Technical WARNING for Behringer MX9000 Users

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Chief Cook and Bottle Washer
Member Since: May 10, 2002

Give that power supply a lot of room to breath! Just moved my PSU from a 12U rack to a 4U rack and fried the +17 Volt power regulator. Turns out the +/- 17V regulators are rated right at capacity and will overheat and fail if the PSU does not have a good amount of space to dispipate heat via the rear heat sink and small cooling fan. The fix is not expensive if you have the tools ($10.00 for a matched pair of regulators) but obviously down time and much more costly if you have to use a shop.

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Lost for words with all to say.
Contributor
Since: Sep 12, 2003


Apr 26, 2005 10:54 am

Good bit of info there for us that have a board with a =17 Volt regulator. Thanks Walt!

*PS - Now I need to move my board where I have it at home!

Chief Cook and Bottle Washer
Member
Since: May 10, 2002


Apr 26, 2005 11:15 am

Always glad to help. Hopefully this will save someone some down time. The up side is that Behringer used real standard off the shelf parts. I can see why they used the design to keep fan noise down and such. Just got to keep Junior Kool!

Czar of Midi
Administrator
Since: Apr 04, 2002


Apr 27, 2005 12:04 am

Hey Walt, my desk uses the same PSU as yours. I have kept mine on the bottom of the rack just for that reason. Its mounted right below the 900 watt Peavey and the Alesis referance amps. I do need to replace my back rack fans though. I think that is why I havent blown it up yet. That and the fact is is on the bottom.

I will add though that a regular good blowing out of the crap right from the front fan inlet will help as well. Just make sure and hold the fan blade if your gonna hit it hard with air so it doesnt spin that poor little fans bearings out.

Chief Cook and Bottle Washer
Member
Since: May 10, 2002


Apr 28, 2005 12:00 am

Good point. It threw me for a bit as it worked all winter in the small rack case with no problem. Of course there is the answer...'winter'. It was the first good warm day when the thing went belly up.

I am thinking now of just putting carrying handles in the rack ears of the unit and not using a rack case. It is plenty protected as is and doesn't look that bad.

Member
Since: Jan 08, 2004


Apr 28, 2005 11:51 am

Thanks for the heads up!

Hold 'Em Czar
Member
Since: Dec 30, 2004


Apr 28, 2005 11:58 am

that's why he's the secretary of insight!!!


Administrator
Since: Apr 03, 2002


Apr 28, 2005 12:01 pm

oh, and apparantly don't use it around a GEM series heat n' glow fireplace...dunno if anyone has heard the recall on those things, they like to blow up too...I just got a heat n' glow, thankfully, not that series.

Czar of Midi
Administrator
Since: Apr 04, 2002


Apr 30, 2005 01:27 am

Walt, I think to you must consider the rack mine is in is also a very huge 30 space flat to slant studio rack. It is very deep, with the bottom 6 spaces takin up by, (from bottom to top on the lower section) Behringer PSU, 900 watt amp, 500 watt amp. Then the rest of the rack is slanted and gets less deep as it goes up. So there is plenty of air flow even with just the fans on the units themselves running.

Member
Since: Oct 02, 2020


Oct 02, 2020 06:59 pm

Hey guys, has any body ever tried to scrap the guts to the 9000 PSU and replace them with discrete power supply bricks for the required voltages and also use two 17 volt bricks for the +17 and -17 by connecting the negative of one supply to the positive of the other supply and connecting a zero reference point (common) to the same point on the power supply so that the negative of the second power supply indicates -17 volts with reference to common?

Will this work...or catch fire?

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