Bernina 717 Manual - Page 49
avoid, breakdowns
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How to avoid breakdowns 1. Generally, most breakdowns are caus- (call authorized Bernina dealer to change When you bring your machine lo an ex- ed by incorrect handling of the machine. needle plate). pert, please take along accessories and If breakdowns do occur then examine foot starter. whether: 4. Faulty stitches. Can have the follow- a) the needle is inserted properly (the ing causes: flat side of the needle must be at the a) wrong needle. Use system 705B only; back); b) needle is crooked or not inserted b) the correct needle is being used (see correctly (push needle right up in the needle and thread table); needle bar !) ; c) the machine is cleaned properly. Lift c) low quality needle, roughly polished. free arm cover plate and remove sewing lint; 5. Needle breaks. Can have the follow- d) the hook race is clean and oiled; ing causes : e) there are pieces of thread caught a) needle clamp screw is not sufficient- between the thread tension discs or ly tightened; under the bobbin case spring; b) the material was withdrawn towards f) hand wheel is secured properly. the operator and needle bent (material should always be withdrawn to the rear); 2. If the upper thread breaks. Can have c) when sewing over thick part material the following causes: was pushed whilst the needle was still a) top thread is too tight; in, therefore it bent, touched the throat b) use of inferior needles (buy them pre- plate and broke. ferably from a Bernina dealer); d) when cheap cotton, irregularly twist- c) needle inserted wrongly. Flat side ed or even containing knots is used. must be at the back; d) the needle is blunt or crooked; e) Poor quality or knotted thread. 6. Seam irregularities. A bad uneven seam results: Thread has dried out due to long a) if thread remnants are between the storage; thread tension discs; f) the needle plate hole is pitted by b) if thread remnants are under the needle and needs repolishing. (Bring bobbin case tension spring. free arm cover plate, resp. needle plate to authorized Bernina dealer.) 7. Machine runs slowly g) hook point is damaged (call authoriz- a) Motor does not function properly ed Bernina dealer). (call authorized Bernina dealer); b) foot starter does not function proper- 3. If bottom thread breaks. Can have ly (call authorized Bernina dealer); the following causes: c) use of low quality oil can block the a) the bottom thread tension is too tight; movement. The machine must be dis- b) bobbin is crushed and jammed in the mantled and cleaned. Call Bernina bobbin case; dealer; c) Needle hole in throat plate is damag- d) machine has been standing in a cold ed by the needle and needs repolishing room.