Dell 1600n Owner's Manual page 38

If you load longer that is longer than a standard (Letter or A4) size, such as legal paper,
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press and unlatch the guide lock, then slide the paper length guide out completely to
extend the paper tray to its full length.
Flex the sheets back and forth to loosen them, and then fan them out. Do not fold or
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crease the print media. Align the edges on a level surface.
Insert the paper stack into the paper tray with the side to be printed on facing down.
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Loading Pr int Media