PCM-D50 - 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.

•  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.

•  Never reuse a disconnected chip component.

•  Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

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 
WHOSE  PART  NUMBERS  APPEAR  AS  SHOWN  IN  THIS 
MANUAL  OR  IN  SUPPLEMENTS  PUBLISHED  BY  SONY.

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  COM-  POSANTS  QUE 
PAR  DES  PIÈCES  SONY  DONT  LES  NUMÉROS  SONT  DON-
NÉS  DANS  CE  MANUEL  OU  DANS  LES  SUPPLÉMENTS 
PUBLIÉS  PAR  SONY.

Danger of explosion if battery is incorrectly replaced.

Replace only with the same or equivalent type.