Fujitsu ScanSnap N1800 Operating Manual page 424

7.3 Cleaning Inside the Scanner
4. Close the top cover.
You should hear a click.
Be careful that the top cover does not shut on your fingers.
Confirm that the top cover is completely closed. If not completely closed,
document jams and feeding errors may occur.
When closing the top cover, do not slam it shut by pushing the LCD touch
panel as this may damage it.
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