Is the transformer power light on? If it is check the voltage with a voltmeter and confirm it has power. If it's on and there is no voltage perhaps the transformer died. Check the plug for corrosion and make sure it hasn't melted. Smell the transformer and if it smells like something sweet has burnt, then chances are it has fried. If the light to the transformer won't come on at all, first check the obvious and move the plug to a known working receptacle and if it still won't come on, then again it's the transformer. Now keep in mind that the robot may have overloaded the transformer or the transformer just died of natural causes, so replacing the unit may work or work for a while with the same result. I will look at mine and see if there is a fuse that is accessible and report back.
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