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12.2 Troubleshooting
Malfunction Cause Repair
Uneven stitch formation Upper thread too tight or too
loose.
> Adjust the upper thread tension.
Needle blunt or bent.
> Change the needle and make sure the a new BERNINA
quality needle is used.
Poor quality needle.
> Use a new BERNINA quality needle.
Poor quality thread.
> Use quality thread.
Incorrect needle/thread
combination.
> Match the needle with the thread size.
Incorrectly threaded.
> Rethread.
The fabric has been pulled.
> Feed the fabric evenly.
Uneven stitch formation
The incorrect bobbin cased is
used.
> Use the supplied bobbin case with triangles.
Skipped stitches Incorrect needle.
> Use needles of the needle system 130/705H.
Needle blunt or bent.
> Change the needle.
Poor quality needle.
> Use a new BERNINA quality needle.
The needle is incorrectly inserted.
> Insert the needle into the needle holder with the flat
side to the back as far it will go and tighten the screw.
Incorrect needle point.
> Match the needle point with the textile structure of the
sewing project.
Faulty stitching Thread remnants between the
thread tension discs.
> Pull thin folded fabric (don't use fabric edges) through
the thread discs several times.
Incorrectly threaded.
> Rethread.
Thread remnants below the
bobbin case spring.
> Remove the thread remnants below the spring.
036044.50.04_2014-09_Manual_740_EN
118


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