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:[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: 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:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
