SRS-BTV25 - Sony Audio Service Manual (repair manual). Page 3

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.

NOTE  THE  IC101,  IC304  AND  Q901  ON  THE  MAIN  
BOARD  REPLACING
IC101, IC304 and Q901 on the MAIN board cannot exchange 
with single. When these parts are damaged, exchange the complete 
mounted board.

NOTE  THE  BT  BOARD  REPLACING
When the BT board is defective, exchange the complete mounted 
board.

NOTE  THE  JACK  BOARD  REPLACING
When the JACK board is defective, exchange the BATTERY 
HOLDER (SV) ASSY (for Black) or the BOTTOM FRAME (SV) 
ASSY (for White).

NOTE  THE  USB  BOARD  REPLACING
When the USB board is defective, exchange the BATTERY 
HOLDER (SV) ASSY (for Black) or the BOTTOM FRAME (SV) 
ASSY (for White).