XL-DAB (serv.man2) - Sharp Audio Service Manual (repair manual). Page 2

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XL-DAB151PH
 – 2
 
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.
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 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 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.
"MAIN, POWER, DISPLAY, SPEAKER/JACK, AUDIO IN, USB, iPod, KEY 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.
PRECAUTIONS FOR USING LEAD-FREE SOLDER
PWB-A 92L36101512011 MAIN
PWB-B 92L36801512010 POWER
PWB-C 92L36501512010 DISPLAY
PWB-D 92L36401512011 SPEAKER/JACK
PWB-E 92L37101512011 AUDIO 
IN
PWB-F 92L36901512011 USB
PWB-G 92L36601512010 iPod
PWB-H 92L37201512011 KEY
i
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