Pfaff 90 User Manual

3.
Needle
Breaks
Cause:
Bent
needle
strikes
point of
sewing
hook.
Needle
too
thin
or
thread
too heavy.
Fabric pulls
needle so
it
bends
and
strikes needle
plate.
Bobbin case
inserted
incorrectly.
4.
Faulty
Stitch
Formalion
Cause:
Improper
tension.
Thread
too
heavy,
knotty
or
hard.
Bobbin
unevenly
wound.
Pieces
of
thread
between
tension
discs.
5.
Machine
Feeds
lmpropery
Cause:
Machine
does
nat
feed
because
stitch
length
control
set
on
“0”.
Accumulations
of
lint
pocked
between
feed
teeth.
Remedy:
Replace
needle
at
once
to
prevent
further
damage.
Use
correct
needle
and
thread
sizes.
Don’t
force
the
feeding
motion.
Guide
the
material
lightly.
Push bobbin
case
until
you
hear it
snap
into
place.
Remedy:
Adjust
tensions
as
instructed.
Use
only first-rate
thread —
the
correct
size
for the
needle
and
fabric.
Dont run
thread over
finger when
winding
the
bobbin,
but
lead
it
around
needle
thread
tension.
Raise presser
bar
lifter
and
remove
thread.
Remedy:
Regulate
stitch
length,
as
desired.
Take
off
needle
plate
and
remove
lint with
a
stiff
brush.
26

Pfaff 90 Specifications

General

Brand	Pfaff
Model	90
Category	Sewing Machine
Language	English