I just got a Bernina that hasn't been used for probably 10-20 years but worked fine the last time it was used as far as I know. I oiled it and it will work fine for about 30 seconds then things stop moving but I hear the motor running. I can still move the hand wheel and feel it loosen up after a few turns and it will work again for about 30 seconds then the same thing happens. Any suggestions? I would like to avoid taking it somewhere for repair if possible.
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Bernina 730 Record not working?
Could be a belt slipping - worst case google sewing machine repair shops in your area.
You probably need a new belt:
https://www.sewingpart.com/Motor-V-Belt-13-3-4-350...