Trouble Shooting - Bernina ACTIVA 135 S User Manual

62 Faults

Trouble shooting

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. 57
•
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
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.
•
030529.52.04_0303_a135 a145_EN
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 56 and 57 for
•
information about needles
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.