Bernina 790 - Troubleshooting

Attachment
176
12.2 Troubleshooting
Fault Cause Repair
Uneven stitch formation Upper thread too tight or too
loose.
> Adjust upper thread tension.
Needle blunt or bent.
> Replace the needle, make sure that 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 the needle system 130/705H.
Needle blunt or bent.
> Replace the needle.
Poor quality needle.
> Use a new BERNINA quality needle.
The needle is incorrectly inserted.
> Insert the needle with the flat side to the back as far up
as it will go and tighten the screw.
Incorrect needle point.
> Match the needle point to the texture of the material.
Faulty stitching Thread remnants between the
thread tension discs.
> Fold a piece of thin material and slide the folded edge
(not the raw edges) between the thread tension discs.
Incorrectly threaded.
> Rethread.
Thread remnants below the
bobbin case spring.
> Remove the thread remnants under the spring.
035964.50.04_2014-08_Manual_B790_EN