it doesn't look good with drivers for sharp-printers.
You'll need a ppd file for this printer or a similar printer from sharp. Here: http://www.openprinting.org/printer/Sharp/Sharp-AR-161
you'll find at least ppd files for sharp. I'd guess you'll have to try out if there is one working with your printer.
I've searched on the sharp-downloadsite, but they only have drivers for Windows.... I'm wondering what do people with a Mac??? You know cups is a product of Apple, maybe one can find help looking for Mac-drivers.