Hi Folks,
I read this list on a reasonably regular basis, and I don't remember seeing
this problem. I have a old K2 (serial number 191) with SSB, KI02, and the
mod for bandwidth improvement on PSK 31. Along the way, a firmware upgrade was
installed. No, I'm not selling it!
The problem is with the KI02, the serial port adapter. It worked fine until
a few weeks ago. Today, as part of the troubleshooting project, I finally
got around to trying it with a second computer, and neither computer can read
the K2. No, it's not a program problem, as I tried the usual stuff, including
HRD, all of which worked previously. And yes, the cable has been opened and
checked at both ends. No loose connections. Yes, too, the "Port" is "on"
in the menu. This tells me the K2 can see it. However, when I tried to send
and receive data using Hyperterminal, a weird thing happened. Sending
"SW01;" turns off the port! According to my manual, this is supposed to change
bands, not turn the port off! This is repeatable, and happens with both
computers. Is this evidence of a damaged IC on the KI02? Note, I have a load,
clear oscillator signal at 16.29.
Suggestions? By the way, I have a vacuum desoldering machine, so removal
and replacement of defective through-hole ICs is trivial. Is that what I
need? A new chip? The schematic shows that the I/O is not buffered or
protected, so I am figuring that's what needs to be done? What say engineers?
72,
Preston Douglas WJ2V
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