Quote:
Originally Posted by Jope
You could take an oscilloscope to each line in turn and check to see what levels they output.
Or perhaps just blindly replace the keyboard MCU. :-)
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Thanks for the suggestions.
The good news is I have an oscilloscope. The bad new is I don't really know how to use it, and to be honest, I'm a little cautious about using it with something that's mains earthed. I do really want to be able to use it for such occasions though...
I guess a replacement MCU may not be easy to find either...