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Lexmark MC2640

Lexmark MC2640

Print Quality Defect - Vertical Dark Streaks on the Printed Document

Affected products

Click Properties in the title section above.

Issue description

When a user prints a document, they notice an irregular dark/black, vertical streak or line (also known as powder defect) on certain parts of a printed page.

The following are also noticed whenever this issue occurs:

  • PQ defect can usually start from the top of the page and stop anywhere on the page.
  • PQ Defect is always in the vertical orientation, however the length and starting positions vary significantly.

Sample printouts



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

  • Menu Settings Page – To check the levels of the consumable supplies (i.e., items such as imaging units, developer units and photoconductor units), because supplies that are low or near the end of their functional lives can cause various print quality issues independently of printer operation.

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

2Check which color is affected by the print quality issue. Remove that imaging unit and check the developer unit for any toner accumulation.
3Remove the developer unit from the imaging unit and shake each unit gently from side to side while holding them in a horizontal position.
4Place the developer units back on the Imaging unit. Reinstall the Imaging unit.
5Run color adjust: Print > Quality > Advanced Imaging > Color Adjust > Start, and print a test page.

Still need help?

If you need additional assistance, please go to the Lexmark support site, type your printer model and locate

Get in Touch with Lexmark! for contact information.
When calling for support, you will need the following:

  • Printer model
  • Printer serial number
  • Toner/imaging unit/waste toner bottle part number and serial number (for supply-related issues)

Please be near the product/s described in this article to expedite the support process and reduce callbacks.


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