I just replaced the toner cartridge and the LCD continues to display the message "Toner Low" / "Replace Toner" / "Toner Ended" or the Toner LED is still on or flashing.

Toner Low or Prepare New Toner Cartridge

(Video) Replace Toner

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

Scan Unable xx

Print Unable or Print Unable XX

Self-Diagnostic

2-sided Disable or 2-sided Disabled

TONER ENDED

Size Error DX or Size Error 2-sided

Manual Feed

Size mismatch

Drum !

Drum End Soon

Jam 2-sided

Jam Rear (With Video Instructions)

Jam Inside (With Video Instructions)

Jam Tray (With Video Instructions)

Replace Drum