[Elecraft] K3 - no output power

[Christian Janssen DL1MGB]

Hello,

together with Harald DD0VS, we narrowed it down to the diode D1 on the LPA board. I will now order the diode and some probably affected parts around the diode and start replacing and testing again.

I will report again.

Many thanks to all others with giving different hints!

73s Chris DL1MGB



Am 24.03.2021 um 21:03 schrieb Christian Janssen DL1MGB:
> Hello,
> 
> it happened during the Russian DX Contest last Saturday, from one second to another. No output. When I tune the display looks like this: http://dl1mgb.com/temp/k3_no_power.jpg
> 
> Following conditions:
> 
> - sending into a 50 ohm dummy load
> - no matter how many watts are set with PWR knob
> - Test mode off
> - TX INH off
> - all driver transistors working (three screw test)
> - no output power also on external watt meter
> - happens on all bands
> - happens with KPA set to "not inst"
> - knocking on housing doesn't change anything
> - when starting the antenna tuner, it says 5.0 watts, but no output on the external watt meter
> 
> I am running out of ideas :-)
> 
> 73s Chris DL1MGB
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