Sounds like C1 may be short circuit, jack J1 may have failed, or there could be a short somewhere between jack J1, the trace that runs along the RF board from J1 to J8 pin 18, or where the corresponding track on the control board runs to the MCU pin 30. There's not much to go wrong, so I'd suggest first check carefully for shorts/solder bridges, then try removing C1, and if it still fails then replace jack J1.
73, Matt VK2RQ > On 4 Jul 2014, at 6:35 am, <[email protected]> wrote: > > I’m hoping for some advice on where to start troubleshooting a problem that > started this afternoon. > > Before I start digging into the K2 perhaps someone on the list has had a > similar problem and can help save some time in troubleshooting and repair. > > Here is what I’m experiencing. > > While listening to cw on my K2 (s/n 2711, 15 W) the unit suddenly started > keying dots. I shut the unit down and removed the key but when I powered the > unit on the problem remained the same. > I shut the K2 off, removed the microphone so there was no microphone or key > attached, turned the unit back on and the problem is still there. > > Thanks in advance for any ideas on where to start. > > 73’s > Lars > KA4U > > > > > > > > > > --- > This email is free from viruses and malware because avast! Antivirus > protection is active. > http://www.avast.com > ______________________________________________________________ > 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]
