I am sorry that you are having some difficulties with your sewing machine and I will be happy to help. I did some research and I was able to find a link that will provide you with some good information. I hope this helps with your research while you wait for your expert response.
Thank you Joseph, that was very helpful. Turns out the feed dogs are only moving up and down, not forwards and back. My husband already has it apart, exposing the gears and belts. We are still not sure what the problems is, he says the plate isn't moving properly.