Guido, I had a similar problem with a HiCurr a couple years back working on a friends K2. The problem turned out to be R67, a 2% tolerance (blue) resister that controls feed back to the RF power control; which was burned for some reason. I replaced it and fixed the problem. If the noise blanker is installed this resistor will be hard to see because it sits under it. I did not have a problem with increasing current, but it is worth a quick look just to make sure this is not the problem.
Best of luck! 73, Kevin KG4TEI On Mon, Jul 12, 2010 at 4:28 AM, Guido Tedeschi <[email protected]> wrote: > A friend asked to me to repair his K2 10W which has a strange problem: > too high current in TX (1.2A even with 0.5W) and current that > increases during key-down until HiCurr protection. > Already changed the 2 x 2SC1969 PA transistors and re-winded the > output transformer, but nothing changed: the voltages on PA and driver > seem OK, the power from driver and the power output remain stable > during key-down, but the current increases... > What could be the issue? > Before spending more time on troubleshooting, has someone had and > solved the same problem? > Thanks and 73 > Guido, ik2bcp > ______________________________________________________________ > 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 > ______________________________________________________________ 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
