Lower Thread Breaks - Bernina Record 930 Service Manual

LOWER THREAD BREAKS

1. Make sure the bobbin is inserted correctly and the right bobbin for
your machine is being used. Generic bobbins should not be used
in your machine.
2. Check that the thread is in the bobbin tension and the tension is
not too tight. Also check for thread or lint caught in the tension
spring.
3. Make sure the bobbin is evenly wound.
4. Check the needle plate for damage.
BOBBIN THREAD NOT BEING BROUGHT UP
1. Check that the needle is inserted correctly.
2. Check threading of the machine. If the take-up lever is not
threaded properly the thread will not come up.
3. Hook timing may be out. The hook must pick up the thread from
the scarf of the needle.
STITCH LENGTH VARIES OR WILL NOT FEED
1. Check that your feed dogs are coming up above the needle plate.
2. Check the pressure foot pressure. There must be some pressure
on the foot to feed the fabric. Your machine has an automatic
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