Lenovo 3000 C315 User Manual page 26

3. When the calibration screen appears, use your finger to touch each of the 4
calibration points that are shown in sequence. After finishing these operations,
the calibration screen will disappear, and the screen calibration is complete.
Attention: While in use, whenever the touch screen reacts in a different
place from where you are touching it, or it stops reacting, just start the
calibration program.
Please touch the target point shown on the display.
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User Guide