[Elecraft] KPA500 failure
Lyn Norstad
Lyn at LNAINC.com
Thu Feb 9 10:56:34 EST 2023
Here's another twist that makes me thing it could be a PS issue.
Early this morning, I was hunting down 3Y0J on 10m FT8 (very strong signal
here). WSJT-X was in F/H and S/P mode. I stepped out of the shack for a
few minutes, and when I came back the KAP500 was powered ON, in Standby mode
with the Fault LED lit up. It had been powered Off with the front panel
switch since yesterday (the rear panel switch was ON as usual).
How is that possible?
Thx,
Lyn
-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Lyn Norstad
Sent: Wednesday, February 08, 2023 4:00 PM
To: Elecraft at mailman.qth.net
Subject: [Elecraft] KPA500 failure
A couple days ago, I stepped out of the shack for a few minutes and upon
returning found the KPA500 had shut down. I didnt note any brief power
outage, and Im quite sure it was ON when I stepped away.
It has been a little quirky in keying since that time. Yesterday it gave
off a funny smell and the Power and SWR LEDs were jumping up and down for no
apparent reason. The display screen jumps to frequency readout when I key
the exciter, no matter what it is set for.
The KAT500 seems to be working normally with the amp either OFF or in
Standby.
I did a total power reset and reloaded the current firmware (v01.54), but no
change.
I have not pulled it apart yet, but I seem to remember these being the
symptoms discussed some time ago that required an LPF rebuild. Somewhere
along the line, Elecraft switched to a SM board and thats when the trouble
started.
So my question
besides asking for general advice
is if anyone knows the
serial number when Elecraft made that change. My KPA500 is s/n 03835.
Thanks!
73
Lyn, WØLEN
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