The two waveforms (2051 & receiver) are the same. The 2051 can control servo as the receiver do. But the 2051 can't control the servo as the receiver can. The two waveforms are the same(by oscilloscope). It's strange that the 2051 can't control the driver.

I am guessing can this be possible:
The receiver will send some "reset" pulses to the driver or the servo, the driver will work with the receiver only when I restart them once. If so, I think I should copy those pulses to my 2051!

I have brought that driver to the shop by my teacher. Now I'm waiting for further information for that.

Stanley