Be sure to use a brand new needle (130/705), that it is installed with the flat part facing the back of the machine, and the needle is pushed all the way up before the screw is tightened.
Make sure everything is threaded correctly. When threading the upper thread, ALWAYS RAISE the presser foot so the thread will seat in the tension disk.
If it still will not pick up the bobbin thread, it most likely has a timing issue, ie the needle is arriving at the bobbin at the wrong time to intercept the bobbin thread. Take it for service.
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