Re: when i sew the bobbinbinds up underneath plate and...
What are you doing when this happens, embroidery or sewing? Also are you creating a nest, or does the bobbin not move freely?
Check to see that the bobbin is not over wound. The thread should not touch the sides of the bobbin case. This can happen if the bobbin adjustment, the white dial adjacent to the bobbin winder, has been turned and the bobbin winder kicks off too late.
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try changing the needle--normally flat side goes to the back of the machine also make the needle & thread will work for the fabric being sewed make sure the bobbin is turned the right way & inserted correctly in the bobbin case make sure that the thread has not come off the thread take up lever clean under the needle plate & in the bobbin area for loose thread & lint
If the plate is moving up and down eithetr the teth are set far too high pushing the plate up or the teeth are set too far forward, I would go for the first, if the teeth are coming up well above the slot they are too high, they should be set so that when you look alongside the plate you can just see the top of the teeth, you can adjust the teeth by adjusting the screws underneath the machine where the teeth are.
Have you turned it back on once the machine has cooled down? If you have, and it still makes noise and won't stitch then I think the motor is damaged and you need to take it for repair. Does it do ordinary sewing or is the motor completely uncooperative? Meantime, take the bobbin assembly apart and clean it out - ask for more instructions if you don't know how to do this. Be sure both the top thread and bobbin threads are threaded correctly and clicked into their respective tensions. Did you "park" the embroidery unit before turning the machine off? You need to do this, if the machine will do it that is. You will need to take the machine in to be checked even if you do get it working. Any major problem with nesting - did you break needles too? - almost certainly will have put your needle assembly out - it will need re-centering.
I had the same problem and I tried everything including removing the bobin case, cleaning out lint, changing the needle, adjusting the tension but it did not work. Then I finally tried reloading the bobin thread, making sure to load the bobin according the manual directions....and the problem was solved...no more tangles... just a nice even stitch...yeah!
I have a Janome 9000, was sewing and broke needle, replaced and broke another. I didn't have machine threaded, took out bobbin and would sew a little and stop saying thread broke. I took off top plate and started machine again, sew a little and stop saying thread broke. So I took out bobbin case and sewed again and stopped repeating the message. Everything looks OK, bobbin case and top plate. I guess I want to know if the timing could be off or do you think it is the computer part of the machine...Should I take it to the Sewing Machine Shop??
Can you remove the bobbin? Sometimes when thread gets bunched up under the lower plate it will force the bobbin out of position. Try taking it out and cleaning any loose thread and lint from the area. Put a couple of drops of oil on the outside of the bobbin case and re-insert it. Make sure you lower the needle and pull the bobbin thread through to the top and back behind the needle before beginning to sew again.
Hope this works!