[Elecraft] KRC2 silkscreen gotcha

[Paul Fletcher]

Hi Paul,

I’ve not used it with a radio yet, this was to communicate with a PC to configure the KRC2 (though the same issue would apply to anything using RS232). The KRC2 wasn’t responding at all hence the start of fault finding and the findings I posted. As soon as the resistors were corrected everything worked as it should without issue.

Hope this helps.

73 Paul M1PAF

> On 19 Nov 2020, at 20:52, Paul GACEK via Elecraft <elecraft at mailman.qth.net> wrote:
> 
> Hi Paul
> 
> Thanks for the heads up.
> 
> I had some communication issues with my KRC2 in that it worked like a champ with my K2 but not so with my KX3.
> 
> I’m going to crack open my krc2 shortly and see what values I have in those two resistor locations.
> 
> What radio where you using with the KRC2?
> 
> Paul
> W6PNG/M0SNA 
> www.nomadic.blog <http://www.nomadic.blog/>
> 
>> On Nov 19, 2020, at 12:47 PM, Wes <wes_n7ws at triconet.org <mailto:wes_n7ws at triconet.org>> wrote:
>> 
>> Thanks.  I've owned one of these for years and as I recall, it's always been a problem so it's been resigned to the junk box.
>> 
>> Maybe I can resurrect it to make it useful for something.
>> 
>> Wes  N7WS
>> 
>>> On 11/19/2020 12:58 PM, Paul Fletcher via Elecraft wrote:
>>> FAO anyone who's had issues getting the serial comms working on a KRC2:
>>> 
>>> R12 and R13 are transposed on the silkscreen on the PCB. I fell foul of this
>>> when I recently built my KRC2 and it wouldn't communicate. After quick probe
>>> around it was evident there was no negative voltage to the RS232 driver, U2.
>>> A little further probing revealed no 12V present at R13 but there was at
>>> R12. It was then I realised the component layout in the manual is different
>>> to that marked on the PCB. A quick swap of resistors and everything works as
>>> it should.
>>> 
>>> I've re-read the errata and the manual and there is no reference to this
>>> issue. Apologies if it's been flagged up on here already but I couldn't find
>>> anyone pointing this out though there do seem to be a few people with serial
>>> comms issues with the KRC2.
>>> 
>>> Hopefully this is of assistance to someone.
>>> 
>>> 73 Paul M1PAF
>> 
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