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Earthquake mobile amplifier- fan overruns

The built in fan continues to run long after car has been turned off and amp is cool, any thoughts? I cant seem to find any info on this

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Re: Earthquake mobile amplifier- fan overruns

As far as I know, no amplifier runs the fan after the remote turn-on voltage is switched off. If the protection light it lit, the amplifier is probably damaged. If it's brand new, you should return it for repair or replacement.

Posted on Jan 08, 2008

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If the amp is off completley it sounds like the fan is running of the incoming 12Vdc line that is constant, not switched. That would be an issue with the amp manufacturer. There is a comparator circuit that uses a Thermistor that is RTVd to the power transistors heatsink block. When that voltage reaches it's reference voltage the fan will kick on. The amp manufacturer is switching the fan supply in with a relay to the 12Vdc line (more current capability) and the relay contact is stuck closed even when you turn the amp off. Does the fan run indefinitley or does it shut off over time?

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