SOLVING PROBLEMS7.18Curl or wave • Check the paper type and quality. Both high temperature andhumidity can cause paper curl. See “Paper Specifications” onpage G.3.• Turn over the stack of paper in the tray. Also try rotating thepaper 180° in the tray.• Try printing to the face up output slot.Wrinkles orcreasesEnsure that the paper is loaded properly.• Check the paper type and quality. See “Paper Specifications”on page G.3.• Open the rear cover and try printing to the rear output tray(face-up).• Turn over the stack of paper in the paper tray. Also tryrotating the paper 180° in the tray.Back of printoutsare dirty• The transfer roller may be dirty. “Cleaning the Inside” onpage 6.7.• Check for leaking toner. Clean the inside of the printer.Black pages • The toner cartridge may not be installed properly. Removethe cartridge and reinsert.• The toner cartridge may be defective and need replacing.Install a new toner cartridge.• The printer may require repair. Contact a servicerepresentative.Problem SolutionA