![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Make sure that the latest firmware (FW) is installed.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Perform a power-on-reset (POR) by powering the printer off and power it back on.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Open the printer front door and remove the supplies.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Remove the toner cartridge from the imaging unit to separate the two supplies.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Insert the toner cartridge back to the imaging unit, install back the supplies to the printer and close the front door.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Perform a test print and check if the PQ issue still appears.
- If the issue appears, proceed to the next step.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Access the Diagnostics menu from the home screen by pressing Back, Right arrow, Back, and Right arrow on the control panel.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Navigate to Printer setup > EP setup > Charge adjust and set it to 'High'.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Should the issue persist, replace the Imaging Unit with Part number: B220Z00.