Precautions For Using Lead-Free Solder - Electrolux E30SO75ESS Service Manual

E30SO75ESS

PRECAUTIONS FOR USING LEAD-FREE SOLDER

1. Employing lead-free solder
"Main PWB" of this model employs lead-free solder. The LF symbol indicates lead-free solder, and is attached on the
PWBs and service manuals. The alphabetical character following LF shows the type of lead-free solder.
Example:
2. Using lead-free wire solder
When fixing the PWB soldered with the lead-free solder, apply lead-free wire solder. Repairing with conventional lead
wire solder may cause damage or accident due to cracks.
As the melting point of lead-free solder (Sn-Ag-Cu) is higher than the lead wire solder by 40
use a dedicated soldering bit.
3. Soldering
As the melting point of lead-free solder (Sn-Ag-Cu) is about 220
ο
by 40 C, and as it has poor solder wettability, you may be apt to keep the soldering bit in contact with the PWB for
extended period of time. However, since the land may be peeled off or the maximum heat-resistance temperature of
parts may be exceeded, remove the bit from the PWB as soon as you confirm the steady soldering condition.
Lead-free solder contains more tin, and the end of the soldering bit may be easily corroded. Make sure to turn on and
off the power of the bit as required.
If a different type of solder stays on the tip of the soldering bit, it is alloyed with lead-free solder. Clean the bit after every
use of it.
When the tip of the soldering bit is blackened during use, file it with steel wool or fine sandpaper.
Sn-Ag-Cu
Indicates lead-free solder of tin, silver and copper.
ο
C which is higher than the conventional lead solder
30
ο
C, we recommend you to