Put the stitch length on the longest stitch and see what happens, I can't remember if your machine has a reverse button or lever, if you have the button push it in and out a few time time and if anything is stuck it should free it off, failing that get to the inside of the machine and spray some WD40 around the stitch length area, I can give you a list of sites for manuals if you e-mail me, I will attach them, too many to type up.
Ken
drivewithken@blueyonder.co.uk, September 2008