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The counter reset method depends on the cause of the toner life end message and the condition of the newly installed cartridge.
When a USED toner is installed the reset gear is set to IN USE.
When a NEW toner is installed the reset gear is set to FACTORY SET.
I found the following post on another site. It appears to work.
If you want to reset your Brother MFC 7820N 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 7820N 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.
You could try resetting the toner cartridge settings. OPen the machines front door where you would replace the cartridges. On the top panel you will see a "clear/back" button. Press it and on the display you will see a reset menu come up. Arrow to each one and hit the OK button. Press "1" to reset. Once you have gone through all close the front door of the machine and press stop to bring the display back to normal.
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 is a gear on the left hand side of the toner to reset the toner count this can cheated be rewinding it. Yes the design is to stop the refillers or at least slow them down a bit. If this fails purchase a new genuine toner but I have seen problems with the switch that resets the toner (Either the spring on the switch has popped off or the main board has failed).