[Elecraft] Reversed connections from KIO2 to KAT100

[Stuart Rohre]

Gil, a good technique is to make a copy of the schematic, maybe even with 
magnification, to see more easily where the leads of the connector go, (to 
which components).  Then, with a colored pencil, trace out each pin to what 
it is connected to (component), and evaluate what the reversed voltage 
situation was, and then, if it could have failed the component connected to 
the pin.

For example, consider that a capacitor might be connected to the pin you are 
tracing.  If it is a ceramic disk, it is not polarity sensitive and likely 
would also be rated at a voltage high enough to withstand anything 
mis-connected to it.

But, if the capacitor had been electrolytic, and the wiring problem placed a 
negative voltage on the positive side of  the capacitor, you likely would 
want to change it, in case it has been compromised or stressed, even if it 
is not showing short or open at this time.   In a like manner, you can find 
what active components, (transistors or ICs) might need to be swapped if 
they endured reversed voltages, or overvoltage, such as an input being 
connected to a DC bus voltage.

GL and 73,
Stuart
K5KVH