Bernina 800DL Manual - Page 15

How to avoid breaKdowns 1. Generally, most breakdowns are caus- c) needle hole in throat plate is damag- c) tension of driving belt is either too ed by incorrect handling of the machine. ed by the needle and needs repolishing tight or too loose (call authorized BerIf breakdowns do occur then examine (call authorized Bernina dealer to change nina dealer); whether: needle plate). d) use of low quality oil can block the a) the needle is inserted properly (the movement. The machine must be dis- flat side of the needle must be at the back); b) the correct needle is being used (see 4. Faulty stitches. Can have ing causes: the follow- mantled and cleaned. Call Bernina dealer; e) machine has been standing in a cold needle and thread table); a) wrong needle. Use system 705 B only; room. c) the machine is cleaned properly. Lift b) needle is crooked or not inserted free arm cover plate and remove sewing correctly (push needle right up in the When you bring your machine to an ex- lint; needle bar!); pert, please take along accessories and d) the hook race is clean and oiled; c) low quality needle, roughly polished. foot starter. e) there are pieces of thread caught between the thread tension discs under the bobbin case spring; or 5. Needle breaks. Can have the follow- f) hand wheel is secured properly. ing causes: a) needle clamp screw is not sufficient- ly tightened; 2. If the upper thread breaks. Can have b) the material was withdrawn towards the following causes: the operator and needle bent (material a) top thread is too tight; should always be withdrawn to the rear); b) use of inferior needles (buy them pre- c) when sewing over thick part material ferably from a Bernina dealer); was pushed whilst the needle was still c) needle inserted wrongly. Flat side in, therefore it bent, touched the throat must be at the back; plate and broke; d) the needle is blunt or crooked; e) poor quality or knotted thread. d) when cheap cotton, irregularly twisted or even containing knots is used. Thread has dried out due to long storage; f) the needle plate hole is pitted by 6. Seam irregularities. A bad uneven needle and needs repolishing (bring seam results: the free arm cover plate or needle plate a) if thread remnants are between the to authorized Bernina dealer); thread tension discs; Important note (safety regulations) g) hook point is damaged (call authoriz- b) is thread remnants are under the ed Bernina dealer). bobbin case tension spring. Please observe the sewing position while sewing. The moving needle is a source of danger (danger of injury to fingers). 3. If bottom thread breaks. Can have 7. Machine runs slowly the following causes: a) Motor does not function properly a) the bottom thread tension is too tight; (call authorized Bernina dealer); b) bobbin is crushed and jammed in the b) foot starter does not function proper- bobbin case; ly (call authorized Bernina dealer); The sewing machine should be disconnected from the power supply by pulling out the plug from the socket when changing the needle, presser foot, bobbin or needle plate, when stopping work without supervision and during servicing (cleaning). 15