Thanks Don and Gary. Have checked for bad joints and none found.
I've also checked for continuity between the EncA and B to the main processor and they are good. The radio wasn't built by me but it had another fault which I sorted. Unfortunately during the first repair process I dislodged a screw that had been dropped between the displayboard and control board by a previous user and I think that's what more than likely has taken out U3. I may have a replacement in my spares box somewhere if not it will have to be ordered. Now getting very late here and I have a 5am start so will search later tomorrow. Many thanks to you both for replying. Regards Nidge (G0NIG) IO93dv ----- Original Message ----- From: "Don Wilhelm" <[email protected]> To: "Nigel (Nidge) Smith" <[email protected]> Cc: <[email protected]>; <[email protected]> Sent: Thursday, April 08, 2010 9:52 PM Subject: Re: [Elecraft] K2 VFO / Encoder Problem > Nidge, > > Yes, from that I would surmise that U3 pin 14 is damaged - however, > check the ENC A and ENC B lines for continuity to the microprocessor > just to be sure there is nothing wrong there. > > 73, > Don W3FPR > > Nigel (Nidge) Smith wrote: >> Hi Don, >> >> Many thanks for the quick reply. >> >> So far the readings I get on U3 are as >> follows: >> >> Pin 14 = 0.1V and 0.133V when the encoder is >> rotated. >> Pin 15 = 4.12, which varies when the encoder is >> rotated. >> Pin 7 = 3.4V with slight variation when the >> encoder is rotated. >> >> So from the above would you say it's safe to >> assume that U3 has a damaged output on >> pin 14? >> >> Again thanks very much for taking the time >> to reply. >> >> Regards >> >> Nidge (G0NIG) >> >> -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.801 / Virus Database: 271.1.1/2797 - Release Date: 04/07/10 19:32:00 ______________________________________________________________ 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
