[Elecraft] k2 firmware update problems with ATU

[Don Wilhelm]

Giuliano,

Did you make the trace cut and add the wires to change the sidetone 
signal source?  The changes are shown in the KIO2 manual page 10 and 
also in the KPA100 manual page 59.

Check and double check those changes.  Especially the position of the 
wire and capacitor at Control Board P4.  The added wire and capacitor 
connects to pin 1 which is the pin closest to the upper corner of the 
control board.  If the wire is correct, be certain there is no solder 
bridge to P4 pin 2, which is the AUXBUS signal line.

73,
Don W3FPR

On 5/1/2014 7:06 AM, Giuliano Carmignani wrote:
>
> I have a K2 SN 670, so I bought the upgrade firmware (2.04r and Main, 
> i / o 1:09).
> All work well but the ATU is not working.
> The first test that fails is CALn, no data is displayed, only ATU is 
> displayed.
> AGAIN IF I INSERT THE OLD MAIN FIRMWARE ATU WORK WELL AGAIN.
> Firmware of KAT2 is 1.03
>