68 Troubleshooting Printed Surface Is Scratched/Paper Is SmudgedCause ActionPaper Feed Roller is dirty. Cleaning the Paper Feed Roller will wear the roller, so perform this procedureonly when necessary.For details on cleaning, see “Cleaning the Paper Feed Roller (Roller Cleaning)”on page 57.Inside of the printer is dirty. When performing duplex printing, if the specified paper size does not match theactual size of paper loaded in the paper source, the inside will become stainedwith ink, causing printed paper to become smudged.Perform the Bottom Plate Cleaning to clean the inside of the printer.For details, see “Cleaning the Inside of the Printer” on page 59.NoteTo prevent the inside of the printer from stains, set the paper size correctly.Printing on inappropriate type of paper. z Check to see if the paper you are printing on is not too thick or curled.See “Media Types You Cannot Use” on page 6.z When performing Borderless Printing, print quality may be reduced at the topand bottom edges of the paper. Make sure that the paper you are using issuitable for Borderless Printing.For details, refer to “Printing Area” in the User’s Guide on-screen manual.Printing on thick paper. Selecting the Prevent paper abrasion setting will widen the clearance betweenthe Print Head and the loaded paper. If you notice abrasion even with the mediatype set correctly to match the loaded paper, set the printer to prevent paperabrasion by using the printer driver.* Deactivate the Prevent paper abrasion setting once printing is complete. Ifnot, this setting remains enabled for all subsequent print jobs.Open the printer properties dialog box, and in Custom Settings in theMaintenance sheet, select the Prevent paper abrasion check box, and thenclick Send.To open the printer properties dialog box (Windows), refer to “Opening thePrinter Properties Dialog Box (Windows)” in the User’s Guide on-screenmanual.In the Canon IJ Printer Utility, select Custom Settings in the pop-up menu,select the Prevent paper abrasion check box, and then click Send.To open the Canon IJ Printer Utility (Macintosh), refer to “Opening the CanonIJ Printer Utility (Macintosh)” in the User’s Guide on-screen manual.