My trusty old K3, SN 123 in operation almost daily since late 2007, and has
performed almost flawlessly since. It has been updated regularly with most
options and could be considered “almost K3S”. It has been back to the
mothership once about 10 years ago for a quick fix due to  lightning ESD.

Recently though when changing modes from CW to USB/LSB or from DATA to AM
it hangs in transmit. A quick press of the “XMIT” button clears the problem
and it operates normally after. It doesn’t hang on any other mode switches
but if I change bands from a band on CW to a band on USB/LSB it will hang.
On two occasions going from DATA to AM it froze completely and wouldn’t
respond to any button and had to be powered off at the power supply.

Here’s what I have tried so far:

1. Since the “gold pin” mod hasn’t been done, I pulled the front panel,
cleaned all the pins and replaced it. No change.

2. After it froze completely the second time, I forced an EEINIT, reloaded
a good configuration. No change.

So it appears to be a hardware problem. I haven’t contacted Elecraft yet
because they seem to be in flux right now due to COVID and the push to get
the K4 out the door. Plus, I do have a quick work-around as long as I avoid
the total freeze.

So if anyone has had a similar problem and solution or could tell me where
to look I would appreciate it.
Thanks,
Don, K5DW
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