The message "Replace Toner" is intended to alert you that the toner cartridge has reached the end of its expected life. It is recommended that the toner cartridge be replaced.
To clear the "Replace Toner" message, install a new genuine Brother TN420 or tn450 toner cartridge. When replacing the toner cartridge, you MUST install a brand new, unused genuine Brother toner cartridge in order to reset the "Replace 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.
Refer to the following solution for toner replacement instructions - "How do I install a new toner cartridge? How do I replace the toner cartridge?"
The machine can be placed in Continue Mode. This is a temporary mode that will ensure that the current toner cartridge can continue to be used until the status changes to "Toner Ended" before you install a new toner cartridge.
Refer to the following solution for instructions to enable Continue Mode - "What is Toner Continue Mode?"
Brother strongly recommends that customers use only genuine Brother drum units and/or toner cartridges. Each Brother laser printer is designed to work 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, ink cartridges, or toner.