[Elecraft] KPA500 MCU LOAD screen

[Bob McGraw K4TAX]

This would appear to be related to something connected to the amp either 
by the RS-232 port or the AUX port.   To verify if it is internal, 
disconnect one or the other or both.    Troubleshoot by progressive 
isolation, otherwise, one step at a time.   Be suspicious of anything 
which is or may be communicating with the amp.   If nothing is 
connected, an if the problem appears, it would likely be internal to the 
amp.  If it does not re-appear then it is something external.

While it is nice to have our stations fully automated and controllable, 
my motto is;  "more crap = more problems".   I suppose it is just how 
much crap one is willing to endure.   I prefer to keep my life simple 
and minimize issues.   Which says less crap = less problems.   Mine is 
connected to my K3S via the AUX communications port.   I've found that 
to be 100% reliable.  I also have a RS-232 to USB converter connected to 
the RS-232 {PC} port with no issues.

73

Bob, K4TAX



On 2/13/2020 9:04 AM, VO1HPFrank wrote:
> I came in the shack  yesterday and the KPA500 screen was lit with MCU LOAD
> message. I did not leave the amp on.  The amp was on when I arrived.  I
> updated the firmware to the current release.  This morning the same thing
> happened.  When MCU Load message is on the screen none of the front panel
> buttons are active including the POWER.  Have to unplug to reset.
>
> What is happening. ?   How can I clear this from happening?
>
> Frank VO1HP
>
>
>
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