The Cartridge Error message appears if the toner cartridge is not installed correctly.
Pull out the drum unit, remove the toner cartridge for the color that is indicated on the LCD, and put it back into the drum unit again following the steps below:
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Make sure that the machine is turned on. Press the front cover release button and then open the front cover.
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Hold the blue handle of the drum unit. Pull the drum unit out until it stops.
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Hold the handle of the toner cartridge and gently push it toward the machine to unlock it. Then pull it out of the drum unit.
![Pull Toner Pull Toner](/g/b/img/faqend/faq00002673_011/th/en/1000591/PullToner.gif)
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Hold the handle of the toner cartridge and slide the toner cartridge into the drum unit then gently pull it toward you until you hear it lock into place. Make sure that you match the toner cartridge to the same color label on the drum unit.
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Push the drum unit in until it stops.
![Push Drum Push Drum](/g/b/img/faqend/faq00002673_011/th/en/1000593/PushDrum.gif)
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Close the front cover of the machine.
If the problem continues, call your dealer or Brother customer Service.