Just put a diode in the power circuit to the ramp. If the ramp will not work, your diode is in backward and the one in the ramp is working. If the ramp still vibrates without any change, you got the diode in the right direction and the one in the ramp is good. It the vibration slows down, the rectifier in the ramp is bad and the one you put in the circuit is working as a replacement.
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