[Elecraft] KIO 2 Not operating

[Alejandro Fernandez - EA4BFK]

Hi all

I'm looking for some regrding KIO2 not operating.

I installed KIO2 option in my K2 s/n 4091 several months ago and it worked perfectly. I've just finish the K100 power amplifier in aseparate enclosure EC and inconection with K2 works peerfectly as well, but now my KIO 2 doesn't work at all.

What I've check is ok, cable ok, KIO 2 operation Ok, but if I send the test from K2 ( Display key when Port on in Menu, ) no signal can be seen in pin 25 of the main microcontroler MCU of the K2. I've made the meaure with an oscilloscope, and looks like the microcontroller is not operatring the serial signal.

I've turn off and on the Port menu of K2, and it doenst work.

All the other functions in K2 and the 100 watts amplifier works perfectlly, but not the serial controller.

Before I made a full reset, there is any idea on what's the issue?

Alex
EA4BFK

Elecraft K2 #4091+SSB+DSP+AT2+NB+KIO2???