Bernina 820, Руководство пользователя

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troubleshooting
avoiding and Solving problems
fault
cause
repair
Some failures may be remedied by switching the sewing computer off, then on again after 10 seconds.
uneven stitch formation
Lower thread incorrectly threaded Upper thread incorrectly threaded Poor quality needle or bent Upper thread too tight/too slack Poor quality thread Lower thread too tight/too slack
Check lower threading path Check upper threading path Use a new, good quality needle (BERNINA) Reduce/increase upper thread tension Use quality threads (Isacord, Mettler, Gütermann) Reduce/increase lower thread tension
Skipped stitches
Incorrect needle system Needle bent or blunt Needle/thread combination is incorrect Needle inserted incorrectly Incorrect needle point Poor quality needle
Use needle system 130/705 H Use new, good quality needles (BERNINA) Match the needle to the thread size, see page
26
Insert needle as far up as it will go Match the needle type to the fabric Use good quality needles
upper thread Breaks
Upper thread tension too tight Incorrectly threaded Poor quality or old thread Stitch plate or hook tip damaged
Reduce upper thread tension Check upper thread threading path Use good quality thread Have the sewing computer checked by a dealer Remove any remaining threads in the pre-tension with tweezers and check the take up lever, see page
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Lower thread breaks
Lower thread tension too tight Stitch hole in the stitch plate has been damaged Needle blunt or bent
Reduce lower thread tension Have the sewing computer checked by a dealer Use a new needle
032298.53.04_1204_B820_EN