Answer to your Frequently Asked Question:

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Description of Problem 100000023548

Why does the Toner LED stay on after I replaced the toner cartridge?

Description of Solution 200000030038

1.    Verify you installed a new, unused, genuine Brother toner cartridge (TN420 or TN450) from a sealed foil bag that had never been installed in this or any other machine.


When replacing the toner cartridge, you MUST install a brand new, unused toner cartridge (TN420 or TN450) in order to reset the toner status.  Do NOT install a previously used cartridge that was already installed into another machine or a TN starter cartridge that comes with the machine.


Our toner cartridges are manufactured with a reset lever that moves when installed into the machine.  The movement of the lever mechanically triggers the machine to reset the toner status.  If a used cartridge or a TN starter cartridge is installed into a machine, it will NOT trigger the machine to reset the toner status.


2.    Verify you are using genuine Brother toner.


Brother strongly recommends that customers use only genuine Brother drum units and/or toner cartridges.  Each Brother laser printer is designed to operate at pre-set temperatures that are matched exactly to each of our individual toner formulations.  Each individual component is designed to work with the other to ensure quality and reliability.  Using non-Brother supplies may affect the hardware performance, print quality and machine reliability.  The Brother limited warranty does not apply to any problem that is caused by the use of third-party drum units, toner cartridges, or toner.


3.    Verify the drum unit and toner cartridge are installed correctly by performing the following steps:


a.    Open the front cover and remove the drum and toner assembly.  Be sure to place the drum and toner assembly on a piece of paper in case of spilled or scattered toner.



b.    Remove the toner cartridge from the drum by holding down the green lock lever on the left side of the drum unit and lifting the toner out.  Handle the toner cartridge carefully.



NOTE: If toner scatters on hands or clothing, immediately wipe it off or wash it with cold water.


c.    Reinstall the toner into the drum.  Be sure it clicks into place.  If you put it in properly, the green lock lever will lift automatically.



d.    Reinstall the toner and drum assembly into the machine and close the front cover.



4.    If the issue continues and you installed a new, unused genuine Brother toner cartridge (TN420 or TN450) from a sealed foil bag, verify the machine has the most recent firmware version by downloading and running the Brother Firmware Update Tool.  Refer to solution How do I perform a firmware update or firmware upgrade on my Brother machine?


If you have the most recent firmware version and the issue continues, contact Brother Customer Service by calling 1-877-Brother (1-877-276-8437) Monday through Friday, excluding holidays.

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