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Light Vertical Lines when Printing from the Lexmark CS310, CS410, CS510, CX310, CX410, and CX510

Document ID:SO7193

Usergroup :External


Print Quality; Vertical Line; Light Band; Streaks; Lines; Fading; Missing; Black; Magenta; Yellow; Colors;



Toner cartridges may develop a noticeable light vertical line(s) through areas of solid color on the printed pages due to contamination on the printer printhead lens. The faded lines usually occur in only one color, but may also appear across multiple colors. See image below to see an example of this print quality issue.



Print Defect Sample

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This article will help you confirm the problem. Please refer to the directions in the table below to help determine which hardware part is causing the issue.




Steps Actions

For a print quality defect of this type, it is always advisable to print the following;

  • Print Defects Guide – These guides will allow you to determine the cause of the repeating defect based on the distance between the original and the residual image(s), as well as other print defect issues. 
  • Menu Settings Page – To check the levels of the consumable supplies (i.e., items such as toner cartridges and photoconductor units); supplies at or near the end of their functional lives can cause various print quality issues independently of printer operation.

Note: The User's Guide provides detailed instructions for navigating through the printer menus.


Using the Menu Settings page, check the levels of the consumable supplies. If any of your other supplies are low, replace them to see whether this resolves the issue. Many print quality issues are caused simply by a supply item at or near the end of its expected functional yield. Resend the job to the printer.
Did the issue return?

Yes: Continue to Step 3.
No: If the page prints, the printer is functioning correctly.

Note: Instructions for replacing supplies can also be found in the User's Guide.

3 If the supply levels are adequate, it possible that the printhead lens has become dirty and needs to be cleaned. Follow the steps below for Cleaning the Printhead Lens.

Note: If the issue persists thereafter, proceed with the steps below.


To determine the source of the print defect, refer to the Print Defects Guide.

  • If the vertical lines occur only in one color, please replace the affected developer unit and order the photoconductor unit (PCU).
  • If the issue may appear to occur across multiple colors, please replace the Imaging Kit.
5 If issue persists after performing the steps mentioned above, there may be an issue within the machine's hardware. Please contact Lexmark Technical Support for other troubleshooting suggestions.



Cleaning the printhead lens

Steps Actions Image

Power off the printer/MFP.

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Open the front cover.

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Open the toner access door.

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 Remove the right-hand side cover.

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5 Remove the waste toner bottle.
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6 Remove the toner cartridges.
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7 Lift the blue levers on the imaging kit, and then pull the imaging kit until it stops.
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8 Press down the blue lever, and then grasp the green handles on the sides to pull out the imaging kit.
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9 Use a lens cleaning cloth to wipe the four printhead lens.

Note: Be careful not to scratch the lens or damage the belt below the printhead.

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Reinstall the imaging unit, waste toner bottle and right cover. Close the toner access door and the front cover. Power on the printer/MFP again and print a test page.

Note: If the error persists, continue to Contacting Lexmark below.

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Contacting Lexmark

Please contact Lexmark Technical Support if you need additional assistance. NOTE: When calling for support, you will be asked for your machine/model type and serial number (SN). If you need help locating your printer's model type and serial number, click here.

Please call from near the printer in case the technician on the phone asks you to perform a task involving the printer.




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