Bernina Sewing Machine manual Trouble shooting

Trouble shooting

In most cases you will be able to identify and remedy faults by checking the following.

Check whether:

•the upper and lower threads are threaded correctly

•the needle is inserted correctly

•the needle size is correct – check the needle/thread table p. 42

•the sewing computer is clean – brush out any thread fluff

•the hook race is clean

•any threads are trapped between the tension discs or under the bobbin case spring

•the bobbin runs smoothly in the case or if remnants or lint need removing

Skipped stitches

Faulty stitching

Upper thread breaks

•The upper thread tension is too tight.

•The needles are of a poor quality. Ideally needles should be purchased from your BERNINA dealer.

•The needle is bent or blunt.

•Poor quality, knotted or dried out thread has been used.

•Use the correct spool disc.

•Stitch plate or hook tip damaged. Take your sewing computer to your BERNINA dealer.

Lower thread breaks

•The lower thread tension is too tight.

•The bobbin is jamming in the bobbin case. Remove and replace the bobbin.

•The hole in the stitch plate has been damaged by the needle. This must be repolished by an expert.

•The needle is blunt or bent.

Needle breaks

•Needle clamp screw loose.

•Fabric taken out in front instead of behind presser foot.

•When sewing over thick area, the fabric was pushed with the needle still in the fabric.

•Poor quality thread, unevenly wound or knotted.

•See pages 42–44 for infor- mation about needles

Sewing computer fails to run or runs slowly

•Plug not properly inserted.

•Power switch in off position.

•Sewing computer has been standing in a cold room.

•Bobbin winder still switched on.