Fc 40 transmitter trouble

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Dec 23, 2014
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I have a replacement fc40 transmitter and i thought i should calibrate it. I went into the naza software, basic tab,RC tab and under the command sticks calibration all seems good except the third one down (throttle) it is showing the slider all the way to the left and is black in color, not green like the other three? What am i doing wrong? Any help would be appreciated..
 

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