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7.5 Troubleshooting
Following information can help to eliminate possible troubles of the machine on your own.
Check if:
The upper thread and the bobbin thread are threaded correctly.
The needle is inserted correctly.
The needle size is correct; refer to needle/thread chart (see page 31).
The point and the shaft of the needle are not damaged.
The machine is cleaned; thread remnants are removed.
The hook area is cleaned.
Thread remnants are stuck between the thread tension discs or under the bobbin case spring.
Failure Cause Troubleshooting
Uneven stitch formation Upper thread too tight or too
loose.
> Reduce or increase the upper thread tension.
> Check the lower thread tension using the adjustment
tool (optional accessory).
Needle blunt or bent.
> Use a new BERNINA quality needle.
Poor needle.
> Use a new BERNINA quality needle.
Poor thread.
> Use quality thread.
Incorrect needle/thread
combination.
> Match the needle with the thread size.
Incorrectly threaded.
> Check upper and lower thread.
Skipped stitches Incorrect needle system.
> Use the needle system 130/705H.
The needle is bent or blunt.
> Use a new BERNINA quality needle.
Poor needle.
> Use a new BERNINA quality needle.
The needle is incorrectly inserted.
> Push the needle right to the top.
Incorrect needle point.
> Match the needle point with the textile structure of the
sewing good.
Quilt sandwich stretched too
much.
> Don't stretch the quilt sandwich too much.
Glued quilt sandwich.
> Use the lubricating unit with silicon.
036 0625.2.04_2015-06_Manual_Q20-Q24_EN_GZD
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