[Elecraft] K3 - no output power

[Christian Janssen DL1MGB]

CB1 is OK, voltage is available after the breaker.

7R standby: 6 V / TUNE: 0,2 V
7T standby: 0 V / TUNE: 6 V

73s Chris


Am 25.03.2021 um 06:45 schrieb 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
> 
> .-.-. --... ...--     -.. -.. ----- ...- ...
> 
>> 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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>>>  
>>>
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>