Comment 5 for bug 855412

I have looked into your long error_log. All jobs except job 305 seem to be correctly handled by CUPS and the filters. Only job 305 considered a job with the title "Test Page" as a command file (printer maintenance commands to print nozzle check pages and clean nozzles on inkjet printers). Due to the title I doubt that you have clicked "Print Self-Test page" or "Clean Print Heads" in the properties window to generate the job (or did you actually do so?).

Can you scan/photograph the pages with garbage and attach the images? Can you print the configuration page of the printer (via the printer's front panel menus and tell me which languages the printer uderstands according to this page? Or simply also scan/photograph the page?

Did you check whether the paper size setting is correct after each change of the driver (should usually be overtaken to the new driver)?

Have you already tried turning off the printer and turning it on again?