Lead Free Soldering Guide - Hitachi C43-FL9000 Service Manual

LEAD FREE SOLDERING GUIDE

● Lead free solder
With some exception, this product is going to use lead free solder (unleaded) to help preserve the
environment from the September of 2004. Please read these instructions before attempting any soldering
work.
Caution:
Always wear safety glasses to prevent fumes or molten solder from getting into the eyes.
Lead free solder can splatter at high temperatures. (600ºC).
■ Lead free solder indicator
There is a F mark made behind the name of PWB or close to its on the printed circuit boards with lead free
solder.
■ Properties of lead free solder
The melting point of lead free solder is 40--50ºC higher than lead solder.
■ Servicing solder
Unleaded solder with an alloy composition of Sn-3.0Ag-0.5Cu is recommended. Although servicing with
leaded solder is possible, there are a few precautions that have to be taken. (Not taking these precautions
may cause the solder to not harden properly, and lead to consequent malfunctions.)
■ Precautions when using leaded solder
● Remove all lead free solder from soldered dots when replacing components.
● If leaded solder should be added to existing unleaded soldered dots , melt the leaded solder thoroughly
and mix it in the unleaded solder after the unleaded soldered dots have been completely melted. (It's not
permitted to solder directly with soldering iron without solder)
■Servicing soldering iron
A soldering iron with a temperature setting capability (temperature control function) is recommended. The
melting point of unleaded soldering tin is higher than that of leaded ones. Use a soldering iron that maintains
a high stable temperature (large heat capacity) and allows temperature adjustment according to the parts
awaiting serviced to avoid poor servicing performance.
■ Recommended soldering iron
● Soldering iron with temperature control function (temperature range:320--450ºC)
Recommended temperature range per part:
PARTS
Mounting (chips) on mounted PCB
Mounting (chips) on empty PCB
Chassis, metallic shield, etc.
Soldering iron temperature
320ºC±30ºC
380ºC±30ºC
420ºC±30ºC
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