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T
he P
W
B
’
s of this model employs lead-free solder
. T
he
“L
F
”
marks indicated on the P
W
B
’
s and the Service
M
anual mean
“L
ead-Free
”
solder
.
LEAD-FREE SOLDER
T
he alphabet follo
w
ing the
L
F mark sho
w
s the kind of lead-free solder
.
(1) NOTE FOR THE USE OF LEAD-FREE SOLDER THREAD
W
hen repairing a lead-free solder P
W
B
,
use lead-free solder thread
.
N
ever use conventional lead solder thread
, w
hich may cause a breakdo
w
n or an accident
.
Since the melting-point of lead-free solder thread is about
4
0
°
C higher than that of conventional lead solder thread
,
the use of the
exclusive-use soldering iron is recommended
.
(2) NOTE FOR SOLDERING WORK
Since the melting-point of lead-free solder is about
22
0
°
C
, w
hich is about
4
0
°
C higher than that of conventional lead solder
,
and its soldering
capacity is inferior to conventional one
,
it is apt to keep the soldering iron in contact
w
ith the P
W
B for longer time
. T
his may cause land
separation or may exceed the heat-resistive temperature of components
. U
se enough care to separate the soldering iron from the P
W
B
w
hen
completion of soldering is confirmed
.
Since lead-free solder includes a greater
q
uantity of tin
,
the iron tip may corrode easily
. T
urn
ON/O
FF the soldering iron po
w
er fre
q
uently
.
If different-kind solder remains on the soldering iron tip
,
it is melted together
w
ith lead-free solder
. T
o avoid this
,
clean the soldering iron
tip after completion of soldering
w
ork
.
If the soldering iron tip is discolored black during soldering
w
ork
,
clean and file the tip
w
ith steel
w
ool or a fine filer
.
Example:
5mm
L
ead-Free
Solder composition
code (
R
efer to the
table at the right
.
)
<Solder composition code of lead-free solder>
Solder composition
Sn-Ag-Cu
Sn-Ag-Bi
Sn-Ag-Bi-Cu
Sn-
Z
n-Bi
Sn-In-Ag-Bi
Sn-Cu-
N
i
Sn-Ag-Sb
Bi-Sn-Ag-P
Bi-Sn-Ag
a
b
z
i
n
s
p
Solder composition code
a
