Question about Brother MFC 7420 All-In-One Laser Printer

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How do I change the toner on a Brother model mfc7240 Tks.

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Here is the BROTHER support page for your model 7420 printer.   You may download a manual for free and I am sure the directions are contained within.  

http://welcome.solutions.brother.com/BSC/public/eu/gb/en/model_top/monolasermfc/mfc7420_all.html?reg=eu&c=gb〈=en∏=mfc7420_all

Posted on Jan 28, 2009

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KUWIT OIL COMPANY IAM FACING PROBLEM IN FAX MACHINE BROTHER 2820 MESSAGE SHOWS 'TONER LIFE END' AFTER CHANGING TONER MESSAGE REMAIN SAME PLEASE GIVE ME SOLUTION. I HAVE AROUND 24 FAX MACHINES BROTHER...


you must have remove the white mylar sheet from the catridge when loading it...if yes! you got to find back the white mylar (plastic sheet) that slot in between the drum and charger roller placed it back ( the position must be accurate) then slot in back the catridge.The white mylar sheet is to reset the drum life counter

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I have a Brother fax and copy machine and have just replaced toner with a brother TN 350 cartridge and still getting message that toner is low


You didn't include the model, but here are instructions for the Fax-2820; it should work for any of the models that use the TN-350 toner:
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  2. Press the Options key. The display will read "Change Drum?"
  3. Press Start.
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Normally, inserting a new cartridge (with the power on) will reset the toner counter, and you won't have to do any of this.

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Have the same problem, can't find the solution. Filed a complaint on the brother website feedback link, hopefully they will resolve if more people post problems with toner cartridge changes

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Go to the Brother web site and download the user guide. You'll find all the info you need there.

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A new laser could help, but you should make sure the toner save is turned off, it makes toner last longer by making light prints. Toner save is set in printer properties in the control panel

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If this model comes with the drum separately of the cartridge, only replace the cartridge. There's no need to change it every time. until prints start to get lines or dots. Don't expose the drum to light too much.

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Sounds like the toner cartridge is faulty. I would change the cartridge.

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