Random Marks and Dots on Printed Page

Issue description

When printing a document, random dots and marks appear on the page.

Possible cause

This print quality issue is caused by excess developed toner on the printer.

Solution

1. Make sure that the latest firmware (FW) is installed.



2. Perform a power-on-reset (POR) by powering the printer off and power it back on.



3. Open the printer front door and remove the supplies.



4. Remove the toner cartridge from the imaging unit to separate the two supplies.

   


5. Insert the toner cartridge back to the imaging unit, install back the supplies to the printer and close the front door.



6. Perform a test print and check if the PQ issue still appears.

   • If the issue appears, proceed to the next step.


7. Access the Diagnostics menu from the home screen by pressing Back, Right arrow, Back, and Right arrow on the control panel.



8. Navigate to Printer setup > EP setup > Charge adjust and set it to 'High'.



9. Should the issue persist, replace the Imaging Unit with Part number: B220Z00.