Chuck, Glad to hear of your success. Enjoy that K1.
73, Don W3FPR [email protected] wrote: > Hi Don, > > You nailed it!? Lesson learned on my part.? > > There was a difference in voltages between pins 4 and 5 of RP5 and pin 5 of > U1.? I cleaned up around RP5, R19 and R20 and reflowed the solder connections > with no real change in symptoms.? I lifted the key jack from the board.? > Although I could see nothing with my eyes on the board, when I swabbed the > area with a Q tip and Isopropyl the Q tip turned bright red. > > The loss of transmit I noted turn out to be a loss of both transmit and > receive.? I was on the dummy load so didn't notice how quiet the receiver was > until I switched to an antenna.? Apparently a relay got hung up in all the > electronic commotion.? I cycled the band switch and everything popped back to > life when I came back to band 1. > > I disassembled the rig and gave each board a good cleaning and didn't find > anymore red stuff. > > It's all back together now and working fine. > > Thanks. > > Chuck K4QS > > > > > > > > -----Original Message----- > From: Don Wilhelm <[email protected]> > To: [email protected] > Cc: [email protected] > Sent: Thu, 16 Apr 2009 9:38 am > Subject: Re: [Elecraft] K1 with Issues > > > > > > > > > > Chuck,? > ? > > Flux cleaners are *not* recommended for that very reason. The flux > residue by itself is non-conductive, but when combined with a cleaner, > it can create high resistance (leakage) paths unless it is completely > removed. Flushing an area with cleaner is almost certain to cause > trouble, and can result in 'mysterious behaviors' that are hard to track > down and expensive repairs.? > ? > > If a builder finds a need to remove the flux, it is best done using a > cotton swab (Q-Tip) and denatured alcohol or rubbing alcohol working > only in small areas at a time.? > ? > > 73,? > > Don W3FPR? > ? > > [email protected] wrote:? > > >> Hi Don,? >> > > >> ? >> > > >> Your comment about using flux cleaner struck a nerve with me.? I didn't have >> any cleaner at the time of completion and obtained some a while back.? I >> don't remember exactly when.? I had an idle mind and hands one day and >> opened up the K1 to spiff things up.? I let it dry for a week and put it >> back together and it worked fine.? >> > > >> ? >> > > >> The keying misbehaved a little during the previous use of the K1.? I cleaned >> the paddle contacts and reseated the plug and all seemed well.? Problem >> solved, or so I thought.? These two events probably relate.? >> > > >> ? >> > > >> At first opportunity I will make the voltage checks and take a look under >> the key jack. I'll post the results.? Right now I'm off to install an >> antenna on my Volunteer Fire Departments new utility truck.? >> > > >> ? >> > > >> Thanks.? >> > > >> ? >> > > >> 73,? Chuck K4QS? >> > > >> >> ? >> > > > > > > ______________________________________________________________ > 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 > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.285 / Virus Database: 270.11.59/2064 - Release Date: 04/17/09 > 07:08:00 > > ______________________________________________________________ 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
