I probably replaced the bobbin after filling it incorrectly. It jammed on the first stitch. I can not get anything to move with the hand wheel (haven't even tried the foot pedal, afraid to). I feel that it needs a professional to fix it, BUT, I am an American living in China and have no idea where to go for help and I really don't trust someone who has never seen a Bernina before. I have contacted the Bernina Co. and a dealer in Hong Kong (closest place to me, but still a trip to get there with the machine!) Do you have any suggestions on something I could do myself to fix it? I have carefully taken apart what I can, but I see nothing obvious wrong.
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You may need to increase the foot pressure to cope with the heavy denim material. Look carefully at the material as the machine tries to stitch ... if the foot is not keeping the material firmly on the stitch plate, it might be riding up on the needle (denim tends to be rather 'grippy') which will prevent the thread loop being formed correctly below the stitch-plate and therefore not getting picked-up by the CB hook. Changing to a bigger diameter needle might actually make the situation worse in this case ... go back to an 80 and try again.
The hook is in the bobbin area and is what takes the thread from the needle to make the stitch. A standard 15x1 needle or 705 needle is the correct needle for your machine. They are available at ant sewing center.
There is no way to change brushes on theses sealed motors and I highly doubt thats the issue. Most likely you didn't put the bobbinwinder back togeather correctly. The small spring type clip under it needs to be in the second notch of the teeth below the bobbinwinder to engage/disengage right. If you had the cover off its also possible you disconnected the wire to the circuitboard for the footcontrol, I beleive its black and red. Probably best for a tech to look at it.
If you've got bad luck like I do, you probably blew out the circuit board! It took my Bernina dealer 4 months to get another from Sweden; thank goodness they gave me a loaner.
Unfortunately, it happened again right after I picked it up from the dealer, and they have to find another circuit board for it! It's not a problem with my electrical wiring because the loaner ran just fine.
It's very, very frustrating because I'm a small business and need my machine running!