Dell 1600n Owner's Manual page 40

Pinch the paper width guide, as shown and move it towards the stack of paper until it
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lightly touches the side of the stack.
Insert and slide the paper tray back into the multi-function printer.
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Set the paper type and size. For details, see page 35.
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Loading Pr int Media
NOTE: Improper adjustment of paper guides can result in paper jams.