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

Before doing anything else, please do the following, and double-check:

- Disconnect the SX-Key from the SXTech board, and also pull out the SX28.
- Make sure that the power supply has correct polarity, and then turn it on.
- Take a voltmeter, and check if the voltage between pins 2 and 4 of the SX28 socket is 5Volts (+ at pin 2, - at pin 4). When it is remarkably higher, the on-board regulator may be fried.
- When you have measured 5 Volts, disconnect power, plug in the SX-Key, oriented correctly and aligned with all four header pins. Do not insert an SX28 in the socket yet.
- Turn on power again.
- Does it still pull 400mA, and get hot?

If yes, I have bad news - most likely, your SX-Key is fried - if not, your SX28 may be in semiconductor's heaven, so hopefully, you have another SX28 on hand to try.

And ALWAYS turn off power before attaching or removing the SX chip, or the SX-Key!

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