56CLEANING THE LASER UNITWhen the laser unit inside the machine becomes dirty, line-like color irregularities (colored lines) may appear in the printimage. When the following conditions appear, clean the laser unit.Identifying lines (colored lines) caused by a dirty laser unit• Colored lines always appear in the same place. (The lines are never black.)• The colored lines are parallel to the direction of paper feeding.• Colored lines appear not only when the copy function is used but also when the printer function is used. (The problemappears during both printing and copying.)1Open the front cover.2Take out the cleaning tool for the laserunit.The cleaning tool is attached to the front cover.3Release the waste toner box.Press the waste toner box release button.The waste toner box will fall forward as shown.Gently support the box with your hands as you let it fall forwardas far as it will go.