Check the solution applicable for your case.

Case 1: The front cover is not completely closed.
Close the front cover of the machine.

Case 2: The Control panel cover is not completely closed.
Make sure that the Control panel cover of your machine is completely closed.

Case 3: The Control panel cover was open when you loaded a document.
Close the Control panel cover of the machine, then press Stop/Exit.

Case 4: The fuser cover is not completely closed or paper was jammed in the back of the machine when you turned on the power.

• Close the fuser cover of the machine.
  
  
• Make sure paper is not jammed inside the back of the machine, and then close the fuser cover and press Start.