[Elecraft] K2 - KPA100 RS232 interface repair

[K8AC]

I had been using an Elecraft USB/serial cable with my recently acquired K2
and the PC communications worked properly.  In debugging a software problem,
it was suggested that I try using a real serial port, which I did. 
Unfortunately, I was unaware that I wasn't supposed to use a standard RS232
cable.  So now, the K2's port won't work with the USB/serial cable either
and I assume that the interface in the KPA-100 was damaged.  I guess that U4
(MAX 1406) is a prime suspect for failure in this case.  Any suggestions?



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