Explain in detail how to judge the failure of mobile phone signal shielding device and how to maintain it.

To judge whether the mobile phone signal shielding is out of order, first look at whether the power indicator light on the fuselage is still on. If it doesn't light up, it may be that the indicator light is broken, not necessarily that there is something wrong with the equipment. The indicator light is on, which does not mean that the equipment is ok. At this time, we just need to actually test the mobile phone, find three mobile phones, Unicom and Telecom, and stand near the machine to see if we can make a phone call and surf the Internet. If nothing works, there is nothing wrong with the equipment. If you can make a phone call or surf the Internet, it means that the machine is out of order and needs maintenance. At this time, it needs to be sent back to the original factory for inspection and maintenance, and it can't be repaired by itself.