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Behringer eurodesk mx8000 schematic:- Was working fine for live show. 3 lines/3 microphones, only 1 in phantom - suddenly all green signal lights on but not output. Turned power supply off then on and it worked...5 mins and then same problem again. Now, without anything connected to the console, the channels 2, 4, 10, 15 and 19 have a green light...without anything connected. Please provide the full schematics for our electronic experts, who can investigate. (Purchased from UK, based now in Greece) Regards Heather

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SOURCE: When it's turned on, the light on my monitor doesnt show any signal of power supply

I'm assuming that you mean the green indicator light is not on. This could be caused by a host of problems. Assuming that you know the AC receptacle is live by testing with a standard light the next step would be to unplug the unit and remove the back. Check the fuse for continuity. If the fuse is good you have a problem with the power supply or a short which is keeping the power supply from powering up. The most likely culprit is the Horizontal Output Transistor. Unless you are an electronic tech and know how to check this you probably need to take the unit to a shop for further diagnostics and repair.

Posted on Jun 22, 2006

ThaMp3Doctor
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First, make sure the hold switch is off
Then, Push the hold switch in the direction of
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Press and briefly hold the user and play/power
buttons at the same time to
reset the system.

Then, upgrade the firmware - b/c plugging it into a Linux system cause the DB to become corrupt

Finally, go to the Linux forums, b/c this player was definitely NOT designed for Linux, and you will never get an answer in this section

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Benimur
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SOURCE: no output from power supply

Hi,

I am assuming that you are very familiar with electronic circuitry and components, use of a DVM and a soldering iron. In the absence of a schematic diagram, and since you have perform initial voltage checks, perhaps you can wing it. Your "brick" will have to follow the basic design of an SMPS (switch mode power supply). Simply stated,an SMPS is an AC to DC to high freq AC then to lo V DC converter. Per your post, you have checked that there is DC (B+) from the AC mains, then what is needed is to check if there is oscillation to produce the high freq AC. Often design calls for an optical coupler, a small rectangular looking component with four pins, two at each end. This is nothing more than a LED and a Light Dependent transistor. Its function is to switch/trigger on the oscillation (and therefore start the SMPS producing the lo B+s).

Again, since there is no readily available schematic diagram, might I suggest that you post back the part numbers of the ICs and transistors. What we can do is pull out their spec/data sheets and/or application diagrams. Such would give us a general idea of the working voltages at what pins and what each component is supposed to do. Example, let us say your power supply uses a 817A/0635 opti coupler and/or an SG5841DZ controller IC, then we can search for them as initially described.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Sep 30, 2008

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