What if the user information transmission equipment keeps ringing?

The user information transmission equipment keeps ringing, which is a fault alarm. The solution is as follows:

1, check whether the power supply is normal, and check whether the cable connection of the display panel is normal.

2. Check the AC wire to ensure good connection. Check whether the AC fuse is blown. If it burns out, please replace it.

3. Check whether the connection between the standby line and the power board is normal. Check whether the battery is short of power or damaged. Turn on the battery under AC power supply for more than 8 hours. If the fault cannot be eliminated, please replace the battery.

4, check whether the host power feedback cable is connected well. Check the failure of the main power supply, and the standby power supply works under undervoltage.

5. Check whether the port wiring is normal.

6. Check whether the SIM card is inserted and whether the SIM card is in arrears. , and keep the SIM card normal.