What could be causing uneven darkness in my printout?

• Your paper may be moist or damp. Do not store your paper in a humid or damp environment. Make sure the paper type is correct. Check whether the printer is in Toner Save mode. Confirm if the density setting is light. Turn off the printer. Take out the developer cartridge, shake it gently from side to side and then from front to back to distribute the toner evenly, and then reinstall it. If this does not solve the problem, install a new cartridge. For more information, see "Replacing the developer cartridge" in your user's manual. Then print several pages to check the print quality.