Behringer MX9000 PSU
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Posted on Aug 17, 2007 12:06 pm
Molasar
Member Since: Aug 17, 2007
Hello folks,
Newbie to the forum here...
I purchased a Behringer Eurodesk MX9000 two months ago; awesome desk! I currently own a small studio which is being beefed-up weekly.
2 weeks ago, we were in the middle of a recording session and decided to take a small break. Went out to get a smoke and when we returned 10 minutes later, the MX9000 was dead. Only the lighted power switch of the PSU was still on. The PSU fan was dead too.
I was aware the MX9000 suffered PSU headaches, so I was not too surprised. I returned the PSU to the store and after 2 weeks, they told me the transformer was toast and it would require an additional 2 weeks parts and labor! I didn't quite believe them, so I'm currently arranging with them to get a new PSU (swap deal, since the mixer's purchase is recent.)
If memory serves me right, I never remembered the PSU getting hot; it was barely warm to the touch. One of our singers left her lyrics on top of the PSU when we went out for a smoke; maybe that was what fried it, but since it was never running hot, I sorta doubt it (but nevertheless, a possibility).
Anyways, someone mentioned on another post getting matched LM350T regulators... Are these the same type/rating as the factory standard regs fitted? If not, what regs can one fit which have a higher amp rating? Isn't an LM338T (5A, 7A peak) better?
I was wondering... anybody know of someone who offers some kinda modded MX9000 beefed-up board (with top-notch components) kit for the PSU? I mean, not like sending in your PSU board for an overhaul (because most of us have our PSU up and running), but instead buying another PSU beefed-up board as a kinda insurance so we don't live in constant fear of the MX9000 going legs up in the middle of a session? I would definitely pay for something like this.
Plus a board kit is simpler to ship than getting a whole new PSU (heavy and bulky), specially for folks who live a bit far away like myself (down in sunny Mexico).
A beefy PCB board kit could be easily swapped in for the current board in no time. I've seen the insides. Real simple.
Any ideas?
Thanks!
Mike
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Noize2uCzar of MidiAdministrator
Since: Apr 04, 2002
Aug 18, 2007 12:13 am Hey Molasar, I think it was Walt who had his PSU take a crap and had or did the repair. My 3282A uses the same PSU and runs about on average about 60 hours a week. I have not had any overheating issues at all with it.
My suggestion's are to have it in a fairly open rack, preferably on the bottom were it will be the coolest. I also have two small quiet fans that help move a bit of air as well.
But I do believe that the parts listed were recommended by someone who knew what the proper limits were for parts that could be swapped. I don't honestly know that the 338T's would be any better performance wise. Maybe a bit more life expectancy when running long hours.
I also have looked to see if anyone supplied a modded or rebuilt board for the unit and have not seen anything out there. If you have a competent shop near you it might be worth a check to see what they can do or recommend.
WaltChief Cook and Bottle WasherMember
Since: May 10, 2002
Aug 19, 2007 08:29 pm Ya, it was mine that poped the regulator. I am guessing that you have the right componant per a past post, I have forgotton to be honest. A higher amprage rating on the regulators might help if they also don't carry an additional draw. I didn't do a full circuit anaylsis to see what the associated componanats would be able to withstand. I simply picked up a matched set closest to the origional specs. Quite frankly it is the case of the psu that is the biggest problem. It has a rather small fan and vents from the top of the unit only. I've had my psu sitting out open air since with absolutely no problems. I elected not to go to a larger fan as I have a one room studio and 'quiet' is essential. It's a good board. They didn't use sealed pots so at 5 years old now I am going to have to do a little 'blowing out' so to speak. I've got a couple of scratchy pots now. The whole fix as I remember it was like a 10 spot and 15 minutes.
Aug 20, 2007 09:06 am Hello,
I got my PSU back this Friday; not a new one, but rather mine was fixed.
I popped it open and saw they actually changed the regs; I don't recall what the original regs were, but now it has Fairchilds in there, same type.
I have my PSU unracked, sitting atop a pro Panasonic SVHS. This deck isn't even on all the time, and it barely generates any kinda heat. Over it is a tiny thin client that takes up about half PSU; it does not obstruct the top vents.
The MX9000 is on only about 8-9 hours per week. See how long it runs without problems...
Mike
WaltChief Cook and Bottle WasherMember
Since: May 10, 2002
Aug 20, 2007 09:46 am It is a lot of board for the money for sure. I can see keeping cost down by using unsealed pots, but the regulator choice/cooling configuration is a bit of a dissipointement. Having said that; the unit has processed one whole lot of sound here with more than reasonable quality and few problems.
Aug 21, 2007 11:41 am I've been wanting to try this out, but haven't gotten to it yet; so I'll ask first:
Planning to purchase an Alesis ADAT HD24 recorder, who's inputs are taken from the MX9000 direct-outs and outputs go to B Mix Ins. All ok up to there. But...
I also have an Akai DR8 I wish to use as a subgroup/buss/submix recorder. I can use the subgroup outs on the MX9000 to feed the recorder, but what of the recorder outputs? Where do I feed those back into the mixer? I thought of using the expander input ports, since they are suppose to feed the busses. Would it work? Will it go into a feedback loop? Can I control the input signal levels (playback) from the recorder via the buss faders? i.e.: I can control the levels going to the recorder with the buss faders during record, but when I pop the recorder into play? Will the faders also work somewhat as like the channel faders when using B Mix?
Any ideas welcome.
Thanks!
Mike
Sep 13, 2007 11:13 am Hello all...
My PSU broke down 3 HOURS after it returned from warranty service!!!!
I found it was cap C17 apparently on the +18V area...
I will do a full recap with Panny caps, and also have purchased higher rated regs to replace the current ones...
I just hope the desk was not damaged...
Mike
WaltChief Cook and Bottle WasherMember
Since: May 10, 2002
Sep 13, 2007 10:11 pm Sorry there Molasar, I use the MX in conjunction with an HD24, but slave it off of Cubase 4 with midi time code. I use a Delta 1010 for most of my 'light' recording, but have never had to use more than 24 channels at the same time. I use the HD for mostly kits where I place 10 or so mics. Have never used the expansion ports.
