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Do not use excessive force when removing or attaching the retard or feed rollers. Doing so may cause the rollers to become deformed, resulting in feed errors .
Scratches on the scanning glass may cause streaks on scanned images, as well as feeding errors . If there are scratches on a scanning glass, contact your authorized Canon dealer.
Rotate the rollers on the panel unit side while cleaning them. Do not rotate the rollers on the opposite side, and remove dirt on the visible portions only. Forcefully rotating the rollers on this side may cause feed errors .