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"JAM DUPLEX" error appears on the LCD. What should I do?

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

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

I don't think I got the full yield from my high-yield toner cartridge but the message "Toner Life End" or "Replace Toner" is displayed on the machine or the LED is on or flashing.

"JAM REAR" error appears on the LCD. What should I do?

"JAM INSIDE" error appears on the LCD. What should I do?

"JAM TRAY 1", "JAM TRAY2" , "JAM TRAY3" error message appears on the LCD. What should I do?

"JAM MP TRAY" error appears on the LCD. What should I do?