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The screen may be out of calibration. Press the blue FUNC and ESC keys to launch the calibration app. Use your stylus to touch the center of each target as it appears. If this doesn't work, you are likely in need of a touch-screen repair.
Either the screen has failed. or the cable is disconnected. The cable that connects the screen to the main board. That cable is not user serviceable take the machine to a brother tech. I happen to be one but?
Does it respond to any touches or is it greyed out? This problem can be caused by either a bad touch pad or a defective scanner. Try accessing other options on the front such as the administrative menu. If those work, then the scanner might be bad or locked? Lift the automatic document feeder lid and check the lock on the left hand side to make sure the scanner is not locked. Restart the machine as well, could be an intermittent problem or static discharge.
NOTE: You must be a System Administrator to perform this solution.
Press the [Log In / Out] button on the Control Panel. The Login screen will be displayed.
Enter the System Administrator userID using the numeric keypad on the Control Panel, or select the [Keyboard] button on the Touch Screen to enter the userID, and then select [Save] on the Touch Screen.
If necessary, enter the System Administrator password using the numeric keypad, or select the [Keyboard] button to enter the password, and then select [Save] on the Touch Screen.
NOTE: The default userID is 11111, and the default password is x-admin (must be entered in lower case). If the userID and / or password have been forgotten, a service call must be placed.
Select [Confirm] on the Touch Screen. The System Administrator Menu screen will be displayed.
Select [System Settings] twice. The System Settings screen will be displayed.
Select [Common Settings].
Select [Maintenance / Diagnosis].
Select [Software Options], and then select [Keyboard].
Enter the Software Option password for the Scanner option using the keyboard on the Touch Screen.
NOTE: The password can be found on the inside cover of the Scan Manual and is case sensitive.