Attachment
96
7.5 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.
Uneven stitch formation
Incorrect bobbin case is used.
> Use the supplied bobbin case marked with the triangle.
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.
Uneven 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.
Summary of Contents for 500 E
Page 1: ...BERNINA 500...
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