Sharp VE-CG30U Service Manual page 3

I PRECAUTIONS FOR USING LEAD-FREE SOLDER
1) Employing lead-free solder
"Main PWB", "Camera head PWB", "Audio I/O PWB", "Card PWB", "Inverter PWB", "Operation PWB", "DC Jack
PWB", "CCD 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 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°C, we recommend you
to use a dedicated soldering bit. If you are not familiar with how to obtain lead-free solder or soldering bit, contact
our service station or service ranch in your area.
3) Soldering
As the melting point of lead-free solder (Sn-Ag-Cu) is 220°C which is higher than the conventional lead solder by
40°C, and as it has poor solderability, 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.
Lead-free wire solder for servicing
#
Part No.
ZHNDAi123250E J
ZHNDAi126500E J
ZHNDAi12801KE J
Indicates lead-free solder of tin, silver and copper
Description Price Code
φ0.3mm 250g(1roll)
φ0.6mm 500g(1roll)
φ1.0mm
1kg(1roll)
BL
BK
BM
3
VE-CG30U
VE-CG40U