[Elecraft] K2 KPA100 overheating/erratic fan problem

[Don Wilhelm]

Yes, a standard serial cable plugged into the AUX IO connector will 
cause "strange happenings".

73,
Don W3FPR

On 1/6/2021 2:27 AM, nu6n at yahoo.com wrote:
> Hi Don,
>
> I think I tracked the problem and I would like to document it for 
> future generations :).
> I noticed that during SKCC events I don’t have the issue. In the 
> following  contest instead of using internal keyer though serial port 
> I switched to an external keyer and sure enough the issue did not 
> surface. That brought me to a serial port cable that was provided by 
> the previous owner of the K2. I found that the cable was just a 
> standard serial extension cable. I quickly made a makeshift serial per 
> Elecraft recommendation and was not able reproduce the problem with 
> the correct cable. I ran the K2 in Winter RAC and it worked as 
> intended. I am happy that I did not fry a chip with the wrong cable 
> but apparently wrong cabling may introduce a quite strange side effect 
> that makes the chip work incorrectly when it is under the temperature 
> pressure.
>
> 73, Arkady/NU6N