[Elecraft] KPA-500 Failure

[Dick Bingham]

Hello Rick (NK7I) and Andy (K3WYC) - Tnx replies

"Message: 17
Date: Wed, 24 Apr 2024 14:11:28 +0000
From: Andy Durbin <a.durbin at msn.com>
To: "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
Subject: [Elecraft]  KPA-500 Failure
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"With the OPER light GREEN and slowly increasing the RF drive level to the
amp, there is a point where an internal relay 'click' can be heard, the
50-watt LED on the top row of LEDs turns red and the FAULT light turns red."

All the KPA500 LED are single color.  The 50 W LED is either lit green or
not lit.  Did it appear to be red because of light leakage from the FAULT
LED?

Some quite detailed discussion of KPA500 failure modes on the groups.io
 forum:

https://groups.io/g/KPA500/topics

73,
Andy, k3wyc "
============================
IF I remember correctly, the entire top row of LEDs flashed red in color
when the failure happened.

After removing the top cover, the PA assy is visible but there appears to
be no easy way access it due to a large bolt connecting the round
transformer to the bottom plate. Will have to access the home-builder
manual to figure out how to inspect the PA assembly.

TU for the reply  --  Dick/w7wkr