I have a t5500 that will no longer transmit or recieve with any of my other motorola walkie talkies. any ideas

Check the settings of the Frequency, Code and Qt filter on your non-functioning radio vs. the working ones. They all should match identically. Here is a link to the user guide: http://www.giantintl.com/ContentManage/manuals/Moto/T55xx.pdf

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