Fujitsu ScanSnap N1800 Operating Manual page 440

4. When you are satisfied with the LCD touch panel response, press the
[Update] button.
This saves the current calibration data, completing the calibration process, and
returns you to the [Screen Calibration] window.
If the red "+" (adjustment mark) is not touched accurately, a "Parameter Error.
Please input, again" message may appear.
In this case, perform the calibration from
each calibration point accurately.
7.7 Calibrating the LCD Touch Panel
Step 2
440
again, being careful to touch