Sharp XL-UH260 Service Manual - Page 2

Precautions For Using Lead-free Solder - manual

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XL-UH260 PRECAUTIONS FOR USING LEAD-FREE SOLDER 1. Employing lead-free solder "MAIN, POWER, SPEAKER, REFLASH MICOM, DISPLAY, USB, JACK, LED, SUB, CD MP3, SPEAKER LED PWB, 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. 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.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 nto 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 oftime. 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 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 sand paper. Be careful when replacing parts with polarity indication on the PWB silk. Lead-free wire solder for servicing Ref No. Parts No. PWB-A 92LPWB6480MANS Description MAIN (A1), POWER (A2), SPEAKER (A3), REFLASH MICOM (A4) PWB-B PWB-C PWB-D 92LPWB6480DPLS 92LPWB6475CDUS 92LPWB6274LEDS DISPLAY (B1), USB (B2), JACK (B3), LED (B4), SUB (B5) CD MP3 SPEAKER LED PWB-E PWB-F QPWBF0027AWZZ QPWBF1055AWZZ CD MOTOR (PWB ONLY) CD CHANGER (PWB ONLY) - i2

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XL-UH260
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
92LPWB6480MANS
92LPWB6475CDUS
PWB-C
PWB-D
MAIN (A1), POWER (A2), SPEAKER (A3), REFLASH MICOM (A4)
PWB-B
92LPWB6480DPLS
92LPWB6274LEDS
DISPLAY (B1), USB (B2), JACK (B3), LED (B4), SUB (B5)
CD MP3
SPEAKER LED
PWB-E
QPWBF0027AWZZ
CD MOTOR (PWB ONLY)
PWB-F
QPWBF1055AWZZ
CD CHANGER (PWB ONLY)
"MAIN, POWER, SPEAKER, REFLASH MICOM, DISPLAY, USB, JACK, LED, SUB, CD MP3, SPEAKER LED
PWB,
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 nto 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 oftime. 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 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 sand paper. Be careful when replacing parts with polarity indication on the PWB silk.
i