If there is a tint while scanning white documents, what can be done?

If tinting is seen while scanning white documents and auto brightness is not able to compensate.  It is probably time to see the scanner.  First try cleaning the scanner.  Also use the canned air to spray the dust from the right to the left.  Never spray left to right, the circuit boards are on the right. If the tinting is still there, run camera calibration.  That will readjust the cameras and clean the back ground.