Sharp XL-UH250 Service Manual - Page 2

Eprecautions For Using Lead-free Solder

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XL-UH250 AXSMEPeRuLardE-vMrMkiiCocePAPet1U1M55T00aIOnuNaSl FOR USING LEAD-FREE SOLDER 1. Employing lead-free solder "MAIN, DISPLAY, SPEAKER, RE-FLASH MICOM, USB, JACK, LED, SUB, CD MP3, SPEAKER LED PWB, 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. Example: Indicates lead-free solder of tin, silver and copper. 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, were commend you to use a dedicated soldring 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 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. Parts No. Description PWB-A 92LPWB6656MANS MAIN (A1), POWER (A2), SPEAKER (A3), RE-FLASH MICOM (A4) PWB-B 92LPWB6656DPLS DISPLAY (B1), USB (B2), JACK (B3), LED (B4), SUB (B5) PWB-C 92LPWB6663CDUS CD MP3 PWB-D QPWBF1055AWZZ CD CHANGER (PWB ONLY) - 2i

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XL-UH250
Audio
XL-MP150
Service Manual
XLMP150
Market
E
PRECAUTIONS FOR USING LEAD-FREE SOLDER
1. Employing lead-free solder
Example:
Indicates lead-free solder of tin, silver and copper.
2. Using lead-free wire solder
3. Soldering
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.
Description
Parts No.
PWB-A
PWB-B
PWB-C
92LPWB6656MANS
92LPWB6656DPLS
92LPWB6663CDUS
MAIN (A1), POWER (A2), SPEAKER (A3), RE-FLASH MICOM (A4)
DISPLAY (B1), USB (B2), JACK (B3), LED (B4), SUB (B5)
CD MP3
PWB-D
QPWBF1055AWZZ
CD CHANGER (PWB ONLY)
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.
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, were
commend you to use a dedicated soldring 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 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 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.
"MAIN, DISPLAY, SPEAKER, RE-FLASH MICOM, USB, JACK, LED, SUB, CD MP3, SPEAKER LED PWB,
CD CHANGER (PWB ONLY)" of this model employs lead-free solder.
i