Canon imageCLASS 2300 Reference Manual page 129

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6-4 Paper Drawers
Push down the metal plate until it locks in place.
Load the paper into the paper drawer.
Even out the edges of the paper stack. Load the paper stack against the right
wall of the paper drawer.
When loading paper in the paper drawer for the first time, set the size plate to
match the paper size being loaded.
When loading paper in the paper drawer, make sure that the paper size setting of
the paper drawer matches the size of the paper.