1 - 4
1-5 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) Characteristics of lead-free solder
The melting point of lead-free solder is 30-40°C higher than that of lead based solder.
Point to be soldered
Tip temperature
Surface-mounted (chip) parts [other than
those shown below]
320 ± 30°C
[heating time: less than 5 seconds]
Surface-mounted (chip) parts [for DVD
cameras, cellular phones only]
350 ± 10°C
[heating time: less than 3 seconds]
Discrete parts
380 ± 30°C
Chassis, metal shield, etc.
420 ± 30°C
(2) 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.
(3) 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:
Safety Precaution for Repair > Lead-Free Solder
(4) Cautions when using lead based solder
It is recommended that you use lead-free solder when servicing, but it is also possible to service
using lead based solder. However, if lead based solder is used for servicing, take care with the
following:
1) Before using lead based solder, remove the lead-free solder completely from the point to be
soldered.
2) For additional soldering for repair, set the soldering iron tip temperature for lead-free solder,
mix lead based solder and lead-free solder suffi ciently. Do not perform any repair using the
bare soldering iron tip without adding solder, since it will cause secondary failure due to lack of
strength.