How long since you've had the machine cleaned and lubed? Sounds like perhaps the selector mechanism has seized. I know this is a common issue with the older Bernina (Records) that require frequent cleanings and oiling (with good quality sewing machine oil or Tri-Flow Synthetic Lube).
THE MOTOR USUALLY HAS A LARGE SCREW. WHEN YOU REMOVE THE SCREW THE CARBON BRUSHES WILL SHOW. THERE IS USUALLY TWO. YOU CAN TAKE THEM TO A LOCAL MOTOR SHOP TO GET NEW ONES.
Bernina 930 Records are notorious for the basting stitch sticking which eventually locks up the machine. To prevent this from happening, be sure to run the basting stitch for a few minutes every month. If it is stuck, you'll need to take it to a Bernina technician.
If it is not the basting stitch, it could be a broken plastic gear (trip to the Bernina technician) or it needs oiling.
If it is not a broken gear, then it probably needs oiling. Your Bernina mechanical requires regular oiling and cleaning even if you don't use it (ie, every time you change the bobbin, every 8 hours of sewing, or every 6 months if not in use). HINT: recommend Bernina oil or similar good quality oil for mechanical machines, NOT 3-in-1 oil, WD-40, or cooking oil!!! One or two drops of oil in every oil hole and every place that metal part rubs against metal part.
Treat your Bernina well and it will serve you well for many years.
Use only good quality clear sewing machine oil from your Bernina dealer--ask them which is the correct oil for your machine. The likely place to oil is in the hook area (see page 44 of the manual). Be sure to apply a drop or two every 8 hours of sewing time. If you know your machine, you may notice a change in sound when it needs lube. Oiling anywhere else could damage your machine.
Do NOT place lube in any holes (as previously suggested) in the bed or top of the machine. These are not oil ports. They are holes for fastening accessories to your machine, ie circular embroidery unit, binding units, seam guides, etc.
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