Please do. Also, please also send a picture of the label on the bottom side closest to the front of the device.
Jack, W6FB Elecraft Engineering > On Nov 19, 2020, at 1:47 PM, Paul Fletcher <[email protected]> wrote: > > I have a Rev C PCB and the silkscreen does not match the diagram in the Rev C > manual. On the PCB R12 and R13 are marked the opposite way round to the > manual. I can send pics if you want them. > >> On 19 Nov 2020, at 21:33, Jack Brindle <[email protected]> wrote: >> >> After seeing this report I pulled the Rev C PCB (the only PCB we have >> shipped for this product) and took a good look at it, then looked at the >> docs and finally the Gerbers for the board. >> R12 and R13 on the KRC2 PCB are properly labelled. R12, closest to the >> switches, is a 4.7K ohm resistor (yellow-violet-red) used to pull the RS232 >> line to -12V. >> R13 is next to it, closest to the DE9 connectors is a 47 ohm resistor >> (yellow-violet-black) and provides +12V power for the JFET. >> The legends on the PCB and in Figure 10 of the KRC2 Rev C manual are correct. >> >> Now, what caused you to think they were backwards? And, let’s make sure that >> you do have a Rev C board in your KRC2. >> >> 73, >> Jack, W6FB >> >>> On Nov 19, 2020, at 11:58 AM, Paul Fletcher via Elecraft >>> <[email protected]> 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 >>> >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[email protected] >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> Message delivered to [email protected] >> > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
