Fujitsu fi-6000NS Operator's Manual page 200

3. Select a resolution level.
⇒
Selecting a resolution level returns you to the "Scan Settings" screen. The selected level
is displayed to the right of the [Resolution] button.
HINT
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If the [600dpi] resolution is selected, the [Auto] paper size may not be
selected and the [Custom] paper size Long Page mode cannot be used.
For more details about paper size and long page mode, refer to "4.7.3
Paper Size" (page 175)