Sharp AN-37L4-T Service-Handbuch - Seite 3

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Precautions for using lead-free solder

1 Employing lead-free solder

"PWBs" of this model employs lead-free solder. The LF symbol indicates lead-free solder, and is attached on the

PWBs and service manuals. The alphabetical character following LF shows the type of lead-free solder.

Example:

F a

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 corroded. 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

Part No,

ZHNDAi123250E

ZHNDAi126500E

ZHNDAi12801KE

Indicates lead-free solder of tin, silver and copper.

Description

φ0.3mm

250g(1roll)

φ0.6mm

500g(1roll)

φ1.0mm

1kg(1roll)

Code

LC-37HV4EB, AN-37U4-B

AN-37L4-T, AN37W4K