Fujitsu ScanSnap N1800 Operator's Manual page 423

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.
When the button is pressed, the feed rollers and eject rollers rotate slightly.
Pressing the button continuously rotates the feed rollers and eject rollers
for a fixed amount every few seconds.
Gently clean the rollers as you rotate them.
Stop pressing the button to stop the rollers rotating.
The feed rollers and eject rollers should be cleaned carefully and
thoroughly, as dirty feed rollers can adversely affect the paper pickup
performance.
Pressing the [Cleaning] button seven times rotates the feed rollers and
eject rollers approximately one complete revolution.
When Help is shown, close it before pressing the [Cleaning] button.
6 When you have finished cleaning the rollers, press the [OK] button, and
close the [Roller Cleaning] window.
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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