I have a New Home Janome machine and since the needle hit a pin and broke it, the top thread now breaks. I have changed the needle and I am using good quality thread. Could it be that the feed plate teeth could be slightly damaged? It was working fine till this happened.
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I bet the food plate teeth are getting into it. On my machine, I can change the foot feed. If yours can be changed, try that.
It could be that or the needle plate is damaged, and the thread is tearing on that. You may need to replace either or both those parts.
Check for any burrs or rough spots in the needle plate that might have been caused by your needle breaking mishap. Burrs like this can cause fabric snares and thread breaks. Burrs can sometimes be smoothed with an emery board or fine sand paper.
Have you checked the the upper thread tension? It could be too tight. If it is then you can try lowering the tension (lower the number).
If you are still having problems try using this link to Janome support as they are always helpful and also have free manuals:
My needle broke so i changed it. Then I had days of having this same problem. The top thread kept breaking. Changed the thread, checked the tension, rethreaded numerous times, cleaned the machine, checked there as no damage to the dog feeder, checked the bobbin, made sure the needle was straight so I could see straight through the eye.
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