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servo not working

hi guys i have a query please try helping me out i have brought 5 servos from hobbyking in which one of them is not working

it got stuck it is not moving its shaft i think so it is jammed now what should i do

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Servo is locked in place:

Open the case and make sure the gears are properly aligned.
Next check the case top for wear. If wear is evident, replace the case.

Maybe it is defective.

If the shaft is twitching like it's stuck. You can always try putting a 470uF capacitor across it's power leads. + end of the cap to the + end of the servo and - end to -.