Replacing Toner My Brother MFC-9440CN wil not print even in black ink. It says yellow toner life end. Do I have to replace all of the toner cartridges for it to print even the black?

I fail to see why you are covering up the toner sensor led's when you have a new cartridge fitted?
Also if you are using a recycled toner from a very well known uk shop that refills toners and ink then you may well have broken the drive gear that stirs the toner. i have seen this six times and their toners do this.
It could well be one of the pitfuls of recycled toners.

I done on my brother lh3070cw printer cartridge on Message "Low Toner"

First I take off toner cartridge
second - Covered the both Glass Buttons of Cartridge situated right and left side of cartridge (all cartrideg) for Black Electric Tape.

thent install the cartridge in the printer again.

after install the cartridge press SECURE PRINT AND CANCEL BUTTON SAME TIME AND CLEAR THE STR AND STD FOR PRESSING ok BUTTON FOR 2 TIME.
ERASE EACH STR AND STD
THEN PRESS CANCEL

YOU CAN USE YOUR PRINTER FOR END OF THE TONER

Hi there !

If you are self refilling the toner cartridge, the roller drum can be damage due to wear and tear. I need to replace new toner cartridge other i will getting wider and wider on both left and right of the paper.

If you want to reset your Brother MFC 9440N machine so you no longer have the error message: Toner End of Life, do the following:

1. Open the front cover of the 7820N, that is, the cover that allows you to pull out the toner and drum, but don't pull out the drum/toner.
2. Push the button: Options (located on the left of the control pad).
3. Type: *00 on the keypad.

The Brother MFC 9440N should be reset and the Toner End of Life message should disappear. Warning, this may void your warranty and ultimately damage your machine if you are reusing or refilling your cartridges, but you should already know that. Hope this helps.

Thoughout my experience of fixing computers, I have seen this happen twice. Once was because the "new" ink cartridge was empty (which should cause the LCD display to say "cannot print"). the other was because the end user did not remove the protective yellow cap before installing the ink cartridge (yes, they made it fit). If neither of these are the cause you should try cleaning the print head. You can do so by pressing "ink", then scroll down to "cleaning", then scroll to black and press "ok".

Brother International - Support for your Brother Product

Hello,

You can set the MFC-9440CN to print with the black toner cartridge only through the printer drivers.

If you are using Mac, this needs to be changed before you print or set a preset.

If you are using windows, follow the below steps.

1. Go to Start menu \ Control Panel \ Printers (devices and printers for windows 7)
2. Right click on the MFC-9440CN and select "printing preferences"
3. Under the "basic" tab, you will see "color mode"; simply select "mono"

Thank you,

Hello,

The MFC-9440CN should be able to work even if one or more of the color cartridges are empty.

here's what you can do to print in black only.

1. Unplug the power to the MFC-9440CN
2. Clear the print queue on your computer so that there are no jobs waiting.
3. Right click on the MFC-9440CN printer icon and select "printing preferences"
4. Select "mono" as the color mode.
5. Turn the power back on for the printer.

Now when you print it will be in black only and it should work even if all 3 colored toner's are empty.

Thanks,

Pat

The toner ecology was turned on, turned it off and printed normal again.