I've been using Mandriva LE2005 with an Epson Stylus Photo RX510. The scanner runs fine. I use it for normal scanning and for transperancies. The problem I have is that the printer doesn't eject the last page of a print run. I'm afraid I don't know enough to provide technical help, but I thought it might help to know that someone with LE2005 and a similar printer can get it going.
Have you tried configuring the scanner as RX500?