Hi Don I feel a little embarrassed about this.
After having built the control board and front board with no issues, I have built kits before and know the pain when placing a component wrongly and then having to remove and replace said component, and being extremely careful not to make this mistake with the K2. This is such a silly mistake, and I only thought about it as I was getting my DMM out, I had noticed before that there is the same component markings on more than one board so I checked again, and sure enough I was plugging the probe into P5 on the RF board and not the control board. Voila, 5.9 volts at pin 1 on U1 on the RF board. I am glad it was such a simple thing. Again, many thanks for your quick response and my sincere apologies. Best regards Mick -------------------------------------------- On Mon, 9/2/15, Mick Hall <[email protected]> wrote: Subject: Re: [Elecraft] K2 Build: Voltmeter Probe Assembly help To: [email protected] Date: Monday, 9 February, 2015, 9:16 Hi Don Thanks for the quick response. I will go through these steps this evening when I get home from work and let you know how I get on. Regards Mick -------------------------------------------- On Sun, 8/2/15, Don Wilhelm <[email protected]> wrote: Subject: Re: [Elecraft] K2 Build: Voltmeter Probe Assembly help To: "Mick Hall" <[email protected]>, [email protected] Date: Sunday, 8 February, 2015, 23:48 Mick, Since you have a DMM, read the voltage on RF Board U1 pin 1 to ground with your DMM. If it is something other than a nominal 6 volts, then you have a problem with the voltage regulator or something else on the voltage regulator output. This is the first step of your testing - make sure you have a valid voltage there to measure. If all that is correct, then you can proceed to evaluate the voltage probe. Make certain the jumper on the P7 header is set to EXT. Use your DMM (with K2 power off) to measure the resistance between the probe 'tip' and the center pin of P7 (measure on the back of the Control Board). You should see near zero ohms. If it is not zero, then check that the crimp pin in the probe is inserted and seated correctly. Those crimp pins give many builders trouble. Then power up the K2 and again touch the 'probe' to RF U1 pin 1. If it does not indicate something near 6 volts, check the soldering of CB R9, R10, U3, and U6 pin 5. If you do not resolve this problem, then there is a chance that you will be plagued by "LO BAT" messages. 73, Don W3FPR On 2/8/2015 4:37 PM, Mick Hall wrote: > Hi > > I have been progressing through the tests on my K2 build (7587), and have assembled the voltmeter probe as per instructions on page 44 of the manual, and engaged the crimp pin in the upper part of the housing as per the diagram. > > When I touch the tinned end of the wire on pin 1 of the I/O controller, U1 on the RF board, I get a reading of zero volts on the K2 LCD. It is meant to be 6V approx. > > I have tested with my DMM that their are no breaks in the probe. All other tests, before and after, have been fine up to the start of Assembly Part II . > > Is this anything to worry about? > > ______________________________________________________________ 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 Message delivered to [email protected]
