Lexmark 90P4000 Quick Reference Manual page 8

About your printer
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Move the paper guides to the sides.
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7 For legal‑size paper, extend the paper tray.
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Load paper with the printable side facedown.
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Adjust the paper guides to rest against the left, right, and bottom edges of the paper.
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Note: Make sure the paper is below the maximum fill line located on the edge of the paper tray.
Overloading the tray can cause paper jams.
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