My fax won't print, neither faxes nor copies. The paper goes through & it makes sounds like it is printing but nothing on the paper. The machine says the ink level is 6/8. I "aligned" and "cleaned" the ink catridge, but nothing yet. Any ideas?

Your Printhead is Faulty. Needs Replacement

? Printing All Unprinted Documents in Memory
1 Press [Menu].
2 Use [{] or [}] to select , then press [Start/Copy].
3 Use [{] or [}] to select .
4 Press [Start/Copy].
The fax prints the documents one at a time, after each the reception number is displayed on
the LCD.
5 After printing, the LCD displays .
6 Press [*] to delete the previous printed documents.
If you want to keep the documents in memory, press [#].

The Fax Drum Is The Heart Of The Machine.When you scan a page to send a fax or copy the Image of that is processed through laser unit & printed on the drum & after that the drum rolls on & prints the image on the paper & then the paper passes through the Heat Roller & the image is pressed on it & the copy or fax comes out.

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try and make a copy with the fax... if it comes out the same way... turn the paper face up if it was face down or vice versa and try again... if it works then fax the same way and see what happens... if all goes well then keep copying and faxing that way... if that works but fax does not work... print an internal report... if that does not print then you have main board problems... if internal prints print then you have a problem with your ccd... thats a big long strip that rests right under the keyboard... thats what does the scanning... if that is bad... then when you fax... or copy it will be blank or black... depending on what is blown on it...

I’m happy to assist further over the phone at https://www.6ya.com/expert/norman_d2fa496dce30c65d

http://www.brother-usa.com/ModelDocuments/Consumer/Software%20Users%20Manual/SUM_DCP_7030_7040_MFC_7340_7345N_7440N_7840W_EN_1650.PDF

here 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

TRY CLEANING THE PAPER ROLLER WITH DENATUYRED ALCAHOL OR MAY BE THERE IS SOME THING STUCK IN THE MACHINE GO AHEAD AND LOOK GOOD LUCK BROTHER TECH

just check there wilkl bi mention face up or down .if not mention no problem just make a copy by putting face up and one copy by putting it face down.one time u will receive white copy and one time u will receive print on paper .when u will receive print check this is face up or down .after confirm just send fax

Make sure the side guides in the paper cassette are snug up against the paper.

The paper could be whacking a scrap of paper on its way through and skewing.

make sure there is nothing stuck in paper path or the scanner lens is not dirty.

take out toner/drum tray and reinsert it to make sure nothing is preventing drum from turning or stuck.

then try to use

Will the machine run a paper path test?
This sounds like it could be a sensor indicating a paper jam, if this is the case, it won't run anything through the paper path (not even a blank page).