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MFC-7840w keeps saying "toner life end"
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.
on Jan 02, 2018
Problem with our Brother mfc-7840w toner all over the page
since i finally figured this out I thought I would post this for anyone who has the
HL-4040 CN printer - or one similar
After seeing the hitting the buttons with the door open tricks for different models I tried anything that sounded like it had the same buttons my 4040 has... nothing on here worked so I just started hitting combinations of buttons with the door open - wow there are quite a few hidden menus there
For the toner life reset menu:
1 Open the front cover of the printer
2 press and hold the cancel button
3 press the reprint button while still holding cancel
- here is the reset menu - go to the appropriate cartridge on
- the menu and reset it and you're done!
FYI... Pressing the "Go" button and the up arrow gives you the parts life reset menu (drum, laser, fuser, etc.)
I also did the electric tape over the windows - which worked before the reset - but I thought this fact would be helpful too.
For anyone that is asking "what window?" I think it is the clear plastic opening on the sides of the cartridges where you can actually see the powder inside the cartridge - the color of the toner (magenta, yellow, or cyan). I didnt really know that for sure when I tried, but it made sense, and it worked. So I am fairly sure that is the "window" you should be trying to cover.
you can go here for more update: https://www.microtonersupplies.com.au/toner/brother-toner-catridges
on Jul 20, 2017
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