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If you have new toner, did you shake it about 10 times back and forth to evenly distribute the toner inside? Also take out the toner and re-insert and try again. It is possible your drum needs to be cleaned too or replaced if near end of life drum count.
Unfortunalely printers and there drivers estimate toner life buy counting the amount of dots draws on the pages. Say a cartridge is rated for 3000000 dots when new, the printer will know after printing 1500000 dots that the cartridge is about half full. If you replace a cartridge the printer will assume it's new as the ID tag will be different from the last cartridge. There really isn't any way of modifying or specifying the age of a cartridge. You will just have to keep using it until you start seeing drop outs on the page, then you will know it is almost empty. Shaking it a few times will usualy help stretch the life of a cartridge.
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.
If your cartridge has a lever on the left side near the rear, it needs to be reset, and there's a lever inside on the left that can stick and cause that error. You need to wiggle and pull that lever until it moves freely again.
After I figured this out, it was quite easy to resolve. Remove the toner cartridge from the drum cartridge. Remove the black plastic cover on the left side of the toner cartridge (3 Phillips screws). There is a "flag", which is a small plastic tab on the outer side set to the right at about 2 o'clock. Turn the gears until you fully reset the tab going counterclockwise to the 10 o'clock position (fully to the left). Reinstall the small black cover and the three phillips screws. And the idea to install black electrical tape over the small clear plastic windows on both sides is also a good idea to prevent the early and false message that the cartridge is empty. Make sure you do not allow that tape to get into the gears.
To reset the sensor after installing a new toner cartridge follow these steps.
1. With unit powered on open the front cover.
2. Press the "Options" key. Display will show "Replace Drum?"
3. Press "Start" key.
4. Press "+" key 10 times until the display reads 10.
5. Press "SET" key.
6. Display will show "Accepted" for approximately 2 seconds. Then display will change to "Cover Open".
7. Close cover and see if Toner Life End error message has gone.
You need to replace the magenta drum. Just because there is life left; it's possible it is scratched. Also, take a cotton ball dip in alcohol and wipe the LED's off when the cover is open; those black things that are hanging down from the cover. Also, make sure your drums are installed in the proper spots (magenta in magenta slot). If the toner "rubs off" after it prints... then the fuser is defective.
Turn of the printer and remove each color toner cartridge and shake it good before putting it back in place, Turn it back on and then it should work. Also you might need to reset your toner cartridges. I found that information at UNI-KIT (toner refill people, reset the counter (Reset Gear)). I just refilled one and found out the hard way that there was a lot of toner left in the cartridge. Also I found that by turning the power on and off that will make it print for a while.
When the Toner Life End LED flips on, requires you to replace the cartridge,
even when there's still toner left in the cartridge. The machine
detects end of life by shining a light through from one side to the
other. To circumvent the detection mechanism, remove the cartridge and put
a piece of masking tape over or jam a little bit of paper into the clear opening/circle on the right side
of the toner cartridge, and then pop the cartridge back in. Eventually,
you'll start seeing streaks, and then you'll know that the cartridge is
There are many problems like that and its not recommended to change toner from one printer to another. but you should try: put the old toner (emty) in again, then turn off the printer, change toner and turn on printer again. if thats not helping, then maybe you have a old FW so you can try to update the firmware.