Hi

I recently bought 4 9202, GY 401 + 9253.

I connected my receiver to the gyro and servos on my table. The servos are not connected to any load. I was trying to see if all servos are working properly.

3 9202 servos and the 9253 servo were fine. There was something odd in the 4th 9202 servo.

I turned my Tx on and then my Rx on (9CHP + RD149). Immediately after the Rx was on, the 4th servo began making a sound as if its engine is working. The servo arm was not moving but the servo was shaking. After 2 seconds or so the servo was quiet again. The servo was connected to the throttle servo. When I move the throttle stick up the servo arm moved but the servo was making noise and shaking about two seconds AFTER I stick movement was done but the servo arm only moved while the stick was moving (as expected).

I tried the same when this servo was connected to the elevator channel with the same results.

Is there something wrong with this servo? Why does its internal engine running AFTER the stick movement has ended?

Thanks,
Shanti

shanti,
I would have the servo inspected by your service facility in the region of the world where you purchased it.