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 When attaching the scanner stop arm, make sure the black sticker faces up. (The blue rectangular below shows the location of the sticker.)
(VII) Remove the FAU and scanner unit. - Lift the FAU out from the hinge holes of the scanner unit. - By pulling both sides of the main unit slightly outward, detach the scanner unit from one side, then the other.
(VIII) Remove the paper support. - Disengage one side of the paper support from the main case, then the other side. (The photo on the right ahows the main case unit with the external parts removed.)