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The feed dog control is the knob at the very bottom front, right side of the machine. If the feed dogs are not dropping, most likely the machine needs a thorough cleaning and OILING! I use Tri-Flow Synthetic Lube.
Most likely because your machine has not been serviced (oiled & cleaned) in a long time and the old oil has turned to glue and seized. This is probably the most common problem with mechanical sewing machines. A mechanical sewing machine should be regularly maintained..ie every 40 hours of sewing use or at least every six months when not in use. You may want to take it to a Bernina service technician. Ask for a bottle of Bernina oil for CB hook machines and ask if they will show you how to oil it.
Is it a new 830 computerized model or the older 830 Record mechanical?
If it is the 830 Record, it needs oiling--1-2 drops of good quality sewing machine oil (specifically concentrate on the stitch selector lever and oil the metal parts that move against other metal parts) Do NOT oil the cams, plastic gears, any rubber parts, ie belts, bobbin winder wheel. Bernina 530 through 830 Record Oiling Diagram
Be sure to oil your machine regularly. Use Fresh "good quality" sewing machine oil. Apply 1-2 drops of oil every place shown in the instruction manual (look for the little oil ports/holes). Do NOT oil rubber, plastic, leather, or belts.
Have you ever done a thorough internal oil of your machine? These mechanical machines rely on oil to keep moving but, over time, that oil dries and starts to stick things together. I do a deep internal oil about annually and oil the hook at least every 8 hours of sewing.
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