Sharp cd sw 300 service manual

Page 2

CD-SW300
PRECAUTIONS FOR USING LEAD-FREE SOLDER

1. Employing lead-free solder
"MAIN, POWER. DISPLAY. GAME INPUT, CD SERVO, FRONT SPEAKER LED, CD MOTOR (PWB ONLY), CD
CHANGER MOTOR (PWB ONLY), SUB WOOFER LED " 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: E a

S n -Ag-C u 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. 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 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 92LPWB-‚¬514MANS MAIN (A1), POWER (A2)
PWB-B 92LPWBGS14DPLS DISPLAY (Bi), GAME INPUT (B2)
PWB-C 92LPWB6514CDUS CD SERVO
PWB-D 92LPWB6514LEDS FRONT SPEAKER LED
PWB-E QPWBF0027AWZZ CD MOTOR (PWB ONLY)
PWB-F QPWBF1055AWZZ CD CHANGER MOTOR (PWB ONLY)
PWB-H 92LPWBG230LEDS SUB WOOFER LED