Pfaff 339 Owner's Manual - Page 67

thread, breaks

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- The upper thread breaks: 1. The needle is bent or inaccurately in serted-replace the needle (see page 6. The upper tension is too strong - loo sen it (see page 25). 7. The eye of the needle has a cutting edge - replace the needle. 2. Knotty, inferior quality thread is being used - use a better quality. 3. The upper thread is incorrectly thread ed - thread the machine correctly (see page 17). 4. The needle is too fine for the thread or fabric - use a thicker needle (see pages 10, 11 and 12). 5. The tension regulator spring 735090 is broken - get a new one to replace it. 8. The bobbin case has a rough spot cutting the thread - take out the bobbin case and consult your dealer. 9. The needle plate hole has a cutting edge - smoothen it with emerycloth. 10. The feed does not transport the work properly owing to an accumulation of lint and thread ends - unscrew the needle plate and clean the feed as sembly thoroughly. 69 H

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-
H
The
upper
thread
breaks:
6.
The
upper
tension
is
too
strong
—
loo
sen
it
(see
page
25).
1.
The
needle
is
bent
or
inaccurately
in
serted—replace
the
needle
(see
page
7.
The
eye
of
the
needle
has
a
cutting
edge
—
replace
the
needle.
2.
Knotty,
inferior
quality
thread
is
being
8.
The
bobbin
case
has
a
rough
spot
cut-
used
—
use
a
better
quality.
ting
the
thread
—
take
out
the
bobbin
case
and
consult
your
dealer.
3.
The
upper
thread
is
incorrectly
thread
ed
—
thread
the
machine
correctly
9.
The
needle
plate
hole
has
a
cutting
(see
page
17).
edge
—
smoothen
it
with
emery-
cloth.
4.
The
needle
is
too
fine
for
the
thread
or
fabric
—
use
a
thicker
needle
(see
10.
The
feed
does
not
transport
the
work
pages
10,
11
and
12).
properly
owing
to
an
accumulation
of
lint
and
thread
ends
—
unscrew
the
5.
The
tension
regulator
spring
735090
is
needle
plate
and
clean
the
feed
as
broken
—
get
a
new
one
to
replace
it.
sembly
thoroughly.
69