[Elecraft] K2 doing weird stuff again!

[Don Wilhelm]

Ed,

Do not do a reset, it will not likely fix anything.

My best guess is that Q3 in the KPA100 should be replaced.  That is the 
transistor which senses the temperature.
You should re-check the bias setting for the KPA100 after replacing that 
transistor.

The only other possibility is that the TSENSE input to KPA100 MCU has 
'gone wonky' and U1 needs to be replaced.

73,
Don W3FPR

On 12/30/2015 12:24 AM, Eddy Avila wrote:
> Don kindly helped me out a couple of years ago with my K2 (S/N 3500+) 
> with a PA HOT error when the K2 had been sitting off in my house, room 
> temp about 67degs. Lately now when I turn on K2 from a cold start the 
> fan turns on immediately and when I try to transmit into a 50-ohm 
> dummy load I get the PA HOT error and the rig won't put out power now. 
> Originally, the tPA was set for about 20c which is 68f, which is the 
> room temp in my shack.
>
> So, as a hunch I ran tPA through 255 and set it at 5c (41degs f) 
> which, I assume you, is not the temp in my house/shack....HI HI!! I 
> ran tPA back up to 20c and the PA HOT problem returned. So, I set the 
> tPA at 16c (60degs F) and my K2 is now happy!
>
> Any thoughts what's going on, is my K2 starting to head South, or 
> maybe I should consider doing a hard reset? I hate a reset cuz all the 
> filters also get reset and even after writing down all the values, 
> it's still a pain in the a**!
>
>