Problem: No network connection
答：
◆ Check that the terminal IP address is correct
◆ Check that the computer's IP address is in the same network segment as the terminal IP
◆ Directly connect the computer network port to the machine port, and at the command prompt ping the IP address of the terminal to see whether network traffic is normal
◆ Check whether the network port chip crystal (Y2) is oscillating at the standard 25MHz
◆ Check the peripheral circuits of the network port, and if there is no problem, then replace network port chip U10.
