Re: uBITX woes, feeling disheartened. #ubitx
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If you look at the schematic you can see that D7 is directly across the windings of relay K1. The cathode
end is connected directly to +12V. The other end is connected to the collector of Q15. If you do not have
+12V at the cathode of D7 you should check for +12V on pin-1 of your power plug. If no +12V there you
may not have the power supply ON or it is not connected to the power plug. Scroll down for more
If you have +12V at the power plug but not +12V at the cathode of D7 you should trace the +12V from
power plug to the cathode of D7 by following the +12V through your power switch and back to the
+12V connection (RED wire) which is on P1 on your uBITX main circuit board. At P1 the red wire
should have +12V. With the PCB disconnected from power and the Raduino board unplugged you
can measure continuity from the RED wire (+12V) on P1 to the cathode of D7.
Connecting +12V to your uBITX is a bit complex if you are not used to following schematic drawings
and doing a little circuit tracing as you go.
This excerpt is from the uBITX Wire up instructions on the web page:
It might be easier if this section of the Wire up instructions said something like this:
This may, or may not, help.
On Sun, Feb 4, 2018 at 2:16 PM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
Read this old post, you should be able to follow along with your vom: