i have a airtronics vanguard vg4r pcm transmitter, when i went to put in a new battery pack today the battery fail safe started beeping at me, the battery metter reads full so its not low battery and i have no control of the plane. i put the old battery pack in to see if it was the battery and no change. it did this once before when i unhooked the battery pack about a year ago and i cant remember what i did to make it work again. any help would be greatly appreciated.
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