Lexmark MX931
The printed or copied images show dark streaks following the paper feeding direction.
Replace the imaging unit.
To order the imaging unit, follow these steps:
Go to lexmark.com.
Click Supplies & Accessories. In the dropdown menu, click Find Supplies.
In the search bar, type the printer model or supplies part number. Click Find my supplies.
In the product page, scroll down and look for the Supplies tab.
Choose the product to order and Add to Cart.
Checking the toner and the imaging unit may help solve the issue of seeing vertical dark lines or streaks on your prints.
Prevent vertical dark streaks with missing images on your prints by checking the imaging unit and toner cartridge.