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Finding the center
Turn the potentiometer knob by hand. At some point in its travel, the motor will stop. That's where we want to leave it. At this point we just want to learn the centered orientation of the knob -- we'll readjust it and fix it in place later.
Try this: once the potentiometer is properly centered, the motor will stop running. Now move the stick on the transmitter. Move it one way and the motor goes one way, move it the other way and the motor reverses. When you put it back in the center, the servo should stop again. Listen to the servo when it's stopped. If the potentiometer isn't perfectly centered, you may hear a little humming. You can tweak the pot to eliminate the hum.
Finding the center
Turn the potentiometer knob by hand. At some point in its travel, the motor will stop. That's where we want to leave it. At this point we just want to learn the centered orientation of the knob -- we'll readjust it and fix it in place later.
Try this: once the potentiometer is properly centered, the motor will stop running. Now move the stick on the transmitter. Move it one way and the motor goes one way, move it the other way and the motor reverses. When you put it back in the center, the servo should stop again. Listen to the servo when it's stopped. If the potentiometer isn't perfectly centered, you may hear a little humming. You can tweak the pot to eliminate the hum.