I had a similar problem with my 1469 back in 2005, so I took it to a sewing machine repair shop. They told me the computer chip had gone bad, and suggested I try to get a replacement that they would then install.
If you're still looking for an answer after all this time, you may want to try that. I never did, since my mother sent me her Pfaff shortly after mine died.
Cynthia, October 2010