Troubleshooting the drive and speed controller on an RC car. The initial problem was an unpredictable response to the throttle which can be due to mis-calibration of the ESC, in this case it was two issues: One, the ESC required calibration and two, the transmitter reverse control was not functioning, which became apparent while calibrating the ESC. Swapping out the transmitter / receiver pair allowed the ESC to be calibrated correctly.

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