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
