[Elecraft] Reversed connections from KIO2 to KAT100

[Don Wilhelm]

Gil,

Actually things may not be all that bad and you may find that the only 
components damaged are the KPA100 firmware chip and KPA100 U6.

However, you should be prepared with all the parts that Gary listed just 
in case.

Reversing the color sequence would have placed 12 volts on the KPA100 
VRFDET line which goes to U6 and would likely cause its early demise. 
The same combination would have placed the KPA100 12CTRL line onto the 
K2 VRFDET line, but there is no source in the KPA100 for the 12CTRL line 
and the K2 microprocessor may have survived.
Similarly the K2 8R line would have been placed onto the KPA100 AUXBUS 
line, and surely would have killed the KPA100 firmware chip, but going 
the other way and placing the 8R line from the KPA100 onto the K2 auxbus 
line may have caused no damage since there is no source in the KPA100 
for voltage on the 8R line.

Does the base K2 still work?  If so, you may have been fortunate.

73,
Don W3FPR

Gil Gibbs wrote:
>   I've hit a wall with one of the strangest situations, having simply 
> not taken time to recheck all my connections on the DB9 connector from 
> the KIO2 to the KAT100. I had the KIO2 pins reversed in color order, 
> from 6 to 9, plugged it in to smoke test the circuit to the KAT100, and 
> got "zero" results. When I checked with Gary, I was informed that some 
> seven parts, on three boards, have to be replaced, and I'm wondering if 
> anyone else has had this same miscue, can give me hints about what other 
> problems have been caused by the miswiring? I have to do a lot of major 
> surgery on the boards, and might have to realign the Control Board. Any 
> hints and kinks beyond the missives I've already gotten will be 
> appreciated. Murphy's Law strikes again, right at a critical time!!