Hi Mia:
If your machine is only a couple of years old, it is still under warranty and I would take the machine back to a good Bernina Technician. You will not be able to reset timing without the use of special "marking tools" and serious training.
The problem that you may have experienced is typical of the newer machines dating back to the Bernina series 130/140. The problem is that of these machines being easily forced out of "loop lift", that is to say, hook and needle timing. Typically and historically before the 130/140 series, Bernina machines were gear driven with machined flat spots on the associated drive shafting so that it was impossible to come out of timing. The newer method of manufacturing is to use soft steel shafting with hardened cupped pointed screws, so that when the machine is timed and the screws tightened, dig a circular spot on the shaft so as to hold the timing pulleys tight. I would be careful about attempting a repair yourself.
AlsaceTech eng@legacyquilt.com, January 2008
