Servo noise

[giantsfan2575]

This is driving me crazy. I just got a z4800s servo for my B4. I put it in, centered it, hooked it up, then turned on my power for my transmitter. the servo makes a hum like it has a load on it, when I jiggle the wheels it stops until I turn the wheel again then it starts all over. anyone know what could cause this?

[yimmyc88]

I had that with my hitec digital servo, I beleive it is because being digital it fights to keep a perfect center. I could be wrong.

[nmt6789]

If its a digital servo, it will always make noise. Digital servos are constantly checking their position.