Please check the following points to solve the problem:

• Choose Reduce Paper Curl mode in the printer driver when you do not use our recommended paper.
   

  For Windows users:
  NOTE: The steps and screens may differ depending on the operating system and application being used.

   
  1. From the menu bar of an application, click File => Print.
     
     
  2. Check your printer name is chosen and click Properties. 
     
     
  3. Click Advanced tab and then Other Print Options.
     
     
  4. Click Improve Print Output and select Reduce Paper Curl.
     
     
  5. Click OK to close the Other Print Options dialogue.
  6. Click OK to close the Properties dialogue.
  7. Click OK. The document will be printed.
   

  For Macintosh users:
  NOTE: The steps and screens may differ depending on the operating system being used.

   
  1. Choose "Print" from the File menu and open the Print dialogue.
  2. Choose "Print Settings" from the print options pop-up menu.
  3. Click Advanced and then Improve Print Output....  
     
     
  4. Select Reduce Paper Curl.
     
     
  5. Click OK.
  6. Click Print.
  
  
  
• Turn the paper over in the paper tray, and print again. (Excluding letterhead paper)
  If the problems remains, switch the Anti-Curl Levers as follows:
   
  1. Open the back cover.
     
  2. Lift the lever (1) and slide the two gray levers (2) in the direction of the arrow.
     
     
  3. Close the back cover and try to print again.