Read Sharp XL-UH220H (serv.man4) Service Manual online
XL-UH220H
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PRECAUTIONS FOR USING LEAD-FREE SOLDER
1. Employing lead-free solder
Example:
Indicates lead-free solder of tin, silver and copper.
Lead-free wire solder for servicing
Ref No.
Description
Parts No.
PWB-A
92LPWB6483MANS
92LPWB6475CDUS
PWB-C
MAIN (A1), POWER (A2), SPEAKER (A3)
PWB-B
92LPWB6483DPLS
DISPLAY (B1), USB (B2), JACK (B3), LED (B4), SUB (B5)
CD MP3
CD MP3
PWB-D
QPWBF0027AWZZ
CD MOTOR (PWB ONLY)
PWB-E
QPWBF1055AWZZ
CD CHANGER (PWB ONLY)
"MAIN, POWER, SPEAKER, DISPLAY, USB, JACK, LED, SUB, CD MP3, CD MOTOR (PWB ONLY), CD
CHANGER (PWB ONLY)" 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.
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.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.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 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 of for 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
bit as required. If a different type of solder stays on the tip of the soldering bit,it
Clean the bit after every use of it. When the tip of the soldering bit is blackened
or fine sand paper. Be careful when replacing parts with polarity indication on
i
to turn on and off the power of the
is alloyed with lead-free solder.
during use, file it with steel wool
the PWB silk.
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