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Errors and Faults
77
2022-08 EN 5020070.40A.04
9
Errors and Faults
9.1 Troubleshooting
Fault
Cause
Repair
Uneven Stitch Formation
Upper thread too tight or too
loose.
> Adjust the 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.
Dust or thread remnants under
the tension spring of the bobbin
case.
> Remove any dust or thread remnants from under the
tension spring of the bobbin case.
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 into the needle holder and tighten the
screw.
Incorrect needle point.
> Match the needle point to the texture of the material.
Upper Thread Breaks
Incorrect needle/thread
combination.
> Match the needle with the thread size.
Upper thread is too tight.
> Reduce the upper thread tension.
Incorrectly threaded.
> Rethread.
Poor quality thread.
> Use quality thread.
The stitch plate or the hook tip is
damaged.
> Contact a specialized bernette dealer to have the
damages repaired.
> Replace the stitch plate.
Содержание b70 DECO
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