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I
!X.
CHECKING
THE NEEDLE
POSITION DETECTING CIRCUIT
1.
Check
the
needle
position detecting
circuit.
*The
pattern
card
is
not
used
for
this
checking.
Set
the
pattern variation switch N0.6 (NEGATIVE)
to
the
upper position
and
the pattern
selector
switch
to
the middle (A+B) position.
Program
the
information
according
to
the
item
llX.6.
There
is
no
need
to
program
if
the
programming
finished
at
the
checking
of the
item
llX.
Push
the
CF key.
Align the
needles
from
yellow 60th
to
green
60th in
position
B
and
push back
the other
needles
to
position
A.
Place
the
K carriage
outside
of
the
turn
mark
"l c
and
set
the
change
knob
to
position
"KC(ll)".
After
moving
the K
carriage
to
the other
side
of
the
machine,
the
needles
between
the
yellow
30th
and
green
30th
are
selected
to
position
B
and
the other
needles are selected
to
position
D.
Place
the
K
carriage
outside
of
the other
side
turn
mark
and
turn
off
the
power
switch
and
turn
it
on
again.
Move
the
K
carriage
to
the other
side
of
the
machine,
all
the
needles
should
be
selected
as
same
as
before.
Check
the
L carriage
in the
same
manner
as
the K
carriage.
Note:
Align all the
needles
in position
B
before
operating
the
L
carriage.
The yellow 60th
and
the
green
60th
needles
will
not
be
selected
to
position
D
with
the
end
needle
selector mechanism.
2. All
the
needles are
left in position
B.
The pattern variation switch No.6
(NEGATIVE)
does
not
work
correctly.
Replace
the pattern
case
whole
unit
or the main
P.C.B. assembly
with
a
new
one.
3.
There
are
many
needles
selected
to
position
D.
lf
this
incorrect
needle
selection
appears
when
moving
the
K
carriage
from
right
to
left,
the adjustment
of
the
level
for
the
right
position
sensor
is
wrong.
lf
it
appears
when moving
the
K
carriage
from left
to
right, the
adjustment
of
the
level
for
the
left
position
sensor
is
wrong.
lf
the position
of
the
needle selection
slides
to
the
left or
right.
4-1. The
right and
left
position
sensor are
not
mounted correctly.
4-2.
Poor
adjustment
of
the
level
for
the right
and
left
position
sensors.
4-3.
There are
some defects
on the rotary
encoder
and/or
encoder
board
assembly.
Adjusting the
right
position
sensor.
5-1.
Bring back
all the
needles
to
position
A
and keep
the
sensor
magnet
of
the
L
carriage away
from
the
right
position
sensor.
5-2.
Remove
the
needle
selector
panel assembly,
turn
on the
power switch
and
check
the
voltage
of
the
check
pin
(CH301)
on
the
encoder board
with
the
tester
by setting
it
to
the DCV.3
range.
Connect
the
black
terminal
of
the
tester
to
the
metal part
of
the
machine
body
and
the
red
terminal
to
the
check
pin
(CH301). (Fig.
38).
The indicator
of
the
tester shows 1.6V
-
2.0V.
4.
5.
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a
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ffi
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eI
ffi
ffi
tl
4at
,fl
4at
At
a
8i
ffi
a
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qi
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Ai
(i-l
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Fig.38
-21
-
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