Important: calibrate the scanner only if the scanned image looks fuzzy, deformed or if the color looks abnormal (e.g. darker or lighter than normal).

• Remove the microSD card from the scanner.
• Press the power button for 3 seconds to power on the scanner.
• Press and hold the JPG/PDF/up button. While holding that button push the Enter button.

• Release both buttons simultaneously to enter the auto-calibration mode.
• The following message appears on the LCD screen: "1. Insert the calibration sheet".
• Insert the white calibration sheet as the arrow indicates with the text side facing down.
• The scanner will now start scanning the calibration card. During the scanning process the scanner will stop for a moment. Meanwhile the following messages appears: "2. Calibration in progress!". 
• Wait for about 40 seconds. The scanner will finish scanning the rest of the card.
• When the message "3. Calibration completed!" appears, the calibration has been completed.
• Press any button to power off the scanner.