Brother MFC-8640D - Manual (Page 9)

USING THE MACHINE AS A PRINTER 1 - 2
How to print your document
When the machine receives data from your computer, it begins
printing by picking up paper from the paper tray. The paper tray can
feed many types of paper and envelopes.
1
From your computer select the Print command.
If your computer is also connected to any other printers, select
Brother MFC-XXXX or DCP-XXXX (USB) Printer (Where
XXXX is your model name) as your printer driver from the Print
or Print Settings menu in your software application, and then
click on OK to begin printing.
2
Your computer sends a print command and data to the machine.
3
The LED blinks in yellow and the machine starts to print.
If your application software does not support your custom paper size,
select the next largest paper size.
Then adjust the print area by changing the right and left margins in
your application software.
You can select the paper size and orientation in your application
software.