1. Ensure that the 'Drum' LED is blinking on the front of the Brother HL-5240. This indicates that it is time to replace the drum cartridge on the printer.
2. Open the front cover of the device. This reveals the drum cartridge so that it can be replaced.
3. Hold down the green 'Go' button for four seconds until all the LEDs are lit. Release the button to reset the toner count.
4. Replace the drum cartridge to ensure the accuracy of the count and to provide optimal print quality for your documents.
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