Common Faults of Inverter-3
2>. When the keyboard display is normal but cannot be operated, we can take the following detailed steps to troubleshoot and repair the fault:
1. If the keyboard display is normal, but the function keys cannot be operated, you should check whether the keyboard used matches the main control board (whether it contains IC75179). For the machine with internal and external keyboard operation, you should check the Whether the position of the DIP switch is correct.
2. If the display is normal, but some buttons cannot be operated, check whether the button micro switch is defective.
3. The potentiometer cannot adjust the speed:
1. First check whether the control mode is correct.
2. Check whether the given signal selection and analog input mode parameter setting are valid.
3. Whether the setting of the DIP switch on the main control board is correct.
4. If all the above are correct, it may be that the potentiometer is bad, and you should check whether the resistance value is normal.
In actual operation, it is recommended to check in order from easy to difficult and from external to internal to improve the efficiency of troubleshooting.
