[Elecraft] KPA500 Help - After 2 weeks : still no able to load firmware

[Nicolas Drin]

Hi 

After two weeks, still in trouble.

1 - I DO know that the Mac + USB/serial cable are working : no problem to
communicate with K3 and P3
2 - if you don't trust me I also used a PC with another USB/serial...
3 - I checked many time the 2 ribbon cables on the I/O board of the KPA500
4 - I put a NEW I/O board send by Electraft ...
5 - At the first attempt, good communication with the KPA500 and beginning
of the firmware load..(STBY led flashing nicely...)
6 - after 30 sec message : MCU load failed 
7 - after MANY others tests - no (or sporadic) communication with KPA500 
(using MAC or PC)

It looks that something is wrong with the CPU ??
 Is it possible to reset the CPU ?

Any help will appreciated but (please) IT IS NO a problem of computer .

Regards

Nicolas, F5HFZ




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