In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

Let me take a guess...

Assuming that a component on your SX-Key is blown - if it is one of the two cuboid-shaped parts close to the SUB-D9 connector and the round part (which is a coil), you have killed a 15µF/10V electrolytic capacitor. It is most likely that it fries when you apply the wrong supply polarity. Nevertheless, other components, like the SX20 may also have been sent to "component's heaven" without sending a "smoke signal" before, so good luck!

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