Thanks Don, U8 was faulty only in that I missed soldering a pin, and missed it again while checking it with the lighted magnifier about 5 times. Clearly, I should be in bed. It's working now.
73, Sean - VA5LF On 12/03/2010 11:23 PM, Don Wilhelm wrote: > Sean, > > U8 is seldom faulty. Check your soldering - refer to the Soldering > tutorial on the Builder's resource page at the Elecraft website if you > have questions. If suspicious, re-flow the soldering with a hot iron > (750 to 800 deg F). The solder should flow out to an almost invisible > edge on both the solder pad and the component lead. If it looks more > like a ball on the solder lead, that is a sure sign that the solder pad > did not receive enough heat. If there is a lot of solder on the > connection, that can be just as bad because it masks a poor solder > joint. Wick away the excess and re-solder. Strive to have only a small > fillet of solder on each solder pad. Using a small diameter solder helps > to control how much is applied. I use .015 diameter, but the .020 > diameter is usually OK with care. With larger solder diameters, by the > time the solder flows, you already have too much solder on the connection. > > 73, > Don W3FPR > > Sean Cavanaugh wrote: >> Hi all, >> >> I'm building my K2. I've just got to the step where everything gets >> assembled and tested for the first time, and when testing the sidetone >> I'm getting nothing. >> >> I've set the K2 to edit St L and varied the value from 0 to 255, >> checking the voltages on U8. Pin 1 is 0v for all settings, and pin 4 >> is also always 0v. The Vdd pin has 5.04v, and all ground pins show >> connected to ground. It looks to me like U8 is bad. >> >> Any other ideas? >> >> Thanks es 73, >> >> Sean - VA5LF >> ______________________________________________________________ >> 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 >> ------------------------------------------------------------------------ >> >> >> No virus found in this incoming message. >> Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: >> 271.1.1/2741 - Release Date: 03/12/10 04:42:00 >> ______________________________________________________________ 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
