Bematech SB9015F - Limited Cursor Movement Area

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8) The cursor in the touch screen can only move in a small area or touch positions
are inaccurate.
(a) This situation usually occurs first time after installing the driver. Please run the
touch screen calibration program. We also recommend you to do this after changing
monitor resolution.
(b) Run the touch screen calibration program to do a 25-point recalibration.