Dell 1600n Owner's Manual page 77

If the document is jammed in the paper exit area:
a Open the document cover and turn the release knob to remove the misfed
documents from the ADF output tray.
b
Close the document cover. Then load the documents back into the ADF.
If you cannot see the paper or the paper does not move when you pulled, open the
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document cover.
Turn the release knob so that you can easily seize the misfed document, and remove
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the document from the roller or the feed area by carefully pulling it gently to the right.
Close the document cover. Then load the documents back into the ADF.
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Troubleshooting