The silver marks on the bobbin are part of the sensor. Try changing bobbin. Also, after the bobbin case swings out the little sensor eye is on the rear frame (about 1 o’clock). Use a flashlight to check if it is obstructed
Perhaps the bobbin thread sensor is dirty.
SOURCE: bernina 830, worked fine until today... think it
there is a board inside the foot pedal that goes out sometimes you can check this by flipping the foot pedal upside down and at the top right there is a small hole where you can adjust the speed with a flat head screwdriver but be gentle it breaks easy, if its out you can take it to a bernina dealer and they might have a reapired one or they can send yours off for repair since that part is repair only
SOURCE: Top cover on my Bernina 830 is crooked
there are two screws on the top one by the bobbin winder and the other by the take up lever, you should be able to adjust it from there
SOURCE: old bernina 830 stitching problem: tight
Sounds like you need to adjust the tension. Probably a good idea to oil this older machine before you adjust. Also look for and clean out any lint or debris in bobbin case and around foot area.
SOURCE: Purchased a new Bernina 830 and need an easy way to thread bobbin
Pull the thread in the groove of the bobbin case and pull the thread to the left straight and up a bit. I discovered this helps to center the thread in the split where it needs to be.
Hope this helps
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