[Elecraft] KPA 500 Fan Not Running

[Jack Brindle]

Check for two things -1)  nothing is jamming the fan so that it won’t turn, and 2) the fan is plugged into the power supply properly as described in the assembly manual.

When the KPA is powered off using the front panel switch, we discharge the power supply capacitors through the fans, which is why the fans will start up
at that time. If this is not happening, then the fan is not receiving power.

Check these two things and let me know what you find.

- Jack Brindle, W6FB
Elecraft Engineering

> On May 16, 2015, at 11:31 AM, paul ecker via Elecraft <elecraft at mailman.qth.net> wrote:
> 
> Having a KPA 500 fan problem I believe. Was running the amp during RTTY contest and experienced - a Hi Temp  hard fault. The case was very warm to the touch and the fan was not running. KPA Menu - Fan Ctl - is set to normal. So I let it cool down and then ran a test calling CQ a normal run rate (Amp putting out abt 200W) and watched temp climb and the fan does did not come on. When I shut the KPA off, the fan does not run. Does anyone know at what thresholds fan should start running ?  Is there some way to do a fan test?73 Paulkc2nyu
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