Precautions For Using Lead-Free Solder - Sharp HT-DV40H Service Manual

HT-DV40H
Audio E Market XLMP150 Service Manual XL-MP150

PRECAUTIONS FOR USING LEAD-FREE SOLDER

1. Employing lead-free solder
"MAIN, POWER, DISPLAY, SCART, VIDEO OUT, DIGITAL IN, DVD, SUBWOOFER PWB" of this model employs
lead-free solder.
The LF symbol indicates lead-free solder, and is attached on the PWB 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 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.
3. 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 wet ability, 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 corrected. 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
Ref No.
PWB-A 92LPWB6891MANS
PWB-B 92LPWB6891PWRS
PWB-C 92LPWB6891DVDS
PWB-C 92LPWB6966DVDS
PWB-C 92LPWB6968DVDS
PWB-C 92LPWB7098DVDS
PWB-D 92LPWB6891SWFS
Indicates lead-free solder of tin, silver and copper.
Parts No.
MAIN
POWER (B1), DISPLAY (B2), SCART (B3), VIDEO OUT (B4), DIGITAL IN (B5)
DVD [ For Singapore-Export, Middle East / Africa ]
DVD [ For Australia ]
DVD [ For India ]
DVD [ For Central & South America ]
SUB WOOFER
Description
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