Motorola t5720 walkie talkie not transmitting or receiving
To answer your questions: the airport xray should not have harmed them, and there is no reset button.
If you are using the radios with the rechargeable battery pack, it most likely needs replaced. They have a life expectancy of 12-18 months. Here is a link to the Motorola store: http://www.store.motorola.com/mot/en/US/adirect/motorola
;jsessionid=B7997F21F6A409F029D6DEC2CB194ADB.mot2?cmd=catDisplayStyle&entryPoint=adirect&catKey=601560&messageType=catDisplayStyle Clean your battery contacts both in the radio and on the battery with a pencil eraser.
There is also a chance the radios are not programmed correctly. Be certain the frequency, interference code eliminator and the Qt filter (if any) are set identical to one another. You indicate you have a manual, I will insert a link here for those who do not, who might read this: http://www.giantintl.com/RadioPDFs/Outdated%20Manuals/T56XX_57XX_User_Manual_E.pdf
Lastly, you may simply have one radio which has failed. It is not likely both would fail at the same time, short of battery issues. The three items listed above are suspect: batteries, programming or one has failed.
Best regards. Read More At : Talkabout T5720 (7 Channels) 2-Way Radio...