I'll add my enthusiastic endorsement for Don, W3FPR. He's prompt and reasonable.
73! Ken - K0PP On Feb 19, 2018 18:50, "Bill Johnson" <[email protected]> wrote: > Dave, my suggestion: send it Don who is a fantastic expert. He is very > reasonalble in his fees. While I am technically competent, and have the > equipment, he is natural at it. I have to work at it, because unlike Don, > don't do it day to day. I have sent equipment to him and it is done in no > time. If you have time to do your own work, then give that a shot. For > me, life it too short. > > > 73, > Bill > K9YEQ > > > > -----Original Message----- > From: [email protected] [mailto:elecraft-bounces@ > mailman.qth.net] On Behalf Of Don Wilhelm > Sent: Monday, February 19, 2018 6:28 PM > To: David Perrin <[email protected]>; Elecraft <[email protected]> > Subject: Re: [Elecraft] K2 is dead? > > David,[Bill] n > > There are several possibilities. > While it is possible that the "serial" cable may have been the the > problem, that could have damaged the KIO2 (or KPA100), but it could also > have damaged the MCU (U6) on the control board. > > Did it go into transmit with no load? If so, it may be that Q7 and Q8 > have been damaged. Check the resistance from the collector to ground. > It should start out at about 2k ohms and increase in resistance as the > electrolytics charge. If it is substantially less than that, the PA > transistors may have been damaged - that will trip the internal resettable > fuse (F1). > To remove 12v power from the PA transistors, you can remove them (do that > if the resistance check reveals them to be shorted), or you can remove > transformer T3. > After removing 12v from the PA transistors, see if the K2 powers on. > > I don't know of anyone who is skilled in troubleshooting the K2 in central > FL, but someone may volunteer. > > If you remove the PA transistors and do not have adequate desoldering > ability, clip the leads at the transistor bodies and remove the leads one > at a time. Clean up with solder wick and if solder remains in the holes, > heat the pads and push the solder out with a wooden toothpick. > Replace the PA transistors with the K2PAKIT from Elecraft - it has matched > PA transistors. I can give you some tests to check with the PA transistors > out to check whether transistors Q11 and Q13 are OK (they are included with > the K2PAKIT). > > > 73, > Don W3FPR > > > On 2/19/2018 10:20 AM, David Perrin wrote: > > Hi- > > > > Two questions? > > > > After 18 years my K2 doesn’t turn on. I did it. I must have incorrectly > wired the Serial cable. When it got plugged in - that did it. > > > > There is power thru the Power button. With the radio disassembled to the > main pc board, (sans everything that can plug into the main board) and > power applied thru the 1/8” coaxial power connector power doesn’t seem to > get beyond that. > > > > I am not in a place where I can get more parts out on the bench, nor the > equipment except for a cheap digital Voltmeter. > > > > Question 1: Is there someone in the central Florida area who knows this > radio and can shed some light on my problem? > > > > Question 2: Is there someone in central Florida who repairs the K2? > > > > Thanks for reading. > > > > 73 de Dave > > > > [email protected] > > > > ______________________________________________________________ > > 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] > > > ______________________________________________________________ > 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] > ______________________________________________________________ > 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] ______________________________________________________________ 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]
