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L
C.
Lower this
side
of
the
pattern
case
and
insert
the left
position
sensor
board
assembly
between
the
main
P.C.B.
and
the
operation
P.C.B.
and
put
it
on
the
machine
body.
lnsert
the left
side
of
the
pattern
case
whole
unit into the
lower
side
plate
(L)
by sliding
it
to
the left.
Make sure
that the
lead
wire
of
the
connectors
do
not
lay
on the
huzzer.
lf
the
lead
wire of the
connectors are
laid on the
buzzer,
it
can
not
make
the proper
sound.
2).
Assemblying
the row counter
panel.
Set
the
hole
of
the row counter
panel
to
the yarn
tention
stand rod.
Fasten
the
two
screws.
(Use
the
long
screw
for
the
left
side)
3).
Assembling
the
needle
selector panel
assembly.
lnsert
the
needle
selector
panel assembly
into
the
lower
side
plate
(R)
and fasten
the right
screw
first,
and
then
fasten
the
left
screw.
2.
Replacing
the main
P.C.B.
assembly.
The main
P.C.B.
assembly
contains
the
main
P.C.B. and
the
operation
P.C.B.
which
are
connected
by the
flexible
printed
cable
(F.
P.
cable).
(Fig. 66)
Fig.66
The operation
P.C.B.
is mounted
to
the
pattern
case
by twelve
screw and
the
main
P.C.B.
is
mounted
to
the
spacers
of the operation
P.C.B.
by five
screws.
There
two
printed
circuit
boards consist
of the LSl,
lC,
etc.
which
can
be damage
by static
electricity.
When
handling
the printed
circuit
boards,
hold the
edge
of
the
board
and wear
an
earth
wire
fot
the prevention
of
static
electricity.
There
two
printed
boards
must be
kept in the
parallel
condition
to
protect
the
F.P.cable
from
damage.
2-1.
Disassembling
the main
P.C.B. assembly.
1).
Removing
the
batteries.
Remove
the
batteries
from the battery
box
by
referring
to
the instruction
manual
page
89.
21.
Removing
the main
P.C.B.
A.
Hold the
pattern
case
whole
unit with
the
rear side
facing
you
and
put
the battery
side
of it
on
the left.
B.
Take
out the battery
cord.
Take care
when
handling
it to
protect the battery cord
from
damage,
especially,
the
parts
which
are
soldered
to
main
P.C.B.
C.
Remove
the five
screws.
Take care
not
to
damage
the
printed circuit board when
using
the
screw
driver.
(Fig. 67)
Fis.67
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Battery
cord
-37
-
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