Re: [Elecraft] K3 power down problem
Ian wrote: Date: Tue, 10 Nov 2009 15:18:00 + From: Ian Maude i...@gb7mbc.net Subject: Re: [Elecraft] K3 power down problem To: Elecraft List elecraft@mailman.qth.net Message-ID: d74929a00911100718y4a54b756lb4e980085198...@mail.gmail.com Content-Type: text/plain; charset=windows-1252 Yep as per my thread, I did it but still the same issue. I cannot imagine that was the issue though on #455 after all this time. 73 Ian 2009/11/10 Greg - AB7R a...@cablespeed.com This is the mod description from the website: This modification adds a diode to the KPA3 12V sense circuit to hold the voltage to no more than 0.6V when the K3 is turned off. Without it, some K3s refuse to turn off when the POWER button is tapped because the 12V sense circuit does not drop to a low enough level to shut down the K3???s MCU. The diode is a common leaded part. No work with SMDs is required. A minimum of disassembly is required and no boards need be removed to perform this modification. You're not alone Ian - we have two K3s #320 and #321 in a Multi-Single or Multi-Two arrangement for CW contesting. #321 developed the power down problem so I did the mod. No effect at all. #320 has never had the problem, even though they run off the same 12v power supply. Not a show-stopper - I just disconnect #321 until contest time.G 73, Ken ZL1AIH (ZM1A in contests) __ 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
Re: [Elecraft] K3 power down problem
Hi Ian, Have a look at the KPA3 12V Sense Mod on the modification page. It maybe the answer to your prayers. 73 Stewart G3RXQ On Tue, 10 Nov 2009 10:49:03 +, Ian Maude wrote: Hi all, For some reason my K3 will not switch off this morning. I hit the power off button and it powers down and starts again immediately. Obviously it goes off when I power the PSU down but it is somewhat annoying. I have reinstalled the firmware in case of corruption but have not as yet done a full reset. Any ideas? 73 Ian __ 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
Re: [Elecraft] K3 power down problem
Mod done, still the same! Odd that it should just appear after all this time. 73 Ian -- Ian J Maude, G0VGS SysOp GB7MBC HB9DRV-9 DX Clusters Member RSGB, GQRP 9838, FISTS 14077 | K3 #455 http://www.amateurradiotraining.org 2009/11/10 Stewart stew...@baker.nildram.co.uk Hi Ian, Have a look at the KPA3 12V Sense Mod on the modification page. It maybe the answer to your prayers. 73 Stewart G3RXQ On Tue, 10 Nov 2009 10:49:03 +, Ian Maude wrote: Hi all, For some reason my K3 will not switch off this morning. I hit the power off button and it powers down and starts again immediately. Obviously it goes off when I power the PSU down but it is somewhat annoying. I have reinstalled the firmware in case of corruption but have not as yet done a full reset. Any ideas? 73 Ian __ 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
Re: [Elecraft] K3 power down problem
Ian, It sounds like something is activating the Remote Power On. Do you have anything plugged into the ACC connector? Check it to see if pin 8 is being shorted to ground. 73, Don W3FPR Ian Maude wrote: Mod done, still the same! Odd that it should just appear after all this time. 73 Ian __ 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
Re: [Elecraft] K3 power down problem
No, nothing plugged in there. 73 Ian 2009/11/10 Don Wilhelm w3...@embarqmail.com Ian, It sounds like something is activating the Remote Power On. Do you have anything plugged into the ACC connector? Check it to see if pin 8 is being shorted to ground. 73, Don W3FPR Ian Maude wrote: Mod done, still the same! Odd that it should just appear after all this time. 73 Ian __ 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
Re: [Elecraft] K3 power down problem
Yep as per my thread, I did it but still the same issue. I cannot imagine that was the issue though on #455 after all this time. 73 Ian 2009/11/10 Greg - AB7R a...@cablespeed.com This is the mod description from the website: This modification adds a diode to the KPA3 12V sense circuit to hold the voltage to no more than 0.6V when the K3 is turned off. Without it, some K3s refuse to turn off when the POWER button is tapped because the 12V sense circuit does not drop to a low enough level to shut down the K3’s MCU. The diode is a common leaded part. No work with SMDs is required. A minimum of disassembly is required and no boards need be removed to perform this modification. - 73, Greg - AB7R Whidbey Island WA NA-065 On Tue Nov 10 2:49 , Ian Maude i...@gb7mbc.net sent: Hi all, For some reason my K3 will not switch off this morning. I hit the power off button and it powers down and starts again immediately. Obviously it goes off when I power the PSU down but it is somewhat annoying. I have reinstalled the firmware in case of corruption but have not as yet done a full reset. Any ideas? 73 Ian -- Ian J Maude, G0VGS SysOp GB7MBC HB9DRV-9 DX Clusters Member RSGB, GQRP 9838, FISTS 14077 | K3 #455 http://www.amateurradiotraining.org __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: Elecraft@mailman.qth.net','','','')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
Re: [Elecraft] K3 power down problem
I had one of my K3's develop a similar fault. In my case it was a failure of Q2 (FDS6375, RF board) which is the power switching FET. elecraft spares sent me out one and I had it in a few days An IRF7416QPBF might be a junkbox replacement if you are very impatient! it's pretty easy to get at On Tue, 2009-11-10 at 13:05 +, Ian Maude wrote: Mod done, still the same! Odd that it should just appear after all this time. 73 Ian -- 73 Brendan EI6IZ __ 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
