[Elecraft] K3 - no output power

[Harald Fritzsche]

Hello Chris, all,

According to your current consumption the 10w PA driver is working, but KPA3 gets no input or has not 12V.
Check CB1 CKT BKR (KPA3 page 1 of 2 in K3 schematics) and check if TR-Switch gets plausible voltages (KPA3 page 2 of 2, 7R and 7T).

Since there is no plausible idle current from KPA3 the CB1 seems to be defect, most likely.
Not sure if this can happen.
Or give me a call, # sent separetly.
Vy73
Harald
DD0VS

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> Am 25.03.2021 um 05:35 schrieb Christian Janssen DL1MGB <chris at dl1mgb.com>:
> 
> I am not sure if there is a frequency shown when in TUNE mode. My memories tell me that the top line shows the SWR and the bottom line shows the power.
> 
> 73s Chris
> 
> 
> 
>> Am 24.03.2021 um 21:32 schrieb Harald Fritzsche (DD0VS):
>> Hello Chris,
>> 
>>  
>> 
>> strange is, that your Display does not show a frequency, but it should.
>> 
>>  
>> 
>> I had a water Intrusion in 2019 which causes several defects.
>> 
>> I was testing along the Signal path to see the Signal (with RSP-spectrum analyzer), that helped me, to find the defects. It tooks a while also with help of the list here.
>> 
>>  
>> 
>> Receiving is working?
>> 
>>  
>> 
>> Vy73 & GL
>> 
>> Harald
>> 
>> DD0VS
>> 
>>  
>> 
>>  
>> 
>>  
>> 
>> Gesendet von Mail <https://go.microsoft.com/fwlink/?LinkId=550986> für Windows 10
>> 
>>  
>> 
>> *Von: *Christian Janssen DL1MGB <mailto:chris at dl1mgb.com>
>> *Gesendet: *Mittwoch, 24. März 2021 21:05
>> *An: *elecraft at mailman.qth.net <mailto:elecraft at mailman.qth.net>
>> *Betreff: *[Elecraft] K3 - no output power
>> 
>>  
>> 
>> 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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>>  
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