(
Troubleshooting guide
)
If
t
he performance
of
the
mach
ine
becomes unsati
sfacto ry,
fi
rst
check t
o
confirm that
the needle
has been
correctly installed an
d
that
thread
ing
has
been
done correctly
.
Trouble
Cause
Remedy
Page
I
r-
Excessive
tension
disc pressure.
1-----
Adjust
to proper
pressu
re.
15
1-
Poor-q
uality
th
read.
1-----
Replace w
ith
good
quality
thread.
/
1-
Th read is too thick
for
needle
eyelet.
I - -
Replace needle with
one of
proper
size.
13
Thread
break
1-
1-
Needle
finished.
groove,
eyelet
improperly
I - -
Replace
w
ith
good needle.
13
Needle,
looper or needle thread
take-up
Refer to needle bar height, right looper
21
~
I - -
22
incorrectly p
ositi
oned.
position
an
d thread tension.
15
-
Flaw in needle,
looper,
needle
plate,
1----
Replace,
or
use
an oil stone or
buffer
to
/
presser
foot
tongue, thread passage,
etc.
correct.
r -
Excessive
pressure.
or
insuffient
tensio n-d isc
r - -
Adj ust
to proper
pressure.
15
1-
Blunt or
be nt needle point.
-
Replace
with
new
needle.
13
Stitches skip
Needle,
loopers,
and thread
take-ups in-
Refer
to needle bar
height,
right looper
21
-
1-
correctly
positioned,
or clearance is
incor-
-
22
rect.
position
and thread tension.
15
1-
Need
le
and
need
le
guard
B incorrectly
-
Refer to right
looper
position and needle
22
positi oned.
guard B
stroke
adjustme nt.
24
' -
Looper
tip
is
dull.
1-----
Use
an
oil stone or buffer
to
correct.
/
r-
Needle bent.
-1
Replace with new
needle.
I
13
I
Needle
break
1-1-
Needle
tioned
.
and
loopers
incorrectly posi
-
1-----
Refer
to needle
bar
height,
right looper
21
pOSit
iOn.
22
' - -
Needle
and
needl
e
guard B
incorrectly
I - -
Refer
to right looper position and
needle
22
positioned.
guard
B
stroke adjustment.
24
- 57
-
