Burke, That indicates that Z1 has a high resistance connection - it could be inside Z1 (faulty Z1) or it could be in your soldering. Check (and re-flow) the soldering at U1 pins 3 and 4, RP3 pins 3, 4, 5, 6, 7, 8, 9 and 10 and pins 1, 2 and 3 of Z1. If that does not fix it, blame Z1.
73, Don W3FPR Burke Jones wrote: > Okay. Here is what happens. I was lucky when I turned it on to check > it was having problems because it sometimes works right. > > The display showed .8 and 0 volts. I would turn it and it would go to > 4.89 volts and the display would change to .9 and the voltage would > stay at 4.89 until I turned it a bit. Then the display would change > to .8 and the voltage would be 0. > > It would just repeat this over and over everytime I turned z1 a bit. > > Then it started working and the voltage would be 0 until I turned it > and it would go up into the 5 volt range and then back to 0 when I > stopped turning it. > > Does that seem to indicate a z1 that is faulty sometimes? > > Burke Jones > Sent from my iPhone > > On Mar 14, 2009, at 7:37 PM, Don Wilhelm <w3...@embarqmail.com> wrote: > > >> Burke, >> >> Yes, you can test the encoder and its circuit to the microprocessor >> with a DMM. >> Measure the voltage from the encoder pins as you slowly rotate the >> encoder shaft. The outer two pins in the row of 3 are the ones to >> measure. As you rotate the shaft, the voltage should jump between >> zero volts and something close to 5 volts. If it does not go to >> zero, there is a problem with the encoder. >> If the voltage does not go up to the vicinity of 5 volts, look >> carefully at RP3 and U1 pins 3 and 4. >> >> If that does not reveal a problem, I can give you some resistance >> checks to make too. >> >> 73, >> Don W3FPR >> >> Burke Jones wrote: >> >>> I am almost done with my KX1. During each test section I have >>> noticed that there seems to be a problem. Sometimes turning Z1 >>> changes the frequency display but sometimes when you turn it the >>> last 2 digits on the display just go back and fourth - like from 1 >>> to 2 then 1 then 2. >>> >>> I have triple checked the solder connections at Z1. >>> >>> I am trying to figure out if I might have a faulty Z1 encoder. Can >>> anyone tell me how I could use my DMM to test directly at the >>> "leads" of the Z1? If so which leads and what should I look for? >>> >>> Thanks for all your help!! >>> >>> Burke Jones >>> N0HYD >>> Http://www.n0hyd.com >>> >>> Sent from my iPhone >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:Elecraft@mailman.qth.net >>> >>> 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: 8.0.237 / Virus Database: >>> 270.11.13/2001 >>> - Release Date: 03/14/09 06:54:00 >>> >>> >>> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > 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: 8.0.237 / Virus Database: 270.11.13/2001 - Release Date: 03/14/09 > 06:54:00 > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
