Brother DS-720D - Manual (Page 46)

Scanner Calibration
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f Hold the edges of the Calibration Sheet and insert it into the feeder slot as shown below.
Click OK.
NOTE
Hold only the edges of the Calibration Sheet and be careful not to touch the white or black area. Leaving
marks or fingerprints on this sheet can cause errors in calibration.
g Scanning starts automatically.
h After the Calibration Sheet is scanned, a Calibration was successful message appears on your
screen, indicating that calibration finished successfully. Click OK to end calibration.
NOTE
If a Calibration failed message appears on your screen, remove the Micro USB Cable from your
computer. Reconnect the Micro USB Cable to the computer and perform the calibration again. If calibration
fails again, check the scanner’s print head to ensure it is clean.