I had a 7530 that I bought in 1999. I loved that machine. I traded it in 2 years ago. If you can, call a Pfaff dealer to see if you can replace the motherboard and at what cost. It may not be worth it even if it is possible. Also ask if there are parts that would be useable.
I'm sorry your machine died. The 75 series of the Creative Pfaff are great machines.