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This is my first experience using digital servos and am not sure if they are operating correctly. I'm building a Raptor 50 and just installed all of the servos (9252's and 9254 w GY401). When I turn on the power without the linkages connected, they do not make any noise. However, when I connect the linkages, most of them make a humming noise. I checked the linkages and none of them appear to be binding. Is this normal or am I missing something? Any advice is greatly appreciated.