Fujitsu ScanSnap N1800 Operator's Manual page 365

7.3 Cleaning Inside the Scanner
4. Close the top cover.
You should hear a click.
ATTENTION
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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