Flatbed shading filter Note The shading filter and the scanning lamp are a matched set and must be replaced together. 1 Remove the flatbed optical unit. See page 134. 2 Remove seven screws (callout 1) and remove the RFI cover (callout 2). 1 1 2 2 Figure 120. Flatbed shading filter (1 of 3) 3 Squeeze the sides of the lens cover (callout 3) to disengage four claws, and remove the cover. 3 Figure 121. Flatbed shading filter (2 of 3) C8523-90921 Internal 139