Great helpful videos from a Bernina technician called Jeff somewhere in the USA.
I put a comment on one of his videos about adjusting bobbin tension and he said not to do that on 770 machines. For that reason I bought a new bobbin case which I have never adjusted but I have the old one marked with a black dot tucked away in case I ever change my mine.
This one has lots of tips and tricks for threading, oiling, cleaning and fixing frozen machines. Specific 770 issues are later in the video.
All about the bobbin case, cleaning sensors, turning off sensors and oiling.
Do not sew with your bobbin door open!
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