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The front panel circuit board has a microswitch which is activated mechanically when the bobbinwinder is moved to the winding position. The error is most likely with the microswitch stuck in one position. The remedy requires you to have moderate mechanical aptitude. The best thing to do would be to take it to your dealer for repair. If you want to try to do it yourself, here you go:
DO NOT REMOVE THE SCREW HOLDING THE SMALL PLASTIC BOBBINWINDER STOP NEXT TO THE BOBBINWINDER SPINDLE
Open the top lid and, with a straight slotted screwdriver, remove the two large silver screws
Close the lid and raise the handle into the carry position
Loosen, but don't remove, the small phillips screw underneath where the right side of the handle rests
Pull the top of the right side cover over slightly
Remove the small phillips screw underneath where the left side of the handle rests
With the handle up in the carry position and the lid closed, lift the entire top cover from the left side first, exposing where the handle attaches underneath
Carefully bend the lower part of the handle to the right and detach it from its mount
Remove the top cover and handle
With the top cover removed, you can see the bobbinwinder arm make contact with the microswitch
If you are extremely careful to not touch the circuit board with your bare fingers or with a metal object, you can manually press the microswitch to see if it works
The plastic microswitch "button" may have become detached
The "spring" on the end of the bobbinwinder arm may have become bent
Hi, most likely your bobbin sensor is being blocked by something. Common causes are a dirty sensor. Q-tip on the eye of the sensor inside the bobbin door. Or there is fuzz blocking it. Next take out the bobbincase and the bobbin. Look in the bobbincase and you will see a round spring. This spring acts like a brake for the bobbin. Sometimes these springs will get moved and out of position blocking the little space that the bobbin sensor reads through. Reposition the spring so you can see through it and the bobbincase.
That should do it.
Good luck.
Rick Engel
Bernina tech
The motor running noise is because your bobbinwinder is on. Flip the bobbinwinder to the right.
Rick
Bernina rech
(don't feel dumb, it happens to many)
For a 640: Make sure the machine is off then Press the reverse button and the needle up/down button at the same time and keep pressing while turning on the machine until the service screen come up. Select the "i" icon and then the icon that has a picture with the clock and a question mark. That will show you the hours and stitch count used. To exit the service program just turn off the machine.
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