White 8000 - Page 48

Trouble
Probable
Cause
Correct
Operation
Stitches
Upper thread
tension too loose.
18
not
locked
Improper tension of the
lower thread.
8,19
Improper
needle for the
thread.
9
Upper
or lower
thread tension
too tight.
18,19
Improper threading
of
upper
or lower
thread.
8,11
Wrinkled
Needle
too
thick
for the
fabric.
9
fabrics
Stitch
length
too long for
the fabric.
13
When sewing
very
fine fabric, place thin paper
underneath
the fabric
for better results.
Fabric
not
Dust of thread jamming
on
the
feed dog.
42
moving
Feed
dog
is
lowered.
14
Improper needle
setting,
9
Needle bent.
Needle clamp screw too
loose.
9
Breaking
Upper thread
tension too
tight.
18
needle
Needle
too
thin for the fabric.
9
Changing
pattern or
width
of the
stitch
with
the needle down
in
the fabric.
13
Setting
stitch width more than
3.5
when sewing
with twin needle.
20
Not
plugged
in
properly.
4
Light going
Power supply
switch is not
on.
4
Ughtbulbrntou
NB.
If trouble is still apparent
in
the machine, please
consult
your nearest dealer.
Do
not
try to correct
the fault
by
yourself.
45