[Elecraft] KPA-500 270V ERR

[Fred Jensen]

I think the 270 V circuit is DC bias for the PIN diodes in the TR-switch.

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 8/26/2021 10:32 AM, Chuck Chandler wrote:
> My KPA-500 has been running great for several years.  Recently I noticed it
> was making the occasional extra "click" or "thunk" upon powering up or
> down.  Usually it would "click" when powered up and again when powered
> down, but recently a few seconds after the first click there would be
> another one, maybe more of a thunk sound.
>
> This afternoon I turned it on and when I pushed the Operate/Standby button
> I got a fault light and the 270V ERR message on the display.  The menu HV
> option shows 68.4V, varying a bit, on my 240V line.  I put it on the bench
> and opened up the top cover.  There is a smell of overheated components,
> maybe burnt but more like too hot.
>
> I've submitted the contact form on the Elecraft support page.  Any
> suggestions?  For now, I'm running barefoot...
>
> 73 de Chuck, WS1L
>
>