Fred, In cases like yours, first step is to connect a dummy load to the K2 just in case it is trying to transmit - it is not good to enter transmit state without a load on the PA transistors. If it is a K2/100, remove the KPA100 and connect the dummy load to the BNC antenna jack on the lower rear panel.
First thing is to check the state of the 8T and 8R voltage rails. Those are easily checked at the anodes of D6 and D7. If D7 anode has 8 volts on it while D6 anode has zero volts, then the K2 is in a transmit state. If both D7 and D6 anodes have 8 volts present, power it only briefly while making further checks lest some components overheat. If both 8T and 8R are present, you need to check the state of the RX signal at the gate of control board Q4 as well as the TX signal at the gate of CB Q3 - one should be on (about 5 volts) while the other should be off (near zero volts). If both of these are on, the microprocessor was zapped with the power surge, but if only one is on, the problem is a shorted Q3 or Q4 on the control board. 73, Don W3FPR Fred Keller wrote: > I also just noticed that the power output transistors Q7 and Q8 are > getting warm when the power is on. I did not say before but, their > is no display or any other activity on the control board or front panel. > > Fred, KC9QQ > > ______________________________________________________________ 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
