Lexmark CX517 User Manual page 44

Loading paper and specialty media
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If the paper is longer than letter‑size paper, then squeeze and then slide the length guide at the back of the
tray to extend it.
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Squeeze, and then slide the length guide tab to the correct position for the size of the paper being loaded.
Note: Use the paper size indicators on the bottom of the tray to help position the guide.
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