Don: Thanks so much for your help. When I recorded the erratum regarding RFC8, I marked it on pg. 31. Once the jumper was installed, everything measured perfectly. Have a great evening. Ed > Date: Sat, 6 Jun 2009 21:50:09 -0400 > From: [email protected] > To: [email protected] > CC: [email protected] > Subject: Re: [Elecraft] troubleshooting elecraft k1 voltage checks > > Ed, > > Go through the checks that I have indicated anyway and let us know how > far down the list you get without the voltage going to zero. When you > have found where it goes to zero, that is the failure point. > > 73, > Don W3FPR > > E Neubauer wrote: >> 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 >>>> >>>> >>>> >>
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