My Brother HL-2070N was not working in Leopard, either wirelessly or by ethernet. It kept saying it couldn't open the raster file or something like that. To fix this, download the newest version of Gutenprint for Mac OS X & use the Brother HL-1270N printer instead of the 2070N one. This works now for me.
I had problems after an upgrade too. My 2070N is hardwired to my home network and when I tried to print, it said something like "printing to rasterbrother2030 failed." I reinstalled the Brother drivers from the Leopard disk and it eventually worked.
This thread has been closed by the system or the community team.
You may vote for any posts you find helpful, or search the Community for additional answers.
Brother HL-2070N Not Printing in Leopard
Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.