Question about Brother MFC-9840CDW Laser Printer

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We do very little colour printing on our MFC-9840 CDW machine but are having to change all the toner cartridges every two monthes. I also fail to see how they would all be empty at the same time. At the high cost of the toners it makes the machine extreamly expensive to run. Is there a way to get more life from them. I also purchased four new cartridges to replace but they did not work either. Please advise me what to do! Thanks!

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Are you purchasing actual Brother Replacement Toners or off name brand ones? I have seen Non-Brother toners cause all kinds of issues. If they are brother, put some tape or a sticky over the clear eye on the side, you will get a few hundred more pages out of them. If you know for a fact there is still toner in them, and they are brother toners, just do this to reset the counters on them.

  1. Turn off the Printer
  2. Press and hold the menu button and turn on. Keep holding button until you see maintenance on the display
  3. Press 88. this brings up parts replacement menu.
  4. Press up arrow until you see the part you replaced or want to reset.
  5. Press the OK button
  6. Power off and restart Printer.

Posted on Sep 06, 2010

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1 Answer

What is no waste toner on mfc-9840cdw


The 9840 uses a WT100CL cartridge for collection of Waste Toner.

If you remove the Drum Unit then the Plastic Sheet (Transfer Belt) like thing the Waste Toner sits underneath this. Lift out the waste toner and replace it or put one in if it is missing.

Put the Transfer Belt and Drum Unit back in. Close the machine and away it goes again.

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This is caused mainly by leaving the Corona Wire sliders anywhere other than where the arrows on the slider meets the arrows on the Drum Units. This leaves solid lines of colour down the length of the page (one per colour with the slider in the wrong place) if it is leaving more than the single line on the page it is probably leaking cartridges.

These particular cartridges are known for their ability to leak badly (OEM and Remanufactured cartridges do it). The only option for a leaking cartridge is to replace it and clean out the machine with a lint free cloth preferably a 'Toner Grabber' cloth. If you nee one of the toner grabber cloths then talk to your local cartridge refilling place for one. If they refil toner cartridges there then they probably have them or can suggest a different option.

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Need installation driver disc for a brother mfc 9840 cdw copier


You can download the Brother printer drivers from their support WEB site. Please click on this link and select your model printer to download : - http://www.brother.com.au/ProductsSolutions.aspx

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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.
In any case, Google 'Brother drum flag gear' for more information.
Good luck!

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That's usually a bad toner cartridge that dumps too much toner per print. Buying a new toner cartridge should fix it. You may need to wipe up a little spilled toner inside. Just use a dry cloth, and be very careful around the little black levers that stick up to detect the paper.

There are other manufacturers who sell toner for these, but some of them have toner inside that's so hard to stir, it breaks the gear in the machine. That makes a very expensive repair for the little money you save on generic toner.

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Viewing total installed memory


Print a User Settings Report:

Menu
6
5
Press Mono Start or Colour Start
Press Stop/Exit

Cheers

Dirk

Aug 16, 2008 | Brother MFC-9840CDW Laser Printer

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