[Elecraft] [K2] 100w option fan control problem

[Robert G Strickland]

Don...

Setting the PA temp to room temp got things rolling. It was reading 30C 
when I got to it. No idea how that came about. Thanks much.

...robert

On 9/20/2019 19:07, Don Wilhelm wrote:
> Robert,
>
> Check the voltage at KPA100 U1 pins 11 and 12.  Then set the K2
> secondary menu to PA ON and tap DISPLAY.  You should see Fan NOR, Fan
> LO-HI, then Fan HI with subsequent taps.
>
> With FAN NOR and the KPA100 quite cool, both U1 pins 11 and 12 should be
> at 12 volts.  With FAN LO-HI, U1 pin 12 should go to near zero volts and
> the fan should run at low speed.  Pin 11 voltage will drop a bit, but
> should be higher than 5 volts.
> With FAN HI, the voltage at pin 11 should drop to near zero and the fan
> should go to high speed.
>
> Now if the fan did not start at the LO speed, put a resistor in parallel
> with R31 - I would suggest starting with 1k and then going to a lower
> value if it still does not start.  Some fans need a bit more current to
> start.
>
> After all that, put the fan back to NOR and then let the KPA100 and K2
> return to room temperature with no power on (about 1/2 hour).  Measure
> your room temperature and convert to degC if your thermometer does not
> have a C scale.  Turn the K2 on and do CAL PA TEMP - set the value at
> your room temperature in degC.
>
> 73,
> Don W3FPR
>
>
> On 9/20/2019 2:33 PM, Robert G Strickland via Elecraft wrote:
>> I cannot get the fan in the 100w module to spin at any setting of the
>> fan control option in PA/SEC/fan. I have not looked back there when
>> operating, so don't know if fan is spinning up when the amp starts to
>> get warm. Suggestions? Thanks.
>> ...robert
>

-- 
Robert G Strickland, PhD ABPH - KE2WY
rcrgs at verizon.net.usa
Syracuse, New York, USA