1. Open the side door panel of the security inspection machine (the middle one), and check whether the industrial control computer on the equipment is started. (The light will be on at startup) As shown below：

Turning on the light is a normal startup state.
2、 Open the back cover of the console. At the bottom, you will see the device connected with three signal input cables. Check whether the power indicator on the device is normal (the light is in a normal working state). If you ca n’t see the light, follow the steps below:
① From left to right, remove the first signal input line; as shown below:

②Remove the signal input cable on the monitor. As shown below:

③ Connect the signal input cable removed from the splitter directly to the monitor, and then check whether the single monitor of the monitor is normal. As shown below：