PFAFF 7570. Hello,I have a pfaff 7570, and am having problems with what I believe to be the

Question

Hello,I have a pfaff 7570, and am having problems with what I believe to be the tension.When using in the freemotion, with feed dogs down and in the embroidery position, it works fine. When I raise the feed dog, and lower to the normal sewing position, it will not make a balanced stitch.The bobbin thread is full of loops, and not catching the top thread.Can you help me?Suzi PriceVermont