Service manual
PC
1600
2. Remove the eleven screws (see figure) and remove
the
key
PWB
(with the
FPC
PWB)
from the top cabinet.
• .
.....
. ...
iU==j
------
--
-
r=~~-I
Fig. 8-4
NOTE: Do
not
drop the rubber connector
and
rubber
spring sheet
that
are used
to
hold the soft key.
If
the
electrically conductive part
of
the
rubber
connector were
to
be contaminated,
it
could
be
a cause
of
a failure after the assembly
of
the
unit
.
3.
Generally. the FPC
PWB
sh
ould not
be
used again once
removed from
the
key PW8 because
the
soldered
pattern
might separate from
the
board.
Since
the
key
?WB
is
bonded
to
the
FPC
PWB
, to
remo
ve,
hold
the
shadowed portion
at
(AI with a double
tack
tape
and warm
the
area
wi
th a hair dryer; then
separate this portion from
the
solder using a soldering
pencil,
I1Q100llQQITmJlUI/lJlJlJUIJlIUl/ODJOOanuvvOtn17tl1llJ
o 0
o 0
lA'
Fig.
8·6
-
16
-
NOTE : This job
is
required for
the
reuse
of
the
key
PWB
.
4.
Ho
w
to
solder
the
FPC
PWB
with
the
key
PWB
(1) Apply a thin layer
of
solder over
the
soldered portion
of
the
FPC
PWB.
(2)
Cut
away 1.5
to
2.0 m
illi
meters of
the
tip
of
the
FPC
PWB
usi
ng
a knife
or
scissors, in order
to
check
whether
the
sol
der
melted
at
the
exposed portiOrt ®
of
the
key
PWB
will function when heating
at
(
4)
.
(3)
Remove
the
backing paper
of
the
double tack tape
bonded
on
the
back
of
the
FPC and temporarily fit the
FPC
PWB
to the key
PWB
.
(4) U
si
ng
a solderi
ng
pencil heated
to
260
° ± 5°C and a
pair
of
tweezers, hold
the
FPC with
the
tweezen
because
the
FPC may separate when heated from
above.
After
removi
ng
the
pencil, hold
the
FPC with
the
tweezen
for five seconds more.
1.
5-2
.
0mm
1
.5-
2.0
mm
F=
FPC
unh
Key
PWB
®
" -
FPC
unit
Fig,
8·6
.,'
........
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................................................
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~