K2 bargraph and high current problem

[g0who]

   My K2 bargraph display (both dot & bar) disappears when I  transmit. I also get a high current warning, all bands, display shows 3.6 amps whether 5 watts, 10 watts or 100 watts.
    Any suggestion of a likely cause please.
    Robert g0who

[Don Wilhelm-4]

Robert,

Those conditions are often an indicator of damaged diodes in the KPA100
wattmeter (D16 and D17).
To make further checks, add an external wattmeter between the KPA100 and
the dummy load.
Set the requested power for 20 watts, then in CW mode, tap the key.
What is the power output?  If it goes to full power (over 100 watts),
then you have confirmed that the power control mechanism in the K2 has a
problem - the most likely is damaged diodes (but there can be other
damaged components that produce similar results).

Let us know the results from the above test and we can proceed.

73,
Don W3FPR

On 10/2/2011 4:02 PM, g0who wrote:

>     My K2 bargraph display (both dot&  bar) disappears when I  transmit. I
> also get a high current warning, all bands, display shows 3.6 amps whether 5
> watts, 10 watts or 100 watts.
>      Any suggestion of a likely cause please.
>      Robert g0who
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/K2-bargraph-and-high-current-problem-tp6853265p6853265.html
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