The toner cartridge or the drum unit and toner cartridge assembly is not installed correctly.
Remove the toner cartridge and drum unit assembly, remove the toner cartridge from the drum unit, and reinstall the toner cartridge back into the drum unit. Reinstall the toner cartridge and drum unit assembly back in the machine following the steps below:
- Make sure that the machine is turned on.
- Open the top cover until it locks in the open position.
![Open top cover](/g/b/img/faqend/faq00002658_007/hk/en/36300/a3170_u_g017.gif)
- Remove the toner cartridge and drum unit assembly for the color shown on the LCD.
![Take out toner and drum](/g/b/img/faqend/faq00002658_007/hk/en/36301/a3170_u_g018.gif)
- Push down the green lock lever and take the toner cartridge out of the drum unit.
![Take out toner from drum](/g/b/img/faqend/faq00002658_007/hk/en/36330/a3170_u_g043.gif)
- Put the toner cartridge firmly into the drum unit until you hear it lock into place. If you put it inproperly, the green lock lever on the drum unit will lift automatically.
![Put in toner in drum](/g/b/img/faqend/faq00002658_007/hk/en/36302/a3170_u_g046.gif)
- Slide the toner cartridge and drum unit assembly into the machine. Make sure that you match the toner cartridge color to the same color label on the machine.
![Put in toner and drum](/g/b/img/faqend/faq00002658_007/hk/en/36303/a3170_u_g019.gif)
![Toner color match](/g/b/img/faqend/faq00002658_007/hk/en/36304/a3170_u_g0191.gif)
-
Close the top cover of the machine.