1. First, check whether there is anything wrong with the cash register. See if the indicator light is on. If the red and blue lights are flashing, it proves to be a problem with the ticket machine. Generally, the printing paper is not properly placed or the printer cover is not tightly covered.

2, the connection line problem. Plug in the cable between the printer and the host computer, and then refresh the computer.

3. There is something wrong with the usb port of the computer (it is best to use the usb port behind the desktop). Personal experience shows that there are many problems with the front socket.