http://www.brother-usa.com/ModelDocuments/Consumer/Software%20Users%20Manual/SUM_DCP_7030_7040_MFC_7340_7345N_7440N_7840W_EN_1650.PDFhere is the manual p4 and p16 discuss the topic:
Duplex printing 1
The supplied printer driver supports
duplex printing.
Guidelines for printing on both sides
of the paper 1
�� If the paper is thin,
it may wrinkle.
�� If paper is curled,
turn over the stack, straighten it and then put it back in the paper
tray or the Manual Feed
Slot.
�� If the paper is not
feeding properly, it may be curled. Remove the paper, straighten it
and turn over the
stack.
�� When you use the
manual duplex function, it is possible that there may be paper jams
or poor print quality.
If there is a paper jam, see Paper jams
in the User’s Guide. If you have a print quality problem, see
Improving the print quality in the
User’s Guide.
Manual duplex printing 1
The machine prints all the
even-numbered pages on one side of the paper first. Then, the
Windows® driver
instructs you (with a pop-up message)
to reinsert the paper. Before reinserting the paper, straighten it
well,
or you may get a paper jam. Very thin
or thick paper is not recommended.
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.
��
Manual
Duplex
Check
Manual
Duplex.
In this mode, the machine prints all the even numbered pages first.
Then the
printer
driver stops and shows the instructions required to re-install the
paper. When you click
OK
the
odd
numbered
pages are printed. There are six types of manual duplex binding
directions available for each
orientation.
��
Booklet
Printing
When
you want to print a booklet, use this function. To make the booklet,
fold the printed pages down the
middle.
��
Binding
Offset
If
you check the Binding Offset option, you can also specify the offset
for binding in inches or millimeters
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