I connected the servor just like you did, and I also have Rambo V.1.1b. However, when I powered it up it kept "moving". For Instance, when the printer powered up it would move by 10 degrees or so, then it would randomly move on it's own. Sometimes retracting to 90 degrees, some times just a few, but I could always hear it moving. The machine crashed several times after using M280 to move the servo, re-flashing the firmware fixed it, but the jitter still remained. Looking around it seems that I may have to try applying Resistor to the circuit, What servo are you using? I'm using a HS-55 I picked up from a hobby shop, and I'm wondering if it is drawing too much current?
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