, without stands)
1,080 mm × 129 mm × 138 mm (42 5/8 in × 5 1/8 in × 5 1/2 in) 
(with grille frame, with stands)
1,080 mm × 129 mm × 130 mm (42 5/8 in × 5 1/8 in × 5 1/8 in) 
(without grille fr am e, with stands)

Mass (approx.)

7.9 kg (17 Ib 6 5/8 oz) (with grille frame, with stands)

Communication System

Wireless Sound Specification version 1.0

Frequency band

5.736 GHz - 5.814 GHz  (US and Canadian models)
5.725 GHz - 5.875 GHz 

 (Except US and Canadian models)

Power requirements

DC 3.3 V, 300 mA

Modulation method

DSSS

Dimensions (approx.)

30 mm × 9 mm × 60 mm (1 3/16 in × 3/8 in × 2 3/8 in) (w/h/d) 

Mass (approx.)

10 g (3/8 oz)

* It is possible to input these formats only with HDMI connection.

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 –

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)

0  OR  DOTTED  LINE  

0  ON  THE  SCHEMATIC  DIAGRAMS  AND  IN  

0  SUR  

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 & DTS-HD Master Audio is a trademark 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.

“x.v.Color” and “x.v.Color” logo are trademarks of Sony Corporation.

The N Mark is a trademark or registered trademark of NFC Forum, Inc. in the 
United States and in other countries.

Android is a trademark of Google Inc.

© 2012 CSR plc and its group companies.
The aptX® mark and the aptX logo are trade marks of CSR plc or one of its 
group companies and may be registered in one or more jurisdictions.

Other trademarks and trade names are those of their respective owners.

Design and specifications are subject to change without notice 

Standby power consumption: 0.5 W 
or less (Bar Speaker), 0.5 W or less 
(Subwoofer)
Over 85% power efficiency of 
amplifier block is achieved with the 
full digital amplifier, S-Master.

4096 × 2160p @ 23.98/24 Hz

3840 × 2160p @ 29.97/30 Hz

3840 × 2160p @ 25 Hz

3840 × 2160p @ 23.98/24 Hz

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 

Grille frame (1)
Remote control (1)
R03 (size AAA) batteries (2)
Digital optical cable for a TV (1)
IR blaster (1)
Stands (2) and screws (2)
Wireless transceivers (2)
Operating Instructions (1)
Reference Guide (1)

 .............................................  

4

2-1. Disassembly 

Flow 

...........................................................   6

2-2. Panel 

(L/R) 

Assy 

.............................................................   7

2-3.  Panel (Rear L) Block, Panel (Rear R) .............................   7
2-4.  Bracket (Arm A/B) Assy, Fuse (F501) ............................   8
2-5. Bracket 

(Air) 

Assy 

..........................................................   8

2-6.  Bracket (Bottom) Block ..................................................   9
2-7.  Power Cord (AC1) ..........................................................   10
2-8. Chassis 

Block 

..................................................................  11

2-9. POWER 

Board 

................................................................  12

2-10. AMP Board .....................................................................   12
2-11. IO Board .........................................................................   13
2-12. MAIN Board ...................................................................   13
2-13.  Center Speaker Block .....................................................   14
2-14.  Loudspeaker (6.5 cm) (SP5, SP6, SP7, SP8, SP9) .........   15
2-15.  Cable with Connector (SPC3) .........................................   16
2-16.  Cable with Connector (SPC4) .........................................   16
2-17. RC-S801/A (NFC1) ........................................................   17
2-18.  Bluetooth Module (BT1) ................................................   18
2-19.  Front Speaker (L) Block .................................................   19
2-20.  Loudspeaker (6.5 cm) (SP3) (L-ch) ................................   19
2-21.  Loudspeaker (2 cm) (SP1) (L-ch) ...................................   20
2-22.  Cable with Connector (SPC1) (L-ch) .............................   21
2-23.  Front Speaker (R) Block .................................................   22
2-24. DISPLAY Board .............................................................   23
2-25.  Loudspeaker (6.5 cm) (SP4) (R-ch) ................................   23
2-26.  Loudspeaker (2 cm) (SP2) (R-ch) ...................................   24
2-27.  Cable with Connector (SPC2) (R-ch) .............................   25
2-28. KEY Board ......................................................................   26
2-29.  Flexible Flat Cable (14P) (FFC1) ...................................   26

 ............................................................   27

4-1.  Block Diagram - HDMI Section - ...................................   30
4-2.  Block Diagram - MAIN Section - ...................................   31
4-3.  Block Diagram - AMP Section - .....................................   32
4-4. Block 

Diagram 

- PANEL/POWER SUPPLY Section - ............................   33

4-5.  Schematic Diagram - MAIN Board (1/7) - .....................   35
4-6.  Schematic Diagram - MAIN Board (2/7) - .....................   36
4-7.  Schematic Diagram - MAIN Board (3/7) - .....................   37
4-8.  Schematic Diagram - MAIN Board (4/7) - .....................   38
4-9.  Schematic Diagram - MAIN Board (5/7) - .....................   39
4-10.  Schematic Diagram - MAIN Board (6/7) - .....................   40
4-11.  Schematic Diagram - MAIN Board (7/7) - .....................   41
4-12.  Printed Wiring Board - MAIN Board - ...........................   42
4-13.  Printed Wiring Board - AMP Board - .............................   43
4-14.  Schematic Diagram - AMP Board (1/2) - .......................   44
4-15.  Schematic Diagram - AMP Board (2/2) - .......................   45
4-16.  Printed Wiring Board - IO Board - .................................   46
4-17.  Schematic Diagram - IO Board - ....................................   47
4-18.  Printed Wiring Boards - PANEL Section - .....................   48
4-19.  Schematic Diagram - PANEL Section - ..........................   49
4-20.  Printed Wiring Board - POWER Board - ........................   50
4-21.  Schematic Diagram - POWER Board - ..........................   51

5-1. Panel 

Section 

...................................................................  66

5-2.  Bracket (Bottom) Section ...............................................   67
5-3.  Power Cord Section ........................................................   68
5-4. Chassis 

Section 

...............................................................  69

5-5.  Front Block Section ........................................................   70
5-6.  Front Speaker (L) Section ...............................................   71
5-7.  Center Speaker Section ...................................................   72
5-8.  DISPLAY Board Section ................................................   73
5-9.  Front Speaker (R) Section ...............................................   74
5-10.  Front Panel Section .........................................................   75

 ..............................   76

Accessories are given in the last of the electrical parts list.

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)

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-ST7 (SA-ST7/SA-WST7/EZW-
RT50) are required to confi rming operation of SA-ST7. 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.

NOTE  OF  REPLACING  THE  IC3506  ON  THE  MAIN  
BOARD
IC3506 on the MAIN board cannot exchange with single. When 
this part is damaged, exchange the complete mounted board.

NOTE  OF  REPLACING  THE  IC3001, IC3003, IC3005  
AND  IC3007  ON  THE  AMP  BOARD  AND  THE  COM-
PLETE  AMP  BOARD
When IC3001, IC3003, IC3005 and IC3007 on the AMP board and 
the complete AMP board are replaced, it is necessary to spread the 
compound between the AMP board and the heat sink.
Spread the compound referring to the fi gure below.

CAPACITOR  ELECTRICAL  DISCHARGE  PROCESSING 
When checking the board, for the electric shock prevention, con-
nect the resistors to both ends of respective capacitor (C519) to 
discharge the capacitor (C519).

:/2 W

ABOUT  THE  PAIRING  METHOD
When the following replacing repair is performed, the pairing of 
the Bar speaker (SA-ST7) and Subwoofer (SA-WST7) is cut.

•   Replacing of complete MAIN board
•   Replacing of IC1002 on the MAIN board

Return the Bar speaker (SA-ST7) and Subwoofer (SA-WST7) to 
the customer after performing the pairing according to the follow-
ing procedure.

Preparation:
Insert the wireless transceivers (EZW-RT50) into the Bar speaker 
(SA-ST7) and Subwoofer (SA-WST7).

1  Connect the AC power cords (mains leads).  
2 Press 

the 

 button on the Bar Speaker.

3 Confirm 

the 

 indicator of the subwoofer is lit 

in green. If not, the wireless transmission is not 
activated.

 indicator is off:

– Check that the AC power cord (mains lead) of the subwoofer is connected

securely.

– Turn the subwoofer on by pressing the 

 button on the subwoofer.

 indicator flashes in green quickly:

First press the 

 button on the subwoofer, then insert the wieless transceiver 

into the subwoofer correctly, and press the 

 button on the subwoofer again.

 indicator flashes in red: 

If the

If the

If the

Make sure the AC power cord (mains lead) of the subwoofer is connected.
Make sure the wireless transceivers are inserted correctly.

Press the

 button to turn off the subwoofer, and check that nothing is  

blocking the ventilation holes of the subwoofer.