Good move taking a rest and a glass of wine — it is important not to panic, as that can lead to doing something silly :)
If you were entering 10000, you would have been tapping the « 0 » key next the the VFO knob multiple times, and maybe the pressure has caused the front panel and control boards to come into contact and short out. As I remember, there was not a lot of clearance there, especially with the adapter board for the encoder. I’d be looking for possible shorts around there. Just a comment on your observations with F1 — if you are applying power and measure 0V on both sides of F1, then that suggests that F1 is not open circuit. It may indicate that diode D10 has gone high resistance and is dropping the 13.8V when the radio tries to draw current. -- 73 de Matt VK2RQ On 5 décembre 2015 at 2:56:47 PM, Dauer, Edward (eda...@law.du.edu) wrote: More on the defunct K2: I measured the DC voltage on both sides of F1, the self-resetting fuse. With the power switch “off” the voltage is 13.8. With it on, the voltage is essentially zero on both sides of F1. Measured the resistance to ground at the collector of Q7 - it’s about 2 ohms, not the >500 it should be. But that doesn’t mean that Q7 or Q8 is the culprit. A short anywhere on the DC line could cause that reading anywhere else, yes? So, what’s the best procedure to isolate the problem — I removed the KNB2 and the KAF2; no change. Tomorrow, in the cold gray light of dawn, I will pull the front panel board and the control board off the RF board, to see if that narrows it down. Tonight, I will just have another glass of wine. That should help. Anyone know if F1 has a reset time of just under a second? If so, then the “popping” noise may be F1 trying to reset itself. Which doesn’t help locate the downstream problem, of course. But it would strongly suggest a DC short somewhere rather than some configuration glitch, yes? Ted, KN1CBR ______________________________________________________________ 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 Message delivered to matt.vk...@gmail.com ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
