Bernina Artista 730E User Guide - Page 188

Prevention and Remedy of Failures 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 as far up as possible with the flat side of the shank to the back • the needle size is correct - check the needle/ thread chart on page 18 • the sewing computer is clean - brush out any thread lint • the hook race is clean • any threads are trapped between the tension discs or under the bobbin case spring Skipped Stitches • wrong needles used: • use only 130/705H system • Needle is blunt, bent or incorrectly inserted: • Push right to the top when inserting • needle is of inferior quality or badly polished • the needle point does not suit the fabric being sewn; if necessary, use a ball point for knitted fabrics and a cutting point for hard leather • for narrower stitches use a stitch plate with smaller stitch plate hole (5.5mm, optional accessory) Trouble Shooting Upper Thread Breaks Possible Faults: • upper thread tension is too tight • needle is of inferior quality; purchase needles at your authorized BERNINA dealer • needle has been inserted incorrectly - the flat side of the shank must be to the back • needle is bent or blunt • poor quality, knotted, old or dried out thread has been used Possible Solutions: • use the correct spool disc • stitch plate hole 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 jammed in the bobbin case: • Remove and replace the bobbin • the hole in the stitch plate has been damaged by the needle: • this must be polished by an authorized BERNINA service technician • the needle is blunt or bent Calibration of the Display To open the calibration screen directly, proceed as follows: • press both needle position buttons on the body simultaneously and keep them pressed • turn on the sewing and embroidery computer • as soon as the calibration screen is opened, release the two buttons • Calibration of the Display see page 169 Needle Breaks • needle clamp screw loose • fabric pulled to the front instead of behind the presser foot • when sewing over thick area, the fabric was pushed with the needle still in the fabric; use Jeans foot No. 18 • for more information regarding Needle see page 19 Faulty Stitching • remnants of thread between the tension discs: • pull folded, thin fabric (do not use fabric edge) between the tension discs and clean them by moving the fabric forwards and backwards on the left and right side of the thread tension • remove remnants of thread under the bobbin case spring • incorrect threading. Check upper and lower threads • use the correct spool disc • clean and lubricate hook (use only original oiler; see Cleaning and Lubricating page 185) Cannot Sew Thick Fabric • needle/thread combination is not correct (the thread is too thick for the inserted needle) • use height compensating tool, when sewing over a thick seam Sewing Computer Fails to Run or Runs Slowly • plug not fully inserted • turn power switch off («0») • sewing computer has been standing in a cold room • restart sewing computer Sewing Computer Sews in Reverse • Continuous Reverse Sewing function is activated 186 Sewing and Sewing Computer Support - Trouble Shooting