Brent, In cases of lightning damage to the KPA100, I normally just replace all the active devices (transistors, diodes and ICs) on the premise that if not damaged, they have been stressed and will fail later - I do not normally replace the KPA100 PA transistors because they are quite hardy.. The KAT100 does not usually endure damage other than the diodes in the wattmeter and usually the firmware IC, but you can't take my "usual" observations to heart with lightning damage. Most anything is suspect, so check it all out.
Look at the boards - If there is evidence of charring or burning, that area will have to be cleared of carbon and any damaged PC traces replaced with wire repairs. What I am saying is that it is less expensive and easier to assume that all active devices have been damaged and arbitrarily replace then than it is to try to debug exactly the failing component and then endure the frustration of an additional failure a few weeks later when a stressed component fails. Replacing all the ICs in the KPA100 and KAT100 is not really that expensive when compared with the alternative. 73, Don W3FPR On 8/29/2012 6:48 PM, Brent Sutphin wrote: > I now have the basic K2 working as it should after replacing the TX finial > and bias transistors. Now to move on to the KPA100. > > Brent > ----- Original Message ----- > From: "Brent Sutphin" <[email protected]> > To: <[email protected]> > Sent: Thursday, August 23, 2012 9:27 PM > Subject: [Elecraft] K2 Problems > > >> The symptoms I explained earlier were after an electrical storm >> that also took out my cable modem and wireless router. The K2 was >> connected >> to its antenna but was turned off at the time. It also had the KPA100 and >> KAT100 installed. I decided to remove the KPA100 and KAT100 to see if I >> still had the problem with the basic K2. I wanted to see if the high >> current warning was >> still there. The high current warning did not come on but the power >> transistors became very hot very quickly. I was not transmitting. That led >> me to believe >> that the power transistors were defective. There very well could be >> problems >> with the KPA100 as well. Now I'm not so sure. >> >> Brent >> WB4X >> >> ______________________________________________________________ >> 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 > ______________________________________________________________ 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
