[Elecraft] KRC2 trouble shooting

[Don Wilhelm]

Kazu,

I am not certain how it could have been damaged either, but the fact 
remains that you either have a soldering problem  somewhere or you have 
a damaged firmware chip.  Since it did work at one time and quit working 
after you made an  connection error (even though I cannot determine how 
that error would have done any damage), I vote for the firmware chip, 
but I would try re-flowing all the soldering with a hot soldering iron 
(400 deg C) first. Add a bit of flux and be certain the solder has 
flowed out onto all the solder pads. Soldering is the most common 
problem encountered by builders.

73,
Don W3FPR

Kazunori Watanabe wrote:
> Hi Don, 
>
> Thanks for suggestion. I do not have oscilloscope but I can hear 4 MHz from K3 by putting KRC2 board closer to K3 and 
> confirm it is from KRC2 by on/off 12v to KRC2. 
> If chip was damaged, as I am using anti static mat, how chip was damaged is mystery....
>
> 73 Kazu 
>   
>