Brother MFC-9120CN - Manual (Page 141)

Printing and Faxing
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f Choose the printer name and make sure that Brother is shown in Printer Model (Print Using).
Select the printer name that shows BR-Script in the Model Name (Model), and then click Add.
(Mac OS X 10.3.9)
(Mac OS X 10.4.x)
g Choose Quit Printer Setup Utility from the Printer Setup Utility menu.