MEX-BT3900U, MEX-BT3950U, MEX-BT39UW - Sony Car Audio Service Manual (repair manual). Page 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.

FLEXIBLE  CIRCUIT  BOARD  REPAIRING
• 

Keep the temperature of soldering iron around 270 °C during 
repairing.

• 

Do not touch the soldering iron on the same conductor of the 
circuit board (within 3 times).

• 

Be careful not to apply force on the conductor when soldering 
or unsoldering.

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 

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.

CAUTION
Use of controls or adjustments or performance of procedures 
other than those specifi ed herein may result in hazardous radia-
tion exposure.

• US and Canadian models:
CAUTION
The use of optical instruments with this 
product will increase eye hazard.

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.

ZAPPIN and Quick-BrowZer are trademarks of 
Sony Corporation.

HD Radio

TM

 is a proprietary trademark of 

iBiquity Digital Corp.

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.

Windows Media is either a registered trademark 
or trademark 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.

iPhone, iPod, iPod classic, iPod nano, and
iPod touch 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.

x Except US and Canadian models:

This label is located on the bottom of the
chassis.