Sharp CD-DK890N Service Manual download pdf (Page 2)

CD-DK890N

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AudioXL-MP150Service ManualXLMP150MarketE

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

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

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 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.

Description

Parts No.

PWB-A 92LPWB7312MANS MAIN (A1), POWER (A2)

PWB-B 92LPWB7312DPLS DISPLAY (B1), AUDIO IN (B2), iPOD TRANSIT (B3)

PWB-C 92LPWB7312PODS iPOD

PWB-D 92LPWB6700CDUS CD

"MAIN, POWER, DISPLAY, AUDIO IN, iPOD TRANSIT, iPOD, CD 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.

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

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Sharp CD-DK890N Service Manual Page 2