Fujitsu ScanSnap N1800 Operator's Manual page 419

3 Open the top cover.
4 Lightly press a soft cloth slightly moistened with Cleaner F1 or the Cleaning
Wipe against the surface of the feed rollers.
5 Press the [Cleaning] button on the [Roller Cleaning] window.
The feed rollers and eject rollers rotate for a fixed length of time.
Gently clean the rollers as you rotate them.
Pressing the [Cleaning] button seven times will simultaneously turn the
feed rollers/eject rollers approximately one complete revolution.
The feed rollers and eject rollers should be cleaned carefully and
thoroughly, as dirty feed rollers can adversely affect the paper pickup
performance.
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.
When cleaning the feed rollers or eject rollers, be careful not to touch
the rollers with your fingers while they are rotating.
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