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49Faults
Trouble shooting
Upper thread breaks
The upper thread tension is
too tight.
The needles are of a poor
quality. Ideally needles should
be purchased from your
BERNINA dealer.
The needle is bent or blunt.
Poor quality, knotted or dried
out thread has been used.
Use the correct spool disc.
Stitch plate or hook tip
damaged. Take your sewing
computer to your BERNINA
dealer.
Lower thread breaks
The lower thread tension is
too tight.
The bobbin is jamming in the
bobbin case. Remove and
replace the bobbin.
The hole in the stitch plate
has been damaged by the
needle. This must be
repolished by an expert.
The needle is blunt or bent.
Skipped stitches
Wrong needles used. Use only
130/705H system.
The needle is blunt, bent or
incorrectly inserted.
Push right to the top when
inserting.
Needle inserted all the way to
the top.
The needle point does not suit
the fabric being sewn. If
necessary use a ball point for
knitted fabrics and cutting
point for hard leather.
Needle breaks
Needle clamp screw loose.
Fabric taken out in front
instead of behind presser foot.
When sewing over thick area,
the fabric was pushed with
the needle still in the fabric.
Poor quality thread, unevenly
wound or knotted.
See pages 4244 for infor-
mation about needles
In most cases you will be able to identify and remedy faults by
checking the following.
Check whether:
the upper and lower threads are threaded correctly
the needle is inserted correctly
the needle size is correct – check the needle/thread table p. 42
the sewing computer is clean – brush out any thread fluff
the hook race is clean
any threads are trapped between the tension discs or under the
bobbin case spring
the bobbin runs smoothly in the case or if remnants or lint need
removing
Faulty stitching
Remnants of thread between
the tension discs.
Remnants of thread under the
bobbin case spring.
Lower thread still threaded in
the bobbin case finger.
Sewing computer threaded
with foot down.
Incorrect threading. Check
upper and lower threads.
Use the correct spool disc.
Sewing computer fails to run
or runs slowly
Plug not properly inserted.
Power switch in off position.
Sewing computer has been
standing in a cold room.
Bobbin winder still switched
on.
activa 125 (GB) 4.12.2002 14:16 Uhr Seite 49
030595.50.04_0201_a125_EN
49


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