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Use the on-line authentication tool to verify whether you have a Genuine Lexmark cartridge.
Please contact your point of purchase for a possible refund or to demand a genuine replacement cartridge.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Increase toner darkness.
- To do this from the control panel:
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
From the home screen, Click the menu button (C79x/X79x and MS/MX81x) then navigate to: Settings > Print Settings > Quality Menu > Toner Darkness.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Adjust to desired setting, and then touch Submit.
- To do this from the Embedded Web Server (EWS):
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Open a web browser and enter the printer's IP address.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Click Settings > Print Settings > Quality Menu.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Adjust the toner darkness to a darker setting, and click Submit.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Lower the print resolution to 600 dpi if it is currently set to 1200 dpi (1200 dots per inch) can cause fine fill-lines to not appear or to appear faint and not clear or crisp.
- To do this from the control panel:
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
From the home screen, Click the menu button (C79x/X79x and MS/MX81x) then navigate to: Settings > Print Settings > Quality Menu > Print Resolution.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Adjust to desired setting, and then touch Submit.
- To do this from the Embedded Web Server (EWS):
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Open a web browser and enter the printer's IP address into the address field.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Click Settings > Print Settings > Quality Menu.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Set print resolution to 600 dpi, and click Submit.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Darkness variation caused by installing new supplies.
- If you have a new Imaging Unit, uninstall the cartridge and imaging unit.
- Inspect it to ensure all packaging material has been removed.
- Make sure the red strap/plugs are fully removed before reinstalling the supplies into the printer.
Note: For more information, see “Replacing supplies” section of the printer's User’s Guide.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Darkness variation caused by external conditions. It may occur due to environmental conditions. This can be witnessed by fading from left-to-right in hot or cold conditions.