[Elecraft] K2 KPA100 overheating/erratic fan problem

[nu6n at yahoo.com]

Hello,

I wonder if anybody had similar problem.
When I “run” I get fan starting running after 10-15 minutes. However after another few minutes of running the fan will shuts down every time I press a key ( I am CW op). As a result the temperature of the PA goes higher and higher and at certain point the PA shuts down. If I check the temperature reading through temperature calibration in the menu I see that temperature reading jumping force and back with range of readings 10 - 20C. That kind of erratic temp reading continues even when temperature of the heatsink goes down. If let the trcv to cool (overnight) the temperature readings are stable with range of reading +- 1C.

I check soldering and mounting - if there were problem they were fixed. But no results so far. I also upgraded the PA a week ago and that did not have effect on the overheating.

Any input will be appreciated.

73, Arkady