To solve the problem, please try the followings:

NOTE: Illustrations shown below are from a representative product and operating system, and may differ from your Brother machine and operating system.

• Make sure that the paper in the paper tray is straight. If the paper is curled, straighten it.
  
  
• Reduce the amount of paper in the paper tray.
  
  
• Check if the LCD or LED shows some error. If necessary, refer to "FAQs & Troubleshooting" for information on the error message or the LED light.
  
  
• Check the Paper Source setting of the printer driver. If "Manual" is selected for "First Page", change it to "Auto Select" or "Tray1".
  
  
  
  
  
  
  
• Clean the Pickup Roller and Separation pad following the instructions below:
  
  
  Do NOT use isopropyl alcohol. Do NOT use any type of spray to clean the inside or outside of the machine. Doing this may cause a fire or electrical shock.
  
  
  
  
  1. Turn the power switch off and unplug the machine from the power outlet.
     
     
  2. Remove the paper tray from the machine.
     
     
     
     
     
     When you look inside of the machine where the paper tray has been removed from, you will see the Separation Roller and the Pickup Roller at the front hanging down.
     
     
  3. Check the Pickup Roller.
     
     

     Brother machine with a FB (FlatBed)	Brother machine without a FB

     
     
     
     
     
     
     Below is the view from beneath. There are two Pickup Rollers.
     
     
     
     
     
  4. Check the surface of the rollers.
     
     

     Clean	Dirty

     
     
     
  5. Clean the surface of the rollers with a wet lint-free cloth. Please make sure to tightly wring out a cloth.
     
     
     
     
     
     
  6. Check the Separation pad on the paper tray.
     
     
     
     
     
     
  7. Check the surface of the Separation pad.
     
     

     Clean	Dirty

     
     
     
     
  8. Clean the surface of the Separation pad with a wet lint-free cloth. Please use a hard cloth and scrub the pad.
     
     
     
     
     
  9. Put the paper tray back into the machine.
     
     
  10. Plug the machine's power cord back into the AC power outlet and turn the power switch on.