Robert, Can I assume correctly that you are asking about U4 and U5 on the RF Board? If so, yes, these are digital signals and yes, the voltages listed are incorrect for normal measurements. If you look with a triggered oscilloscope during the active levels, the voltages will be correct.
73, Don W3FPR Robert Greenwalt wrote: > I completed the baseline k2 kit but I seem to have some problems: > > The Voltage measurements from pg17 of the trouble shooting section differs > from what I'm seeing in the receive case: > U4 5-pin should be 5 but I get 0 > U4 7-pin should be 0 but I get 5 > U5 1-pin should be 0 but I get 5 > U5 2-pin should be 5 but I get 0. > > I've traced through - U4, 5-pin is connected to U5-2 and 3 pins on the > control board. I've followed the leads and they are clean. > I've resistance checked them and everything appears properly connected. > I've also checked resistance to ground and U4-5 is not shorted. Likewise > U4-7 connets to U5-1 and two chips on the control board. They seem to be > digital logic pins, so I wonder if the listed voltage is incorrect? > Otherwise it seems one of my chips is bad. > > Suggestions? > > Thanks > > Robert > ______________________________________________________________ > 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: 9.0.722 / Virus Database: 270.14.122/2590 - Release Date: 12/28/09 > 02:16:00 > > ______________________________________________________________ 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
