[Elecraft] KPA500 fan won't shut off

[Eric Norris]

As Jack Brindle noted (and he would know), it appears to be a stuck relay.
If you don't want to send the amp back to the mothership, I'm sure Elecraft
Support could identify the relay, and if you can do rework, you could
remove the bad one and replace it yourself.

73 Eric WD6DBM

On Tue, Nov 26, 2019, 12:57 AM Grant VK5GR <vk5gr.radio at gmail.com> wrote:

> Eric,
>
>
>
> I reloaded the firmware tonight – no change (in fact I upgraded it from
> 1.47 to 1.54).
>
>
>
> If I plug the mains cable in the fans power up immediately. If I then turn
> the amplifier on, the amp works normally. When I power it off from software
> or the front panel the fans spin up and stay running.
>
>
>
> Is there something I can look at here in VK I wonder? I really don’t want
> to have to ship it back to Elecraft for this.
>
>
>
> Regards,
>
> Grant VK5GR
>
>
>
>
>
>
>
>
>
> *From:* Eric Norris [mailto:norrislawfirm2 at gmail.com]
> *Sent:* Tuesday, 26 November 2019 2:20 PM
> *To:* VK5GR
> *Cc:* elecraft at mailman qth. net
> *Subject:* Re: [Elecraft] KPA500 fan won't shut off
>
>
>
> Reload the firmware.
>
> 73 Eric WD6DBM
>
>
>
> On Mon, Nov 25, 2019, 6:51 PM VK5GR <vk5gr.radio at gmail.com> wrote:
>
> FAN CTL = NOR
>
> FANs are idle while the amp is turned on - amp ambient temp was 27C at the
> time (it was powered up and had been idle for about 20 minutes).
>
> I then turned the amplifier off via the front panel push button. I would
> have expected the FANs to start up for about 10 seconds as they discharge
> the 60V rail supply but instead the FANs continue to run. the only way to
> turn them off is to unplug the amp from the mains supply.
>
> It is definitely a fault condition and not a menu selection.
>
> Thoughts?
>
>
>
> --
> Sent from: http://elecraft.365791.n2.nabble.com/
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