DSX-S300BTX - Sony Car Audio Service Manual (repair manual)

2010G05-1

© 

2010.07

•  This model is not equipped with a mechanism deck.

Tuning range: 87.5 – 107.9 MHz
Antenna (aerial) terminal: 

External antenna (aerial) connector

Intermediate frequency: 150 kHz
Usable sensitivity: 10 dBf
Selectivity: 75 dB at 400 kHz
Signal-to-noise ratio: 70 dB (mono)
Separation: 40 dB at 1 kHz
Frequency response: 20 – 15,000 Hz

Tuning range: 530 – 1,710 kHz
Antenna (aerial) terminal: 

External antenna (aerial) connector

Intermediate frequency: 25 kHz
Sensitivity: 26 μV

CEA2006 Standard
Power Output: 17 Watts RMS 
4 Ohms < 1% THD+N 
SN Ratio: 80 dBA 
(reference: 1 Watt into 4 Ohms)

4 at 

Interface: USB (High-speed)
Maximum current: 500 mA

Bluetooth Standard version 2.1 + EDR

Bluetooth Standard Power Class 2 (Max. +4 dBm)

Line of sight approx. 10 m (33 ft)*

1

2.4 GHz band (2.4000 – 2.4835 GHz)

Modulation method: FHSS
Compatible Bluetooth Profiles*

2

A2DP (Advanced Audio Distribution Profile) 1.2
AVRCP (Audio Video Remote Control Profile) 1.3
HFP (Handsfree Profile) 1.5
PBAP (Phone Book Access Profile)
OPP (Object Push Profile)

*1 The actual range will vary depending on factors 

*2 Bluetooth standard profiles indicate the purpose of 

Output: Speaker outputs
Speaker impedance: 4 – 8 ohms
Maximum power output: 52 W 

× 4 (at 4 ohms)

Outputs: 

Audio outputs terminal (front/rear)
Subwoofer output terminal (mono)
Power antenna (aerial) relay control terminal
Power amplifier control terminal

Inputs: 

Remote controller input terminal
Antenna (aerial) input terminal
Telephone ATT control terminal
Illumination control terminal
BUS control input terminal (US and Canadian models)
BUS audio input terminal (US and Canadian models)
USB signal input connector (internal/external)
MIC input terminal

 12 V DC car battery 

(negative ground (earth))

Dimensions: Approx. 178 

× 50 × 180 mm 

(7

1

/

8

 

× 2 × 7

1

/

8

 in) (w/h/d)

Mounting dimensions: Approx. 182 

× 53 × 163 mm 

(7

1

/

4

 

× 2

1

/

8

 

× 6

1

/

2

 in) (w/h/d)

Mass: Approx. 1.1 kg (2 lb 7 oz)
Supplied accessories: 

Card remote commander: RM-X306 (US and Canadian models)

RM-X305 (AEP, Italian and UK models)
RM-X307 (E model)

USB connector for iPod: XA-50IP
Parts for installation and connections (1 set)
CD-ROM (Application disc)

Your dealer may not handle some of the above listed 
accessories. Please ask the dealer for detailed 
information.

Tuning range: 87.5 – 108.0 MHz
Antenna (aerial) terminal: 

External antenna (aerial) connector

Intermediate frequency: 150 kHz
Usable sensitivity: 10 dBf
Selectivity: 75 dB at 400 kHz
Signal-to-noise ratio: 70 dB (mono)
Separation: 40 dB at 1 kHz
Frequency response: 20 – 15,000 Hz

Tuning range: 

MW: 531 – 1,602 kHz
LW: 153 – 279 kHz

Antenna (aerial) terminal: 

External antenna (aerial) connector

Intermediate frequency: 25 kHz
Sensitivity: MW: 26 μV, LW: 45 μV

87.5 – 108.0 MHz (at 50 kHz step)
87.5 – 108.0 MHz (at 100 kHz step)
87.5 – 107.9 MHz (at 200 kHz step)

FM tuning step: 50 kHz/100 kHz/200 kHz switchable
Antenna (aerial) terminal: 

External antenna (aerial) connector

Intermediate frequency: 150 kHz
Usable sensitivity: 10 dBf
Selectivity: 75 dB at 400 kHz
Signal-to-noise ratio: 70 dB (mono)
Separation: 40 dB at 1 kHz
Frequency response:

 20 – 15,000 Hz

Tuning range: 

531 – 1,602 kHz (at 9 kHz step)
530 – 1,710 kHz (at 10 kHz step)

AM tuning step: 9 kHz/10 kHz switchable
Antenna (aerial) terminal: 

External antenna (aerial) connector

Intermediate frequency: 25 kHz
Sensitivity: 26 μV

  .............................................   3

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

6

3-1. Disassembly 

Flow 

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

3-2.  Top Cover Block .............................................................   12
3-3. Tray 

Assy 

........................................................................  13

3-4.  Sub Panel Complete Assy ...............................................   13
3-5. MAIN 

Board 

...................................................................  14

3-6. Volume 

Knob 

..................................................................  14

 ............................................................   15

5-1.  Block Diagram - AUDIO Section (1/2) - ........................   16
5-2.  Block Diagram - AUDIO Section (2/2) - ........................   17
5-3. Block 

Diagram 

 

- PANEL, POWER SUPPLY Section - ...........................   18

5-4.  Printed Wiring Board - MAIN Section (1/2) - ................   20
5-5.  Printed Wiring Boards - MAIN Section (2/2) - ..............   21
5-6.  Schematic Diagram - MAIN Section (1/6) - ...................   22
5-7.  Schematic Diagram - MAIN Section (2/6) - ...................   23
5-8.  Schematic Diagram - MAIN Section (3/6) - ...................   24
5-9.  Schematic Diagram - MAIN Section (4/6) - ...................   25
5-10.  Schematic Diagram - MAIN Section (5/6) - ...................   26
5-11.  Schematic Diagram - MAIN Section (6/6) - ...................   27
5-12.  Printed Wiring Board - SUB Board - ..............................   28
5-13.  Schematic Diagram - SUB Board - .................................   28
5-14.  Printed Wiring Board - DISPLAY Board - .....................   29
5-15.  Schematic Diagram - DISPLAY Board - ........................   30

6-1. Main 

Section 

...................................................................  42

6-2.  Front Panel Section .........................................................   43
6-3.  Sub Panel Section ...........................................................   44

  ..............................   45

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

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.

The “SAT Radio Ready” 
logo indicates that this 
product will control a satellite 
radio tuner module (sold 

separately). Please see your nearest authorized 
Sony dealer for details on the satellite radio 
tuner module.
“SAT Radio,” “SAT Radio Ready,” the SAT 
Radio and SAT Radio Ready logos and all 
related marks are trademarks of Sirius XM 
Radio Inc. and XM Satellite Radio Inc.

ZAPPIN and Quick-BrowZer are trademarks of 
Sony Corporation.

12 TONE ANALYSIS and its 
logo are trademarks of Sony 
Corporation.

“WALKMAN” and 
“WALKMAN” logo are 
registered trademarks of 
Sony Corporation.

SensMe and the SensMe logo are 
trademarks or registered 
trademarks of Sony Ericsson 
Mobile Communications AB.

Music recognition technology and related data are 
provided by Gracenote®. Gracenote is the industry 
standard in music recognition technology and 
related content delivery. For more information, 
please visit www.gracenote.com. 

CD and music-related data from Gracenote, Inc., 
copyright © 2000-2010 Gracenote. Gracenote 
Software, copyright © 2000-2010 Gracenote. This 
product and service may practice one or more of 
the following U.S. Patents: #5,987,525; 
#6,061,680; #6,154,773, #6,161,132, #6,230,192, 
#6,230,207, #6,240,459, #6,330,593, and other 
patents issued or pending. Some services supplied 
under license from Open Globe, Inc. for U.S. 
Patent: #6,304,523. 

Gracenote and CDDB are registered trademarks of 
Gracenote. The Gracenote logo and logotype, and 
the “Powered by Gracenote” logo are trademarks 
of Gracenote.

The Bluetooth word mark and logos are owned 
by the Bluetooth SIG, Inc. and any use of such 
marks by Sony Corporation is under license. 
Other trademarks and trade names are those of 
their respective owners.

Microsoft, Windows, Windows 
Vista and Windows Media and 
logos are trademarks or 
registered trademarks of 
Microsoft Corporation in the 

United States and/or other countries.

This product is protected by certain intellectual 
property rights of Microsoft Corporation. Use or 
distribution of such technology outside of this 
product is prohibited without a license from 
Microsoft or an authorized Microsoft subsidiary.

iPod is a trademark of Apple Inc., registered in 
the U.S. and other countries.

iPhone is a trademark of Apple Inc.

Apple, Macintosh and iTunes are trademarks of 
Apple Inc., registered in the U.S. and other 
countries.

MPEG Layer-3 audio coding technology and 
patents licensed from Fraunhofer IIS and Thomson.

HD Radio

TM

 is a proprietary trademark of 

iBiquity Digital Corp

IMPORTANT  NOTE  OF  “INITIALIZING”
The purpose of “Bluetooth Initialize” is to initialize the Bluetooth 
connection history (HF/Audio Streaming). (To delete the device 
information for the devices that you connected to when searching, 
etc.)
When the BT board or MAIN board (including BT board) are re-
placed, it is necessary to initialize this set.
Refer to the following, initialize this set.

Note: Phonebook data and dialed/received call history can be deleted by 

executing “Reset.”

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.

Under normal conditions, the battery will last approximately 1 year. 
(The service life may be shorter, depending on the conditions of use.)
When the battery becomes weak, the range of the card remote commander 
becomes shorter. Replace the battery with a new CR2025 lithium battery. 
Use of any other battery may present a risk of fire or explosion.

D

Notes on the lithium battery
• Keep the lithium battery out of the reach of children. Should the battery be 

• Wipe the battery with a dry cloth to assure a good contact.
• Be sure to observe the correct polarity when installing the battery.
• Do not hold the battery with metallic tweezers, otherwise a short-circuit 

Battery may explode if mistreated.
Do not recharge, disassemble, or dispose of
in fire.

You can initialize all the Bluetooth-related 
settings from this unit.

Press and hold the multi way encoder.
The menu list appears.

Rotate the multi way encoder to select 
“BT Initialize,” then press it.
The confirmation appears.

Rotate the multi way encoder to select 
“Yes.”
“Initializing...” appears while initializing the 
Bluetooth settings.

The display returns to normal reception/play 
mode.

ABOUT  THE  BT  BOARD  REPLACEMENT
When repairing, the complete BT board should be replaced since 
any parts in the BT board cannot be repaired.

NOTE  FOR  THE  24-PIN  CONNECTOR (CN901)
Do not use alcohol to clean the 24-pin connector (CN901) connect-
ing the front panel with the main body.
Do not touch the connector directly with your bare hand. Poor con-
tact may be caused.

NOTE  FOR  CHECKING  THE  MAIN  BOARD
If removing the MAIN board from the chassis to check it sepa-
rately without attaching the front panel, hold the detach detection 
switch (S702) ON by using tape or the like, and then start opera-
tions.

You can cancel the demonstration display which 
appears during turning off.

Press and hold the multi way encoder.
The setup display appears.

Press and hold the multi way encoder.
The setup is complete and the display returns 
to normal reception/play mode.

Note: Depending on the connecting device, Signal-strength/Battery-re-

maining indications might not be displayed.

 

  Or, depending on the connecting device, the levels of indications are 

shown incorrectly.

 

  Even if you see no indications or wrong indications, they are not 

failures of DSX-S300BTX.

1.  Search for this set from the Bluetooth device (cellular phone), 

and confi rm whether this set (“Sony Automotive”) is dis-
played.

2.  Search for the distance of this set and the Bluetooth device 

(cellular phone) about 5 m apart.

 Confi rm whether the Bluetooth device (or this set) is displayed 

after it searches.

3.  Do the pairing of the cellular phone and this set (input of pass 

code).

4.  Connect the cellular phone with this set, and confi rm the “HF” 

icon lights.

5. Confi rm the connection continues even if the distance of the 

cellular phone and this set is separated by about 5 m.

6.  Set this set besides the “Bluetooth Phone” source, and call the 

cellular phone connected with this set.

 Confi rm the automatic change of this set into “Bluetooth 

Phone” source, and the change into the screen for incoming 
calls.

 Confi rm the ring tone is heard from the speaker.
7.  Take a phone call (press the encoder switch), and start a con-

versation.

 Confi rm the other person voice is heard from the speaker.
 

Speak toward the microphone of this set, and confi rm whether 
the other party hears its voice (At the external microphone 
noncontact).

 

Compare the sound quality with a normal set. Confi rm  that 
there is no big difference.

8.  Speak toward an external microphone at the following condi-

tion, and confi rm the other party hears its voice.

•  An external microphone is connected.
9.  Turn on ACC from off, and confi rm whether this set connects 

Bluetooth with the cellular phone again.

Note: Depending on the cellular phone, it might not reconnect automati-

cally when ACC is turned on.

Note: Depending on the connecting BT Audio device, track information 

(e.g. track name, playback time) can be on display.

 

If the device doesn’t support AVRCP1.3, or, if AVRCP1.3 feature of 
the device has not been validated with DSX-S300BTX;   

 

the track information won't be shown.

 

Even if there is no track information on display during playback of 
an AVRCP1.3 device, it is not a failure of DSX-S300BTX.

1.  Connect the Bluetooth audio device (or cellular phone with 

Bluetooth audio function) with this set, and confi rm the “Au-
dio Streaming” icon lights.

2.  Playback Bluetooth audio. Confi rm the sound is emitted from 

this set when this set is switched to “Bluetooth Audio” source.

3. Confi rm whether Bluetooth audio can be controlled by operat-

ing this set (the Multi way encoder left/right, [PAUSE] keys 
operation).

Note: Varies depending on the connected Bluetooth audio device.

8.  What to Do after Checking
•  After checking, select “BT Initialize” from the menu list of this 

set to execute initialization.

 

(Connected device information is deleted.)

BLUETOOTH  FUNCTION  CHECKING  METHOD  USING  
A  CELLULAR  PHONE
1. Required Equipment
•  Set to be tested (DSX-S300BTX), external microphone of at-

tachment (XA-MC10) if necessary

•  Cellular phone (Recommended SEMC W880 or W910i, or se-

lect from connectable cellular phones list)

•  Bluetooth audio devices (SONY NWZ-A826, or select from 

connectable cellular phones/audio devices list)

•  Speaker connection (at least Front L/R ch)
•  DC power supply (12 V)

2. Preparation
• Confi rm the setting of the DSX-S300BTX, and notate it.
•  Press and hold the BLUETOOTH button and confi rm that the 

Bluetooth icon ( ) is fl ashing.

•  Turn on the Bluetooth function of the cellular phone.

3. Test Environment
•  No other Bluetooth device is making a communication in the 

periphery (within 20 m).

•  No other DSX-S300BTX are supplied with electric power.
•  There are no two or more wireless LAN access points in the 

periphery (with 50 m) (one is OK).

•  The set should be tested in a place such as a meeting room, free 

from ambient noise.

•  The speaker at the far end should be in a place such as another 

meeting room separated acoustically.

4. Setting
Install the DSX-S300BTX on the desktop.

5. Precautions
Beware of the following points when conducting the 
talking test:
•  There is no fault if a talking can be made by adjusting appro-

priately the volume of the telephone of the other party and the 
cellular phone connected through the Bluetooth, besides the 
setup of DSX-S300BTX.

•  The speaker’s voice will become loud naturally if the periph-

ery is noisy, or become low if quiet (even though the speaker 
intents to talk on the same volume level).

•  The speaker’s voice will become loud naturally if the other 

party’s voice is loud.