Please check the following points to solve the issue:

• Make sure that you use paper that meets our specifications. A rough surfaced paper or thick print media can cause issues.
  Please refer to FAQs, "What kind of paper can I use?" and "What is the recommended paper?".
   
• Make sure that you select the correct media type in the printer driver.
   
• Make sure that a torn piece of paper is not stuck inside the machine blocking the scanner.
   
• The issue may disappear by itself. Print multiple pages to clear this issue, especially if the machine has not been used for a long time.
   
• The drum unit may be damaged. Put in a new drum unit.
  Please refer to the instructions, "REPLACE DRUM".