KPA-500 no 478 - shut down when switched from stand-by to operate

[VK2IA]

Hi,

I bought a kit in October last year and only assembled it recently.
Assembly procedure is straight forward as described in manual.

The first thing I noticed was that the amp was not always amplifying
properly while the transceiver was in transmit mode. '*' sign was always
visible when transmitting, but it just didn't generate constant output.
At that time I put it aside for a while. I just got it back on my desk
again today to have a look at it.

Switching it on was ok, but when I switched it to 'operate' from
'stand-by', the amp immediately blacked out (first time this has
happened). The transceiver was on stand-by at that time, just pushed the
operate/stand-by button and it happened. Fuses are still ok, so
something else must have happened.

Would anybody have an idea where to start looking for the fault?
Thanks

-- 73 Bernd VK2IA
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[Barry Simpson]

Hi Bernd

Are you sure you didn't push the "On" button by mistake ?  The two are not
very far apart.

I have been using my KPA500 since September last year and have had no
problems.

73

Barry Simpson   VK2BJ

2012/2/10 Bernd Länger <[hidden email]>

> Hi,
>
> I bought a kit in October last year and only assembled it recently.
> Assembly procedure is straight forward as described in manual.
>
> The first thing I noticed was that the amp was not always amplifying
> properly while the transceiver was in transmit mode. '*' sign was always
> visible when transmitting, but it just didn't generate constant output.
> At that time I put it aside for a while. I just got it back on my desk
> again today to have a look at it.
>
> Switching it on was ok, but when I switched it to 'operate' from
> 'stand-by', the amp immediately blacked out (first time this has
> happened). The transceiver was on stand-by at that time, just pushed the
> operate/stand-by button and it happened. Fuses are still ok, so
> something else must have happened.
>
> Would anybody have an idea where to start looking for the fault?
> Thanks
>
> -- 73 Bernd VK2IA
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

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