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TROUBLE
SHOOTING
Problem
Probable cause
Correction
Breaking
upper
thread
Incorrect threading
P.21-22
Thread jams inside the shuttle
Remove
thread
Incorrect needle
inserting
P.27-28
Upper tension too
tight
P.29-30
For the
tabric
used,
the
thread
is too
thin
P. 82
Breakmg
lower
thread
Thread not
wound
evenly, on the bobbin or
not drawn
P.17-18, P. 25-26
Remove lint
al
up
correctly
Lint
stuck
in the bobbin
Clean with
brush,
the tension
spring
(79-80)
Skipping
stitches
Needle not fully inserted
P.27-28
Needle bent
P.27-28
Size or
type
of
needle and
thread
not suitable
for the
material
P.82
Incorrect upper threading
P.21-22
Too
much
oil on
the
shuttle
P.
82
and remove
excess
oil
The material
puckers
Upper
or
lower thread tension too tight
P.29-30
Stitch
too
long for material
Follow recommended
length
Thread too thick
P.82
Incorrect threading
of
upper
or
lower thread
P. 21-22, P.
19-20
The
thread makes
loops
Incorrect
setting of
bobbin case
P.
19-20
Incorrect
threading
P.2
1-22
Unbalance
tension of
upper
and
lower thread
P.29-30
The material
not fed
Incorrecting
setting
of stitch
length
Follow recommended
length
correctly
Lint
on
the feed dog
P.79-80
Breaking
needle
Needle
not
correctly
inserted
P.
27-28
Needle
bent
P.
27-28
Needle
clamp
screw
too
loose
Tighten
needle clean
Upper
thread tension
too tight
P. 82
Needle too
fine for the
material
P. 82
Dials have been
change
while
needle
was
down
on
the material
Exchange
needle
Heavy
torque or
noise
Lint inside the
shuttle
race
P.79-80
Lint
on
the
feed
dog
P.79-80
Machine
doesn't run
Power plug is not plugged
correctly
P.13-14
Bobbin winder
spindle
is on right position. (under
bobbin
winding
P.17-18
position)
Thread
jams
inside the shuttle race
P.79-80
For any
other
problems
occurred, or exchange
of the
parts,
please consult with
your
dealers, or qualified
technicians purchased.
85
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