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Re: cooling fan makeing noise
Try cleaning the fan first, if it still complains, you can get one from here. Just enter the details about the fan you have, voltage, diameter, etc, and they are sure to have one that fits for you. Farnell are in most countries of the world, so before you order it, be sure you are on a Farnell site in your country. Thanks for using FixYa, a FixYa vote is a great reward for my time taken to help you out. Happy to answer any other questions you may have about it. Cheers
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First of all, I would need to know the make and model number, rather than guessing. Second question, why are you driving the amp into clipping, if that's what you mean? That will destroy tweeter and midrange drivers. Certainly, if you are driving it into clipping, the heatsinks have got to be hot, and I don't believe an external fan will cool the right places. If you can get back to me with more information, you can contact me at my website, audioserviceclinic.com, to inquire about a repair. Thank you.
The fan is probably thermally controlled. This is done so that there is no fan noise when the volume is low. Once there is sound coming through, if the output stage heats up enough, the fan is turned on. It sounds like one or more of the output transistors is experiencing thermal runaway. The buzzing sound is most likely due to protection circuitry. You would need a schematic and a voltmeter to check this at the very least. If you are not inclined to perform the repair yourself, I would suggest taking it to a local guitar shop that repairs equipment. The smaller shops might have a tech make an initial assessment on the spot, which is something that the big chains are unlikely to do.
If the fan is thermally controlled then either that channel is not heating up enough to turn the fan on or either the fan or thermal switch has malfunctioned. The first thing I would try is to swap the fans. If the problem moves with the fan, then the switch is the most likely culprit. The fans are probably termally controlled so that they are not energized when the volume is low to reduce background noise.
a computer fan won't help you cool the unit, and will make noise in the reverb. we always ran these with a house fan aimed at the back of it, if it was being driven. does it get hot without being used or ran at low volumes? if so it is time for new filter caps in the power supply, and maybe a new transistor set. if it doesn't then it is probably the thermistor sensor that's mounted on the heat sink, replace it anyway for the $2 cost, also make sure the inside is clean and never shine a stage light at it's black heatsink. I sandblasted the 2 heatsinks on mine and they run 20 degrees cooler.
The stagepas 300 has two fans. Both of them are known to go bad. you can order the two fans from yamaha, but they are very pricey for what they are. (unless your service tech like me :-)) The part numbers are AAX62021 and AAX62041.
make sure there is nothing within several inches of it to start off. if need be, use a small house fan pointed at the amp to help cool it, if all else fails and/or you don't want to hear the noise from the big fan; get a computer fan the same size as the one in the case. connect it in place of the fan that does not work(may have to cut/splice the wires). that should work. oh, check the voltage and whether the fan is AC or DC from the stereo. this makes a huge difference!!!! if the fan says "DC" DO NOT CONNECT AN AC FAN TO IT!!! the fan will short and BLOW UP!!!
Well ehy do you not put in 2 fans. 1 on the left and 1 on the right. Make the vents and build it in. You can use the standard size PC cooling fan. Just look for a 12 or 15 V supply and make sure to regulate it with an LA7812 Transistor, Very easy circuit. Will give you one if needed.