TA-A1ES - Sony Audio Service Manual (repair manual). Page 4

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.

DESTINATION  IDENTIFICATION
Distinguish by Part No. on the rear side of a main unit.

US and Canadian models

4-467-226-1[]

AEP and UK models

4-467-226-2[]

There is something wrong with the amplifier. It might be because of 
a short circuit of the speaker output, a short circuit of the 
headphones output, or because the ventilation holes on the top of 
the amplifier are blocked. Resolve the problem, then turn on the 
amplifier again.

NOTE  OF  OPERATION  CHECK
When performing the operation, be sure not to remove the wire connected to the Ref No. ET160 (GND) on the P-REG board.