If background scatter covers the entire surface area of a printed page,adjust the print resolution through your software application or in PrintingPreferences (See Opening printing preferences).Misformed characters If characters are improperly formed and producing hollow images, the paperstock may be too slick. Try different paper (See Print media specifications ).If characters are improperly formed and producing a wavy effect, thescanner unit may need service (See Cleaning the scan unit ).Page skew Ensure that the paper is loaded properly.Check the paper type and quality (See Print media specifications ).Ensure that the guides are not too tight or too loose against the paper stack.Curl or wave Ensure that the paper is loaded properly.Check the paper type and quality. Both high temperature and humidity cancause paper curl (See Print media specifications ).Turn the stack of paper over in the tray. Also try rotating the paper 180° inthe tray.Wrinkles or creases Ensure that the paper is loaded properly.Check the paper type and quality (See Print media specifications ).Turn the stack of paper over in the tray. Also try rotating the paper 180° inthe tray.Back of printouts are dirty Check for leaking toner. Clean the inside of the machine (See Cleaning theinside).Solid Color or Black pages The toner cartridge may not be installed properly. Remove the cartridge andreinsert it.The toner cartridge may be defective. Remove the toner cartridge and installa new one (See Replacing the toner cartridge).The machine may require repair. Contact a service representative.Loose toner Clean the inside of the machine (See Cleaning the inside ).Check the paper type and quality (See Print media specifications ).Remove the toner cartridge and then, install a new one (See Replacing thetoner cartridge).If the problem persists, the machine may require repair. Contact a servicerepresentative.Character Voids Character voids are white areas within parts of characters that should be solidblack:If you are using transparencies, try another type of transparency. Because ofthe composition of transparencies, some character voids are normal.You may be printing on the wrong surface of the paper. Remove the paperand turn it around.The paper may not meet paper specifications (See Print media specifications).Horizontal stripes If horizontally aligned black streaks or smears appear:The toner cartridge may be installed improperly. Remove the cartridge and