How can we repair the failure of the electric welding machine

First of all, let's take a look at the first problem of the electrothermal fusion welding machine. When the power is connected, there is no power. Why is there no power? That is, the fuse is burnt or the power interface is damaged. How can we deal with this problem? We need to replace parts or connect power from the beginning.
The second problem is that the display screen does not appear, the screen is blurred, and the machine buzzes after power on. It may be that the display screen is damaged. The causes of the display screen damage are exposure, heating, impact, aging, and wire loss. The problem is that we can connect from the beginning and replace the display screen.
The third electric fusion welding machine is unable to increase the current because the external power supply is under voltage and the power line is laid too long. You need to check the external power supply and lay it from the beginning.
The fourth reason is that the current parameters of the first section are set too low when the power supply is turned on. The method is to increase the current parameters of the first section for less than 30s, and then continue welding with normal parameters
The fifth is that the welding is abnormal. Because the heating element of PB pipe is short circuited, we can stop welding, such as welding after cooling
The sixth is to show that the output is open circuit, the resistance value exceeds the lower limit, and the PE pipe fittings are abnormal. Check the P8 pipe fittings and replace the pipe fittings from scratch for welding
Seventh, the welding process is abnormal and the connecting column is hot; The copper cap of the output wire is aging, and the copper cap shall be corrected or the new accessory shall be replaced from the beginning.
The eighth is to show that the cause of over-current and over-voltage is the problem of external power supply. You need to check the external power supply and connect from the beginning.
The ninth is that the motor works but the hydraulic pushing is invalid because the hydraulic oil is not in the nominal position, so the hydraulic oil can be checked and supplemented with regular hydraulic oil