Oce CS2436 User Manual page 452

Handling Paper (CS2436-6)
Load a single sheet printing-side up in the Paper Feed Slot, with the right edge aligned with the Paper Alignment
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Guide (a) to the right of the Roll Cover.
Insert the paper until the leading edge makes contact and you hear a tone.
Move the Width Guide (a) carefully to match the size of paper loaded.
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Set the Width Guide against the edge of the paper to prevent the paper from becoming crooked or wrinkled.