I've got a Ricoh 4430NF that is acting very strangely. If you scan a document to email, or print a document from the self-test or a computer, it prints fine. But if you use the copy function, there will be dust all over the back of the paper, and the top 1/3 of your page is mostly missing. Again, the scanner works fine, the printer works fine, the copy function - not so much. Is there any particular settings in service mode that may allow me to 'tweak' this? I've tried resetting to defaults, but that seems only to reset the basic settings, not the service settings.