I just replaced the toner cartridge and the LCD continues to display the message "Toner Life End" or "Replace Toner".

Replace Drum

Replace WT Box

Replace Toner

What is the difference between the toner cartridge and the drum unit?

Replace Fuser

Replace Laser

Replace PF Kit xx

I still receive the error message "Replace Drum", "Drum End Soon", or "Drum Stop" after I replace the drum unit with a new one.

Replace Belt

I print mainly black and white documents. How can I stop the life of my color toner cartridges from decreasing when I print?