Both of my K2s were connected to the same computer and both suffered the
same fate of loss of KIO2 communication. I am not sure of the exact
cause or the exact time it happened.. Several of the USB ports are not
working now and the computer has been taken off line.
I replaced a burned out
Ted,
That 5 volts at KPA100 U4 pin 11 comes from the base K2 - Control Board
U6 pin 24 (and the pullup resistor pins 3 and 4 of RP7).
I suspect CB U6 pin 24 may be shorted.
Since you have 2 K2s, you might try swapping the firmware between them
and see if the problem follows the firmware.
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