@davidakin,
I'm IT mgr for a Sharp Dealership here in US. The easiest fix is to download the Unix CUPS file from SharpUSA. Unpack to desktop, and open with text edit. In the ppd file, go to the last line (right before the end statement) and add this line:
*cupsSNMPSupplies: False
Place this file in %MacDisk%/library/printers/ppds/contents/resources
Install the printer using lpd, and in "print using dialog" choose other, and a finder window will open. Browse to the location of the modded cups ppd, and doubleclick on it.
The has worked to restore printing with all of out customers.
Also, I have modded a few ppds, and have some detailed instructions with screen shots located on our extranet site located at:
http://www.appalachiamail.com/downloads/MacOs10.6.8PPDs/
Please note that as will any community content, this fix IS NOT endorsed by Sharp or Apple, and needless to say, use at your own risk.