I agree... Don is amazing! I look for his comments even if I don't have any issues. Hats off to Don!!
73, Bill K9YEQ K2 #35; KX1 #35; K3 #1744; mini mods ATS-3B -----Original Message----- Subject: Re: [Elecraft] K1 with Issues I read Chuck's description of his problem, and I thought, "What in the world?" Don Wilhelm deserves a round of applause for this diagnosis. Peter N8MHD On 4/16/09, cstove...@aol.com <cstove...@aol.com> wrote: > > > Hi Don, > > Your comment about using flux cleaner struck a nerve with me.? I didn't > > Measure the voltage at pins 4 and 5 of RF Board RP5 and compare with the > voltage at Front Panel U1 pin 5. They should be the very close to the > same voltage. If not, check the values of R19 and R20 and re-flow the > soldering of RP5, R19 and R20.? > ? > > If you had ever attempted to clean the flux from your K1, that could be > the cause. If some flux cleaner residue wicked up under the key jack, > it can create a leakage path which would explain your problem. The only > cure is to remove the key jack and clean both the board area under the > jack and the bottom of the key jack.? > ? > > It is conceivable that the key jack itself could have some kind of > leakage path inside. To check, you will have to remove the key jack and > replace it if necessary.? > ? > > Do the solder re-flow first - a bad connection can work fine for a > while, and then fail later after a bit of oxidation occurs. If that > does not cure it, remove the key jack and check again with the jack > out. Replace the key jack if required.? > ? > > 73,? > > Don W3FPR? > ? > > cstove...@aol.com wrote:? > > > My K1 (sn2450) went together back in Oct 07 without a hitch and has been > working flawlessly ever since.? > > >? > > > A big glitch showed up tonight.? When I pushed the attenuator button it > started transmitting dashes.? That cleared by cycling the power.? I then > tried sending the content of memory 1.? It began sending that message, > stopped, "end" appeared in the display, then started transmitting > alternating dots and dashes.? When locked in transmit, the display blanks > out.? Initially I verified that it was transmitting with another receiver, > but now it seems to have lost output too.? It was hooked up to a resonant > antenna or dummy load, so I wouldn't think the final fried.? I'm running it > off a supply at 13.6VDC.? > >? > > > A voltage check of RA3 pin 5 of the MCU shows 5.6V with both dot and dash > contacts open.? When the WPM-/attn button is held the dashes start sending > and the pin 5 voltage drops to 5.0 even? though the contacts are still > open.? > > >? > > > I've been awake too long and not much is making sense, so I'm going to > call it a night.? Any ideas or suggestions on where to look would be greatly > appreciated.? > > >? > > > Chuck? K4QS > > ______________________________________________________________? > > > Elecraft mailing list? > > > Home: http://mailman.qth.net/mailman/listinfo/elecraft? > > > Help: http://mailman.qth.net/mmfaq.htm? > > > Post: mailto:elecr...@mailman.qth.net? > > >? > > > This list hosted by: http://www.qsl.net? > > > Please help support this email list: http://www.qsl.net/donate.html? > > > ------------------------------------------------------------------------? > > >? > > >? > > > No virus found in this incoming message.? > > > Checked by AVG - www.avg.com > > Version: 8.0.238 / Virus Database: 270.11.57/2060 - Release Date: > 04/15/09 06:34:00? > > >? > > > > > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html