My machine Bernina 830 does not run.

Question

Hello: I can not move the k**b for button hole the adjusting k**b for straight stich and zig zag is stopped in (2) and go to (4) but didn t stay, because come back to (2)the left center - rigth adjusting k**b (needle position) is stopped and can not move.Bernina 830 in the manual identified with numbers: 19, 20, 21Thanks for your helpRose Mary Lucas