Hello Don, Don, the call was in the subject line.
Sorry for the confusion. I had the pll circuit working great with all alignments before starting on phase 3 and putting the ssb board in. As far as checking parts, the parts were correct when I checked them the second time, and the pll circuit was working. tp3 reads within tolerance. Unfortunately I broke the agc gain transistor handling the control board, so have to replace. But that shouldn't affect my issue. I was doing some voltage readings and found an issue on u5 on the rf board. pin 1 was 5 volts. U6: pin 5 was 4v on and 8 was 8 volts. tp3 reads good, and checked good. However sometimes it feels as if it doesn't check good because the band - doesn't keep the freq down on occasions. N0XDB -- mailto:[email protected] Saturday, April 17, 2010, 5:41:52 PM, you wrote: > Foxjazz, > Do you have a real name and a call? We here on the Elecraft reflector > certainly would like to know if you do. > Q6 on what board has the bad resistance reading? The Q6 on the RF board > has nothing to do with your PLL problem. > Is it at TP3 that you are getting a reading of 0.00 kHz? If not, let's > start from there. The most likely source of no reading at TP3 is a > problem with RF Board Q19. And the problem wiht Q19 is most likely > soldering somewhere in that circuit. Turn to the schematic for the RF > board sheet 1 and look in the upper left quadrant (up to but not > including U4) to identify all the components associated with the PLL > Reference Oscillator. Check the resistance from the source of Q19 to > ground - it should be close to 270 ohms - if it is higher, check the > lead tinning of RFC14. > You may have a solder bridge on the thermistor board (notice on the > schematic that it is one of the components associated with the PLL Ref > Osc). Make a quick check - the voltage on pin 5 of RF Board U6 should > be very close to 1/2 the voltage on the 8 volt rail (check that at U6 > pin 8). > Have you checked to be certain the counter probe is still working > properly? To check that, put the probe into TP2 to read the BFO > frequency. If that also reads 0000.00, you have a problem either with > the probe or Control Board Q9 and/or Q10. > Please be specific so we can help you better without creating a 'wild > goose chase'. > 73, > Don W3FPR > Foxjazz wrote: >> Hello Elecraft, >> >> Hello Don, >> >> >> I had the pll working before I did phase 3 and put the ssb board in. >> >> It was working great, now it isn't. I thought I would run a quick >> voltage test before continuing. Now the pll freq is 0.000 >> >> I reviewed the test results and re-tinned T5 just to ensure good >> conductivity. >> >> When I ran the resistance checks the base resistence of Q6 was at >> 372 ohms not 100-140 as the book says. >> >> the unit turns on draws 0.24 amps >> >> 0.22 without the ssb board in. >> >> Why would the pll circuit just quit working, would q20 have anything >> to do with it? >> >> The voltages at q18 are a bit high. >> >> >> >> >> >> I had the pll vol >> >> >> ______________________________________________________________ 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
