From the home screen, touch Settings > Paper > Tray Configuration > select a paper source.
Set the same paper size and paper type for the trays that you are linking.
From the home screen, touch Settings > Device > Maintenance > Config Menu > Tray Configuration > Tray Linking.
Touch Automatic.
To unlink trays, make sure that no trays have the same paper size and paper type settings.
Warning—Potential Damage: The temperature of the fuser varies according to the specified paper type. To avoid printing issues, match the paper type setting in the printer with the paper loaded in the tray.