Pfaff SZA-645F - Troubleshooting

PROBLEMS
—
and
PROBABLE
CAUSES
ed
once
tly
and
ntinual
In
most
cases,
poor
sewing
results
are
due
to
a
damaged
needle.
Always
en
used
examine
needle
first
before
checking
other
items.
ore
you
1.
SKIPPING
STITCHES
sewing
•
bent
or
blunt
needle
points
•
wrong
size
needle
•
needle
inserted
incorrectly
•
upper
thread
tension
too
tight
•
pressure
on
presser
foot
too
light
•
2.
UNEVEN
STITCHES
iot
give
ich
will
•
bent
or
blunt
needle
•
wrong
size
needle
fabric.
•
incorrect
threading
w
rows
•
pulling
fabric
while
sewing
alto
be
•
upper
thread
tension
too
loose
•
Also
•
pressure
on
presser
foot too
light
top
of
•
loose
presser
foot
•
bobbin
wound
unevenly
•
bobbin
inserted
incorrectly
in
case
rication
*
s
been
3.
NEEDLE
BREAKS
•
bent
needle touches
needle
plate
or
presser
foot
•
needle
inserted
incorrectly
• pulling
fabric
while sewing
•
loose
presser
foot
touches
needle
•
needle
too
fine
for
fabric
turning
stitch
pattern
dial
or
needle
position
dial
with
needle in
fabric
4.
UPPER
THREAD BREAKS
• bent
or
blunt
needle
•
incorrect
threading
•
upper
tension
too
tight
•
needle
inserted
incorrectly
•
needle
touches
presser
foot
•
needle
eye
has
sharp
edges
•
poor
quality
thread
• knots
in
thread
•
starting
to
stitch
too fast
— 42
—