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
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