These are possible solutions. Try one or more of the following:
Make sure the document or photo is loaded facedown on the scanner glass in the upper left corner.
Make sure the paper size setting matches the paper loaded in the tray:
From the printer control panel, check the Paper Size setting from the Paper menu.
Before sending the job to print, specify the correct size setting:
For Windows users, specify the size from Print Properties.
For Macintosh users, specify the size from the Page Setup dialog.
Remove and reinstall the toner cartridge, making sure that it is aligned correctly.