As usual, I cannot supply a detailed answer, but can tell you where to try to get information.
Go to http://www.gpbwebworks.com/fwinfo/manual.shtml there is a 2006 offer to sell photocopies of manuals. If you wish, you can call the number listed and see what you get for the $10 price for that model. Or, google for other sources.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix sewing machines.