[Elecraft] K2 - "INFO 80 " problem

[Don Wilhelm]

Go to the Elecraft website and download the K2 A to B instructions. That 
contains a list of related mods.
You may want to also download the instructions for those mods as well.
Review those instructions against your physical K2 to see if they have 
been installed.

I would also suggest changing the IF crystals on both the RF board and 
the KSB2 (if installed).  If the crystals installed have a "-S" suffix, 
they are the new type, but any other suffix is the older type.  The new 
crystals will improve your filter passband shape.

The INFO 080 says there has been a failure of AUXBUS communications 
between the main MCU and one of the other firmware ICs in the K2 system 
(that includes the IOC on the RF Board).  Since it happens when you 
change bands, it is most likely the IOC communications. The first step 
is to re-seat the MCU on the control board and the IOC to clean any 
oxidation from the socket and the pins.  If you have the KPA100 option 
installed, it could also be the KPA100 communication - re-seat its 
firmware IC too.
If it persists, begin removing the installed options to see when it 
disappears.
That problem could also be caused by a bad solder connection.  If it is 
intermittent, it may take some time and trial and error to track it down.

73,
Don W3FPR

On 3/27/2014 2:02 AM, Giuliano wrote:
> I bought a K2 SN 670 to complete my collection Elecraft.
> I now have K1, K2 and K3 + P3.
> The K2 serial number  is very low and I think some changes are 
> essential and others less so. Can anyone tell me what mods are the 
> really important?
> I also have a problem that occurs very frequently: when I change band 
> +/-, very often comes out "INFO 080". What can I do?
> Thanks for the help
> I0CG Italy
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