Please check the following points:

• Check the paper type and quality. High temperatures and high humidity will cause paper to curl.
  To see what kind of paper  you can use, click here.
  
  
  
• Make sure that the media type setting in the driver matches the type of paper you are using.
  To see what kind of media type  you can use, click here.
  
  
• If you do not use the printer often, the paper may have been in the paper tray too long. Turn over the stack of paper in the paper tray. Also, fan the paper stack and then rotate the paper 180° in the paper tray.
  
  
• Try to follow these steps:
  
  
  1. Open the back cover.
  2. Push the gray lever to the right as shown below.
     
     
     
  3. Close the back cover and re-send the print job.