Brother MFC 9880 the toner cartgidge ist not yet empty, there is still 30% toner the message is :replace toner if I do the drum reset, It is still the same message a new toner cartridge works without error message : replace toner what can I do that I have not to waste the 30% toner?

The message 'No Waste toner box' indicates the belt unit is not installed properly. To verify the belt unit is installed properly, follow the steps on this link:

https://help.brother-usa.com/app/answers/detail/a_id/76056/~/how-do-i-clear-the-message-no-waste-toner%3F

If the problem continues, the printer may need service. The printer has a one year limited on-site warranty. If the printer is in warranty, call Brother Customer Service at 1-877-Brother (1-877-276-8437) for warranty options.



If the printer is out of warranty, contact a Brother Authorized Service Center for repair by clicking on the link below:

http://www.brother-usa.com/service/default.aspx

Open the front cover Press clear 1 Press drum was reset

Hi there,

Below are instructions that I have found from the internet. Hope that they will help.

• Open the front cover of the printer.
• Hold down the Go button for 4 seconds until all the LEDs light up. Then release the Go button
• Remove the drum unit and toner cartridge assembly.
• Replace the drum unit and toner cartridge assembly back into the printer.
• Close the front cover of the printer
• Your drum unit should now be reset
MFC / DCP PRINTER SERIES

1.Remove the drum unit and toner cartridge. Wait 1 or 2 minutes.
2.Replace the drum unit and toner cartridge into printer.
3.The error message "Change Drum Soon/Drum end soon" will continue to appear if the drum counter was not reset when you replace the drum unit.
4.To clear this error message, you need to reset the drum counter as instructed below.
5.Make sure that the machine is turned on.

For MFC users: To confirm you are installing a new drum, press 1. For DCP users To confirm you are installing a new drum, press the Up Arrow key

7.When the LCD shows Accepted, close the front cover.
8.Your drum is now reset.

Resetting the drum unit will not improve print quality. It only resets your drum and allows you to continue to print. You decide when to replace the drum unit not the manufacturer!

On the TN-155 toner cartridge, a mechanical 'flag gear' that will reset the counter for each individual cartridge when first 'triggered'.
After each page print, the appropriate counters are incremented regardless of toner content (that is why it is still printing 'flawlessly') and after a pre-determined count has been reached, you will get a warning to change the drum as is will then be notionally (not actually) empty.
Before you decide to reset the 'flag gear' on the drum, make sure you are not actually nearing the physical empty state ... it might be a wiser decision to purchase a refill kit which should come with instruction on how to fill and reset the 'flag gear' (this needs some dismantling of the drum cartridge) or buy a compatible or genuine toner drum cartridge.
In any case, Google 'Brother drum flag gear' for more information.
Good luck!

Same with our Brother 8640N, drum near end means toner is nearly to end but sometimes even you replace bew cartridge is appears this message. TONER LIFE END message need to replace cartridge.

Brother International - Support for your Brother Product

OK
Here's what you do if the drum counter was not reset when you replaced the drum. To reset the drum counter, follow the instructions listed below.

1. Open the front cover.
2. Press the Options key on the control panel.
   The display will show "REPLACE DRUM - 1.YES 2.NO".
3. Press 1 to reset the drum count.
4. Close the front cover.

When you replace the drum open the front door of the machine where thr drum and toner is.
Hit the clear/back button. Press 1
That resets the drum count after you replaced the unit.

open front cover, press OPTION button, on the LCD will appear a message "NEW DRUM?" ....DO NOT RESPOND....just type on the keyboard "*00" and there will appear a message "Accepted" and use it in your pleasure.

PS. in any case i blocked with paper labels the viewing windows from transparent plastic on the toner itself....

Mr. Brother, do not try to be smarter than your customer

Open front cover

Remove drum unit and toner cartridge assembly

Put drum unit and toner cartridge assembly back in machine, but do no close front cover.

Press Clear/Back
You will get a message "Replace Drum?"
Select Yes to confirm