All our printers including the Brother MFC have static IP addresses, such as 192.168.0.107. First thing we did was to delete the old printer drivers and scanner drivers and re-install Brother suite fresh from the original CD. All printers (4 of them) print fine, including the brother.
When opening the scanner driver in Scanners and Faxes and clicking on test scanner, a dialog box come up called "Test failed": "The test failed because the device is not available. Verify connection and try again." In the Properties dialog box for the scanner, on the Network Setting tab, I chose "specify your machine by name" and then browse. Scanner was found with a Node name of BRN_369089 and the same IP address 192.168.0.105 and the correct model MFC-8820D. However selecting this just gives the same "Test failed" dialog box. In the General tab for the scanner, the Scanner Status reads: Status: Device Ready, On Port: AUTO, and resolution: 300x600 DPI.
When double clicking on the Brother scanner icon, the scanner and Camera Wizard dialog box opens. Clicking on Preview which used to work fine now shows a traveling bar, waiting for scanner, and then another dialog box comes up and says: An error occurred during preview. If the scanner is being used, please wait for it to complete the task, and then click Preview.