Sharp Aquos LC-42D72U, Service Manual

Page: 4 / 162

LC-42D72U
iii
PRECAUTIONS FOR USING LEAD-FREE SOLDER
„ Employing lead-free solder
• “PWBs” 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:
„ 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 dam-
age 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 wire solder or soldering bit, contact our service station or service branch in your area.
„ Soldering
• As the melting point of lead-free solder (Sn-Ag-Cu) is about 220
°
C which is higher than the conventional lead solder 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.
• Be careful when replacing parts with polarity indication on the PWB silk.
Lead-free wire solder for servicing
Indicates lead-free solder of tin, silver and copper. Indicates lead-free solder of tin, silver and copper.
PARTS CODE
PRICE
RANK
PART
DELIVERY
DESCRIPTION
ZHNDAi123250E BL J
φ
0.3mm 250g (1roll)
ZHNDAi126500E BK J
φ
0.6mm 500g (1roll)
ZHNDAi12801KE BM J
φ
1.0mm 1kg (1roll)