Safety Precaution for Repair > Lead-Free Solder

1-4 Lead-Free Solder

The printed circuit board that uses lead-free solder is adopted. To protect the global environment, use the recommended lead-free solder also during servicing.

Read and observe the following before soldering:

Caution

ALWAYS wear protective goggles during soldering so that no solder smoke or scattered solder enters the eye. Lead-free solder may scatter at high temperatures of 600°C.

(1) Identification of circuit boards that use lead-free solder

“F” is stamped or noted with pattern letter on circuit boards that use lead-free solder.

(2) Characteristics of lead-free solder

The components of lead-free solder used are as follows. The melting point of lead-free solder is 30- 40°C higher than that of lead based solder:

Point to be soldered

For reflow

For dip

Composition of alloy (wt%)

Solder paste: Sn-3Ag-0.5Cu

Bar solder: Sn-0.6Cu

Melting temperature: Approx. 220°C

(3) Lead-free solder for servicing

Use the following lead-free solder for servicing:

Recommended lead-free solder and composition of alloy (wt%): Sn-3.0Ag-0.5Cu or equivalent

Information:

For composition of alloy, Sn is tin; Ag is silver; Cu is copper; Bi is bismuth; Pb is lead.

(4) Soldering iron for servicing

The temperature of soldering iron tip must be adjusted according to the points to be soldered: Use an antistatic soldering iron with thermal control function.

When removing components, take care not to damage any surrounding component or pattern. When attaching components, observe the heating time in the following table so that the components are not destroyed by heat.

Tip temperatures for different soldering points:

Point to be soldered

Tip temperature

 

 

Surface-mounted (chip) parts [other than

320 ± 30°C

those shown below]

[heating time: less than 5 seconds]

Surface-mounted (chip) parts [for DVD

350 ± 10°C

cameras, cellular phones only]

[heating time: less than 3 seconds]

Discrete parts

380 ± 30°C

Chassis, metal shield, etc.

420 ± 30°C

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Hitachi Lead-Free Solder, Identification of circuit boards that use lead-free solder, Characteristics of lead-free solder

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