[Elecraft] KPA500 fan won't shut off

[Grant VK5GR]

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?



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