1. Whether there is an error message on the touch screen, if there is an error, please follow the prompts to deal with it accordingly.

2. Check whether the touch screen is connected to the PLC.

3. Press the "Working Method" button to enter the "Working Method" page to see if the test is inactive. If so, press the Quiz button to cancel the situation.

4. If the printing machine can only complete one cycle, please check whether the cartoning machine is turned on. If opened, it will damage the KM5 touch sensor in the boxed electrical cabinet.

5. Use a multimeter to check whether the three-phase input voltage and neutral line are normal.