Hi Rick, I have a 153 that has been working perfectly but I put a filled bobbin on the thread spindle, to keep it out of the way, and while sewing away the end thread started wrapping around the turn wheel of the machine. All of a sudden I heard a bang, and stopped to look and found my bobbin all wound up around the spindly very tightly, and my motor wheel wouldn't move. I think the thread slipped into the small crack and jammed what little free space was there. I need to know how to actually get the cover off of the machine so I can look at the wheel hardware. I can't seem to figure out how to even get the cover off. I feel dumb but then read your earlier blog and I felt better after hearing it is hard to remove. Thank you in advance. Deborah
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Re: Problem with Bernina 153 motor
The problem with removing the covers is all the wire connections you have to unplug after taking the cover screws out and prying off the balance knob on the side. If you are not grounded you can send a static charge through the circiut boards thus eliminating them from functioning ever again. We wear a wrist strap with a grounding wire. Its possible you may have put the bobbin in the case wrong and it was turning the wrong way. The right way is clockwise. I really have to suggest it be looked at by a tech. Sorry.
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Hi, after your bobbin is wound insert it into the bobbincase. When you pull the thread the bobbin should turn clockwise. Then slip the thread through the notch and up under the spring. There is a small screw on this spring that adjusts the thread tension on the bobbincase in case you have to adjust it later.
Hope this helped.
Hi, if you look in the bobbincase you will see a round spring. Sometimes this gets moved and it blocks the hole the sensor reads through. Clean inside the bobbincase with a q-tip. Also clean the sensor lens on the door with a q-tip. Also try rewinding a bobbin but don't start with the thread through a hole in the bobbin.
Hope this helps.
Hi, possibly you have put the bobbin in upside down. Try flipping it over in the bobbincase and see what happens. It should turn clockwise when looking at the bobbin and pulling the thread.Check that your upper tension is not too loose. Check that it is threaded correctly.
Hope this helps.
Possibly its the check spring that takes up the slack in the thread as the needle pierces the fabric. slowly lower the needle through the fabric and watch if there is slack in the thread just above the fabric. If there is then this check spring needs to be adjusted. I hate to say this and its not just because I am a Bernina tech but its time for it to be serviced. many things might be the culprit. The distance between the hook and needle could be off for one more reason. Or something dirty or fluff under the spring the thread goes under on the bobbincase. Either a servicing or use the same color bobbin thread beneith is in order. Wish I could help more but you have tried a lot so I ruled those out such as tighter bobbin tension or looser upper tension or the combination of both.
Hi, I'm guessing you have the bobbin in the bobbincase upside down and its turning the wrong way. Or the machine is not thread correctly. Possibly there is junk in between the tension discs at the top that the thread goes between. Just some thoughts.
Hi, it may be possible that you put the bobbin in the case upside down and its turning the wrong way. Flip it over and try it. When looking at the bobbin in the case from the back and you pull the thread, it should turn clockwise.
Hope this helped as anything else may take a tech to diagnose.
It could also be the tension of the thread while you are threading the needle through the upper system. Keep a slight tension on that thread while doing it. Otherwise, make sure that the bobbin thread is 'coming' from the right position on the spindle.
turn your thread 3 turns to the right, clockwise,
then pass theend of the thread, under the coming thread and give it another 3 turns to the right.
For better results, always remove old thread from bobbin before filling it up.