Usual causes are: Weak or inconsistent thread.. Threaded wrong. Needle installed backwards or not seated. Incorrect tension or contamination in the tension control. The key to finding the problem is to manually turn the machine through cycles and watch at what point the thread breaks or is strained excessively.
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Usual causes are:
Weak or inconsistent thread..
Threaded wrong.
Needle installed backwards or not seated.
Incorrect tension or contamination in the tension control.
The key to finding the problem is to manually turn the machine through cycles and watch at what point the thread breaks or is strained excessively.