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Message: <blockquote data-quote="dB-r" data-source="post: 6272700" data-attributes="member: 574699">The thermal sensor is screwed down to the heatsink.   It is a variable resistor.  When it get's hot, the internal resistance of it either goes up or down (cannot remember now) and when it reaches a certain resistance it triggers a small transistor to turn on, and when that transistor turns on it tells the main IC in the amp (KIA494 in that amp) to shutdown.  When shutdown occurs, pins 9 and 10 stop putting out the square wave drive signal to the power supply and the amps shuts down and the protect LED comes on.Black amps will heat up in the sun period.  We have to keep a competitor customer of mines amps in the shade during comps because they are mounted in the bed of the truck, exposed to direct sun, and just a few minutes of sitting in the sun (they are black) they are hot as hell to the touch.</blockquote>

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