Chokes look fine but L4 and L5 aren't directly connected to line-in; they seem to be connected to the microphone in though. I took the KIO3 apart and traced the line-input circuit for continuity. The whole board looks good with no cold solder joints.
Anyway, I put everything back and voila... works like new. In fact, even better than before. I only need to set the input gain to about 10 to get a nice signal in from DM780 and registering about 5.5 to 6 bars ALC. This leads me to think two things; 1. Something was loose and my refitting the boards took care of it 2. There's still a cold solder somewhere that gets affected by heat I'll leave the rig on for a while and keep testing. I'm keeping my fingers crossed. 73 de James K2QI On Wed, Aug 5, 2009 at 9:10 PM, Joe Subich, W4TV <li...@subich.com> wrote: > > Check the RF chokes L4 and L5 on the KIO3 Audio IO board. > > 73, > > ... Joe, W4TV > > > > > > -----Original Message----- > > From: elecraft-boun...@mailman.qth.net > > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of James Sarte > > Sent: Wednesday, August 05, 2009 7:06 PM > > To: Elecraft > > Subject: [Elecraft] K3: Line-In dead (or heavily attenuated) > > > > > > I've sent an email over to Aptos hoping that they may know > > what's going on with my K3. A few days ago, I noticed that > > sometimes the amount of line-in gain required for a digital > > signal from DM780 varied quite a bit. Some days, all it took > > was a level of 14 and I'd have about 6 bars of ALC. On > > others, gain had to be set to nearly 25. Well, today it > > seems that my line-in died all together or at the very least > > has become heavily attenuated. I now have to crank the line > > gain all the way up to 60 to get about 3 bars ALC!! > > > > I have checked, and no audio settings have been changed on my > > PC. I even plugged in a set of speakers to the line out jack > > on the PC and everything is fine. What is weird is that > > sometimes, fiddling around with the mic/line input settings > > in the Main menu fixes things for a while, but then it's back > > to almost zero input after a while. > > > > Any suggestions? Lyle seems to think it could be a bad > > solder. I'm going to let the rig cool off and see if the > > problem occurs while cold. I've also reloaded the current > > firmware twice, plus went back to 3.19 just to make sure it > > wasn't a FW issue. > > > > -- > > 73 de James K2QI > > ______________________________________________________________ > > 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 > > -- 73 de James K2QI ______________________________________________________________ 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
