There's a couple of groups on Yahoo that deal with those machines. I think they might have links to some of these sites. There's one for the Pfaff 2170, and I've seen posts about your machine there.
Sew-What's-New has one.
Most of the stuff in the reference guide should be in the manual except a new reference guide just might be better written. There's probably tips and tricks.
http://pinterest.com/sewingexpress/p...are-tutorials/