[Elecraft] KPA1500 goes into firmware load

[Mike Cox]

Mine's done this since day one. Since it's in my shack, I just reload 
the firmware and go on. It seems to occur most often after a power 
outage on the 240 VAC line though I've seen it occur with normal 
turn-on/off and (very infrequently) while just sitting there idle. My 
power supply is normally always on and the amp powers up via the +12 
Volt sense driven by the K3. A couple of guys at Elecraft were working 
with me (before Covid) to resolve this problem but we never determined 
anything. I think they believed I was making this stuff up. It only 
happens every few weeks so is not a major annoyance but I surely would 
like to have it resolved. Incidentally, I normally run the amp via 
KPA1500 Remote connected via ethernet and seldom touch the front panel. 
The K3 is on a very heavy duty UPS so it never powers off except via 
it's front panel.

Good luck!,
Mike, AB9V


On 1/12/2021 14:13 PM, Gary Johnson wrote:
> We have a K3 and KPA1500 at a remote site. The KPA has 240V applied to it all the time, and actually turns on with the K3 via the Aux Bus. We use the remote control application via Ethernet. Works great. Occasionally, the amp won’t turn on, and when we investigate, it’s in the firmware load state. The KPA1500 Utility is then able to reload it via USB, and we’re operational again. Nothing on the computer should be accessing its USB port to cause it to go into that state. I have noticed that if we cycle the 240V power, sometimes that will put it in firmware load as well. Is there a common cause here?
>
> -Gary NA6O
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