Question about Brother MFC-9840CDW Laser Printer

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Grays are printing blue green

I just replaced the three (C,M,Y) color toners and the drum in my Brother MFC-9840CDW printer. Reset the drum counter, re-calibrated the colors, did an auto and manual registration BUT my grays are printing as a pale blue or green. When I run a test print or print reports straight from the printer, the grays look fine. But when I print a document, the color is just off. I can't seem to figure out how to fix it. Is it the toners? Or the machine? Can it be fixed?

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  • MsWCBE Feb 17, 2012

    I have cleaned it inside and out as best as I could and problem still remains.

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Maybe you should clean it :)

Posted on Feb 17, 2012

  • MsWCBE Feb 17, 2012

    I have cleaned it inside and out as best as I could and problem still remains. Thanks though! Any other ideas?

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Reset the drum counter on Brother MFC-8950DW


To reset the drum counter on a BROTHER MFC-8950DW open the front cover, press the start '*' button on the keypad, the screen will show the reset menu, click drum, click yes, and you will get a message on screen accepted. The procedure listed in the brother manual for this machine is wrong and does not work.

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How do I reset the counter for the drum unit on a Brother MFC 9840-CDW. It says to replace the drum but the unit is printing flawlessly.


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.
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How do you turn off the drum alert after installing a new drum on the MFC-9840CDW Brother Laser printer?


Hi,I think this guys can have more helpful information about your problem.See this link:http://www.quikshiptoner.com/catalog/brother-mfc-9840cdw-toner-color-set.html#resett_drum_manualview More Info button to see how to install the Drum unit. Pay attentionthat after replacing a Drum unit in Brother MFC-9840CDW you have to reset thecounter. See steps 9, 10 and 11 for doing so.9) Close thefront cover, plug the power cable back in and turn on the printer.10) Press the Menu button,and then enter the number 84 to access the Reset Menu.11) Press the scroll keys until Drum is displayed and press OK.
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1 Answer

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