Canon imageRUNNER ADVANCE C5255 Series Service Manual page 1114

12) Install the Copyboard Cover Unit.
13) Remove the White Plate.
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Installation > Platen Cover Type S > Installation Procedure > When installing to iR-ADV C5255/C5250 (Duplex Color Image Reader Unit)
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9 Installation > Platen Cover Type S > Installation Procedure > When installing to iR-ADV C5255/C5250 (Duplex Color Image Reader Unit)
Place the White Plate on the Copyboard Glass by aligning it with the Index Sheet.
Close the Copyboard Cover, and then open it again.
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