Could be a host of things to trouble shoot,
Needle, is it sharp and right size for fabric type? Sharp for woven or ball point for knit
Is threading up correct, you don't say which model but this is link to threading a Star Series SU
http://youtu.be/xEn3dNeiTqs
Is bobbin wound nice and smoothly, also should be Elna 7hole bobbin which is slightly dished and holes one side. Always wind with holes on top and load same way, when you draw thread off bobbin will rotate anticlockwise. Also check bobbin thread has clicked into tension spring. You will hear it click in. If you lift upwards and thread comes free then try again, push down on thread with finger tip till it clicks into spring.
Is top tension dial clean between discs, always thread with presser foot raised so thread goes into tension fully. Is thread in take up lever, and through all thread guides?
Top tension dial on 5
That's my regular trouble shooting list, hope it helps or add more details
SOURCE: elna tavaro won't stitch
Sounds like either some thread jammed in the bobbin area, or possibly it got knocked out of "time"-as you know a sewing machine is just that-a well tuned machine that has movements that have to occur in sequence. Were you sewing anything heavier than normal? I have knocked my Janome out of "time" twice by sewing something too heavy for the needle or the machine in general. I have also had thread wad up under the bobbin. Re-alignment or whatever they call it is not real expensive but would result in some downtime for your machine.
SOURCE: l have an elna sewing but no model number, it says
That is the exact model, there is no number.
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