[Elecraft] K3 - no output power

[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