Hey List,
For completeness I thought I'd post the final on my earlier problem
with my KPA/K2.
The cause seems to have been something like this:
Storms in the area, I unhook everything religiously, only I forgot
PC-->K2 serial, which went through a USB--Serial dongle.
I return to shack sometime later to discover the K2 is unhappy with
080 error. Further investigation reveals that if I remove the KPA
K2 is happy and runs at 15w without fault.
Post to the list wherein I'm given tips by W3FPR and many others.
Ultimately solution is to replace KPA MCU.
Several mails were exchanged with Gary @ Elecraft to ensure that I
had all the potential fault parts coming (by this time I realized I
had cooked things via the PC remaining connected to the rig).
The end failures seemed to have been the MAX1406 and the KPA MCU.
Replacement of both of these brought everything back happily, and
happily no damage to the KAT that was also connected. I'm pleased
that I didn't have to go too far, but, the N0SS guide (directed to me
by Gary) for troubleshooting the use of the wrong serial cable was
helpful in tracing the circuit back, as well as the following
provided by Don:
"An easy way to check things on the K2 side of the MAX 1406 chip is
to plug the KPA100 ribbon cable into the K2 and check for continuity
between KPA100 U4 pin 12 and K2 Control board U6 pin 25 - also check
the RXD path KPA100 U4 pin 11 to K2 CB U6 pin 26. Both these paths
must show low resistance for the computer port to work."
Oddly, on the PC side; no faults seem to exist (the machine didn't
even crash or reboot) save the loss of 1 USB port, and the USB--
>Serial dongle.
My post is mostly to give some praise to the folks that took some
time to help me out, and, to end up in the archives so that others
may benefit.
Gary and Don, thanks a lot guys. Your help was greatly appreciated.
Sorry this is so long in coming.
73,
Joe KC0VKN
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