Found the problem! As many would guess - it's a solder problem! A tiny splash of solder in a random location shorted one of the remote control lines to ground!
73, Randy, KS4L On Thu, Apr 11, 2019, 9:05 PM Randy Moore <[email protected]> wrote: > Just completed an Elecraft T1 ATU. I built and used one several years ago > and wished I hadn’t sold it, so built another one. But it’s not working. > When I plug-in the (tested good) 9v battery, the yellow LED blinks 4 times > (not mentioned in the manual that I can see), but there’s no response to > any other button pushes. I went back through all the tests in the assembly > manual and they are AOK. I followed the voltage source through the 6v > regulator and that’s ok, although the regulator output reads 5.0v on my > DMM. Is that too low? > > I will confess something. When I inserted the 28 pin MCU into its socket, > no matter how I tried, I could not get it in all the way. I’ve socketed > dozens of ICs and never had this happen before. The instructions insist on > getting it in so that the “shoulders” of the pins contact the socket. I was > about 1/16” short of that. So I clipped about that much off all the pins > and got the pin “shoulders” to contact the socket. I could not have gotten > the little control board to fully seat over the MCU without doing this. But > I may have ruined the MCU by doing this... > > Any help appreciated! > > 73, > Randy, KS4L ______________________________________________________________ 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
