While performing the initial power on tests on my K2 S/N 7809, I noticed that the VFO knob/display tuning test produced a sluggish, intermittent, or no change in display when I turned the knob in either direction.
I proceeded to remove the two chassis screws securing the control board to the front panel board. This allowed the control board to relax and slightly fall away from the front panel board, toward the back of the radio, opening up the space between the front panel encoder board and the control board. The display was at once responsive to knob turning on all RATE settings. Next, I slipped a piece of paper between the encoder board and the control board, then reattached the control board to the front panel board with the chassis screws. The display continued to be properly responsive to knob movement. When I tugged on the paper to see how tight the fit was, it resisted being slipped from its position. It was fairly pinned down. Here is a photo of the control board backside taken at a glancing angle, showing the joints for J1 in the foreground, and the pins of the U6 socket behind that. The socket pins should probably be trimmed, which I did not anticipate. The other joints, while not necessarily overly beautiful, I'll also check for height. It's not clear to me which pins on the encoder board are shorting to which pins on the control board, but it seems clear that some are. https://photos.app.goo.gl/KDzlAixNghg2tmhy1 If after trimming the U6 socket pins the problem persists, I'll leave the paper slip in, but I don't feel great about it. The paper could fail on these sharp solder joints given vibration over long periods of time. Has anyone else had an experience like this where the front panel board meets the control board? I believe the manual talks warns about this condition. Thank you. Mark AE6RT -- Mark ______________________________________________________________ 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 Message delivered to [email protected]
