There are many factors that determine the actual drum life, such as the temperature, humidity, type of paper, type of toner used, number of pages per print job and so on. Under ideal conditions, the average drum life is estimated at approximately 12,000 pages. The actual number of pages that your drum will print may be significantly less than this estimate. Because we have no control over the many factors that determine the actual drum life, we cannot guarantee a minimum number of pages that will be printed by your drum.
For best performance, use only genuine Brother toner. The printer should be used only in a clean, dust-free environment with adequate ventilation.
Printing with a third-party drum unit may reduce not only the print quality but also the quality and life of the printer itself. Warranty coverage does not apply to problems caused by the use of a third-party drum unit.
While removing the drum unit, handle it carefully because it may contain toner.
Every time you replace the drum unit, clean the inside of the printer. See Cleaning.
Make sure that the printer is turned on and the Drum LED is blinking. Open the front cover.
Press and hold down the white Go button for about 4 seconds until all the LEDs light up. Once all four LEDs are lit, release the Go button.
Take out the drum unit and toner cartridge assembly.
Push down the green lock lever and take the toner cartridge out of the drum unit.
Unpack the new drum unit.
Put the toner cartridge firmly into the new drum unit until you hear it lock into place. If you put the cartridge in properly, the green lock lever will lift automatically.
Put the drum unit and toner cartridge assembly back in the printer.
Close the front cover.
Make sure that the Drum LED is now off.