Samsung laser black and white all-in-one SCX-4321NS machine screen shows "paper or paper, open/close the door", how to solve?

Example:When copying and printing, the machine screen displays "paper jam or paper, open/close the door ".

 
Original cause: 
1. Paper jam occurs in the paper feed area.

 
2. No paper or paper is properly placed in the paper tray.

 
The solution is as follows:

1. Check whether paper jam occurs in the paper feed area.

 
1. The paper in the paper tray gets stuck when it is halfway through. Open the front door first, and then close the front door to see if the paper exits automatically.

 

 

2. If the paper does not exit, please pull the stuck paper slowly by taking the paper manually.