Woops. Sorry. I meant to say I got the correct voltage for pin 16. All others in the chart are at <.1 V. ================
> Date: Sat, 6 Jun 2009 21:24:44 -0400 > From: [email protected] > To: [email protected] > CC: [email protected] > Subject: Re: [Elecraft] troubleshooting elecraft k1 voltage checks > > Ed, > > I am not certain how you have 5.8-6.2 volts at P1 pin 15 and zero volts > at P1 pin 16. > > The number of components you have installed at this point is not large, > so I suggest you trace the voltage from the input. Check the following > points in order (stop when you find one that is substantially lower than > I indicate because further checking is futile). I will assume a 12 volt > power source for the initial readings so adjust anything that I have > indicated 12 volts as expected for your actual supply voltage. > It may be helpful for you to follow along in the schematic to see "what > is connected to which". > > The center of the coaxial power jack (J4) - expect 12 volts > The anode of D16 - expect 12 volts > The cathode of D16 - expect 12volts minus 0.3 volts > Both ends of the RFC8 position on the bottom of the board (RFC8 is a > jumper at this point) - expect 12v minus 0.3v. > The "IN" pin of U5 - expect 12v minus 0.3 volts > The "OUT" pin of U5 - expect 7.5 to 8.5 volts > The "IN" pin of U6 - Expect same as above > The "OUT" pin of U6 - expect 5.8 to 6.2 volts. > > If all those are correct (these are the voltage sources), check the > soldering at the U6 "OUT" pin and U3 pin 6, and check the soldering at > P1 pin 16. > > 73, > Don W3FPR > > > E Neubauer wrote: >> Hello: >> I am in the midst of building the rf board for the K1. All went well until >> page 30 in the manual. >> I performed the voltage checks and the only one that works is the one at p1 >> pin 15. The others read "zero" on my DMM. I rechecked all soldering - no >> solder bridges or cold joints. I went back to the beginning of the rf board >> assembly and double checked every component's installation and orientation - >> all fine. >> >> Has anyone got suggestions about where to start to diagnose the problem? >> Thanks very much. >> Ed >> >> _________________________________________________________________ Windows Live™: Keep your life in sync. http://windowslive.com/explore?ocid=TXT_TAGLM_WL_BR_life_in_synch_062009 ______________________________________________________________ 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
