How do i open my bernina 930. I have only my top open. The problem is that he stopt to saw.the wheel onthe right site do not move

SOURCE: Bernina 930 where to put oil

There are two key points I suggest customers can do themselves to help lengthen the life of their machine. One is your hook and the other is the needle bar...
Hook - Open your bobbin door, removee the bobbin case/bobbin. On the upper left corner there is a small latch, push in the latch and your shuttle race ring will fall down forward. You can now remove your stainless steel hook. You need to keep this hook clean and the lip it fits back into clean and void of lint and debris. On the back of this hook or the "lip" that the hook fits back into apply a small amount of hook/sewing machine oil.
Needle Bar - Open up your head cover, the needle and needle bar clamp is attached to a long stainless steel rod that travels vertically inside your head. All sewing machines have a needle bar that looks like this. This bar travels thru two brackets attached to the frame of the machine. Rotate your handwheel and clean the needle bar well of debris. Rotate the handwheel so that the needlebar is in it's highest point and apply a small amount of oil to the upper and lower bracket of the frame, rotate the handwheel so the needlebar slides back down and therefore lubricating it and the inside of the brackets.
Hook oil or sewing machine oil is relatively inexpensive from all quilt, sewing machine, repair shops.

Be sure to take your machine in a minimum of every three years for proper cleaning and lubricating of all the other parts (This is of course for average home sewing machine use 8hours a week)

SOURCE: Zig Zag Stitch not working

THis problem occurred as I was sewing on Neoprene. I was using Gutterman all-purpose thread and a size 80 needle. Tried switching to a size 70, then to size 90. Still unable to zig zag. After inserting a test sample of cotton, the zig zag worked perfectly, so I knew it was not a mecahnical problem. I switched needles again. This time to size 90 for stretch fabric. Voila! Problem solved.

SOURCE: bobbin cover door is stuck on Bernina 930 Electronic, and won't open. Can you help me?

Tricky !!! I dont know why the door is stuck, but its possible that the spring-loaded plunger in the top of the bobbin door is stuck into the cover of the free-arm. If there is suficient gap between the top of the bobbin door and the free-arm cover, you could try sliding a thin piece of metal or a very small flat-bladed screwdriver between the two, in the dead-centre of the bobbin door - that's where the plunger is located. By gently manouvreing the screwdriver in, you might be able to release it - be careful, because it's possible that the retaining circlip has dropped-off the bottom, in which case, the plunger and its pressure spring might fly out when the bobbin door opens. If that doesn't work, you could try unscrewing and removing the stitch plate and, again, with a small flat-bladed screwdriver, see if you can release the free-arm cover catch that's next to the top-left-hand-side of the bobbin door, but that's a very risky approach, because the feed-dogs will be in the way and you dont want to mangle any of the hook/shuttle parts etc. You need to find out why the bobbin door is not seated properly - it may be that the bottom hinge that also carries the hook/shuttle retainer has come out of the left-hand hinge mount in the free-arm. Good Luck.

SOURCE: Bernina 930 foot control cord

Not easily - the plug is molded-on so it's best to get a complete new cord - they're still available.

SOURCE: sewing machine wheel won't turn, motor whirrs

So it sounds like the motor is working but nothing happens? And the hand wheel works ok by hand but nothing when the motor is engaged.

You've broken a belt. I'm not familiar with the 930, but if it has an internal motor... take it in to have it done. It's way too easy to knock these out of time. Spend the extra cash and have it cleaned lubed and adjusted too.