ADF shading filter Note The shading filter and the scanning lamp are a matched set and must be replaced together. 1 Remove the ADF analog processor PCB. See page 155. 2 Remove two screws (callout 1) and lift off the front ADF lens cover (callout 2). 1 1 2 2 Figure 109. ADF shading filter (1 of 2) 3 Squeeze the sides of the back ADF lens cover to release four claws, and lift off the cover. 4 Remove one screw (callout 3) and lift off the ADF shading filter (callout 4). 5 4 4 3 Figure 110. ADF shading filter (2 of 2) C8523-90921 Internal 133