Brother DS-620 User Manual page 54

Troubleshooting
Other difficulties
Difficulty Cause
I do not have or lost Causes may vary.
the Calibration Sheet.
I want to use a USB Causes may vary.
hub.
Suggestions
The special glossy calibration sheet that came with
your scanner will give you the best calibration
results. To order a new Calibration Sheet, please
contact Brother.
A USB hub may not be able to supply enough
power to the scanner.
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