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Re: Bernina Virtuosa 160
First the simple solution. Make sure your needle is inserted flat side to the back and all the way up.
The only other thing I can think of is that your hook is out of time and this will take a technician to re-time it. You may need to take it in for a servicing.
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Here is a link to a sewing machine part company where you can order the manual. It is $19, but I think well worth it if you have the machine. Good luck! That is a nice little machine. http://www.sewingpartsonline.com/instruction-manual-bernina-virtuosa-160.aspx
Did you mention this specifically to the repairer? Could be a number of things ..... needle, timing, needle clearance to the hook, burred hook...... all of which should have ben checked when it was serviced. Was there a sample (sewn out by the repairer) with the machine when you picked it up? ie to 'prove' it was working correctly.
Is this the top thread or your bobbin thread? The technician should have pulled out the tension disk assembly and cleaned it, not just spray more lubricant/cleaner on it. Is this a Bernina certified shop?! Take it back and get him to do it again right, it sounds like carbon/dirt build up in the disks. Have him pull the assembly apart and make sure it's not something else wrong with the disks themselves like oxidization etc.
If it's your bobbin thread.. your bobbin case is just dirty and the spring needs to be cleaned.
The thread doesn't really touch any other parts of the machine, hopefully your technician isn't using grease as this just causes more headaches for attracting more lint and then dirt.
It looks right but its not. Try looking on the internet for threading instructions. The bobbin winds in two directions, I have never saw a Bernina but I have 2 new machines and the thread goes in and then threads back to the left. Its hard to describe. But if the bobbin isn't right it will not pick up the thread. Write to Bernina for instructions. There are websites that have the directions for free.
This unfortunately sounds dismally like a timing problem. When a sewing machine makes a sudden mechanical stop as when a needle is bent slightly and hits the needle plate, sometimes the other machine bits revolve along further causing the needle to be introduced into the hook either to early or to late to catch the thread.
To test this, remove the thread, the needle plate and and the bobbin case. Replace the needle with a brand new one. Yes, again. Revolve the machine by hand via the balance wheel and watch closely as the needle goes into the hook region allow it to it move down and then just start to move up. If the tip of the hook is not pretty close to right behind the needle than it is more than likely a timing problem.
If the tip of the hook is behind the needle in the scarf (the slight hollow on the back of the needle) than it is not timing. Thread the machine normally like it is and watch what happens as you manually turn the machine via the balance wheel. The thread should catch and be pulled around the hook and let go.
Try this and then either you figured it out the problem or contact me again. Either way please vote. Thanks