You may have to check the needle /bobbin position timing. This can change especially if the needle has been knocked out of plum during sewing and momentarially hit the bobbin case. Needle /bobbin timing notes are available on the net and as the timing is the same for all machines any pdf page you find explaining how to check and adjust it will do.
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You may have to check the needle /bobbin position timing. This can change especially if the needle has been knocked out of plum during sewing and momentarially hit the bobbin case. Needle /bobbin timing notes are available on the net and as the timing is the same for all machines any pdf page you find explaining how to check and adjust it will do.