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The PWB’s of thismodel employs lead-free solder. The “LF” marks indicated on the PWB’s and the Service Manual mean “Lead-Free” solder.
The alphabet following the LF mark shows the kind oflead-free solder.
(1) NOTE FOR THE USE OF LEAD-FREE SOLDER THREAD
When repairing a lead-free solder PWB, use lead-free solder thread.
Never use conventional lead solder thread, which may cause a breakdownoran accident.
Since the melting point of lead-free solder thread isabout 40°C higher thanthatofconventional lead solder thread,the use of the
exclusive-use s
oldering iron is recommendable.
(2) NOTE FOR SOLDERING WORK
Since the melting point of lead-free solder isabout 220°C, which isabout 40°C higher thanthatofconventional lead solder, and itssoldering
capacity is inferior to conventional one,itisapt to keepthe soldering iron in contact with the PWB forlonger time. Th
is may cause land
separation or may exceed the heat-resistive temperature ofcomponents. Use enough care to separate the soldering iron from the PWB when
completion ofsoldering isconfirmed.
Since lead-free solder includes a greater quantity of tin, the iron tip may c
orrode easily. Turn ON/OFF the soldering iron power frequently.
Ifdifferent-kindsolder remains on the soldering iron tip, it is melted together with lead-free solder. To avoid this, cleanthe soldering iron
tip after completion ofsolderingwork.
If the soldering ir
on tip isdiscolored black duringsolderingwork, clean andfile the tip withsteel wool orafinefiler.
Example:
5mm
Lead-Free
Solder composition
code (Refer to the
table atthe right.)
<Solder composition code of lead-free solder>
Solder composition
Sn-Ag-Cu
Sn-Ag-Bi
Sn-Ag-Bi-Cu
Sn-Zn-Bi
Sn-In-Ag-Bi
Sn-Cu-Ni
Sn-Ag-Sb
Bi-Sn-Ag-P
Bi-Sn-Ag
a
b
z
i
n
s
p
Solder composition code
a
LEAD-FREE SOLDER
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