[Elecraft] [T1] Newly assembled T1 inop

[Randy Moore]

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 <wrmoore47 at gmail.com> 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