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I have a Behringer ACX 1000 and I started having a hot smell, checked the fan and it was hardly turning. Assumed it was a bad fan but I checked the voltage coming out of the board and it is 42 volts when it is calling. Is that normal and if not, what is going on here? Thanks
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The fan speed is controlled by the temperature of the heatsinks. You may detect some "hot smell", but just what is getting hot? If the heat sinks are not getting real hot to the touch, then the fan won;t be going a mile a minute either. If they are getting quite hot, then we might have trouble with one of the 3886 amp ICs, or indeed the fan might be off duty. If some component is getting hot, the fan isn't designed to protest a resistor. Is the amp working well and sounding OK? If there were some major overload on one of the 15v rails, the regulator could get hot. But in a case like that, I'd expect the amp to sound bad.Education is what you're left with after you have forgotten what you have learned. -
The amp runs perfect. The concern I have is the 42 volts going to the fan. IDK what it is supposed to be getting and I do not have the original fan. It was discarded, gah! So now I do not know what voltage fan to put in it and I have never heard of a 42 volt fan. I turn on the amp and no power is headed to the fan, obviously. I play for a bit and then the board calls for the fan and i get the 42 volts.Comment
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It is not a 42v fan. One side of the fan is connected to 42v, the other side to a transistor drive circuit. The transistor turns on sufficient for the fan's needs. Much like an LED running off a 15v circuit, the LED is not a 15v part.
The original fan was a 24v type. 80mm on a side I think.Education is what you're left with after you have forgotten what you have learned.Comment
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Thank you Enzo...Thats what I needed.Comment
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