All,
I"m working with a USB 1.1 keyboard which must go through a 7,000V static discharge directly onto it's DB-9 connector.(Chassis/Enclosure) Whenever this test is performed the keyboard has a couple failure modes.
1. Hit key after discharge and no output to computer. Though, any key struck after that has an output and is seen on my computer without a problem.
2. USB fails and must unplug the USB cable and plug it back into the keyboard. Once that is done it works fine. (Hard failure)
I"m a little lost as where to start with my debugging as I have never done any testing like this. Does anyone have some starting points which I could look into? Or are there some key things about USB which I need to look for?
Thanks for any responses!!!
-mike