Brother MFC-9120CN - Manual (Page 13)

Printing
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1
Simultaneous scanning, printing and faxing
1
Your machine can print from your computer while sending or receiving a fax in memory, or while scanning a
document into the computer. Fax sending will not be stopped during PC printing. However, when the machine
is copying or receiving a fax on paper, it pauses the PC printing operation, and then continues printing when
copying or fax receiving has finished.