Question about Audio Players & Recorders

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My Eurodesk MX8000 started having problems when powering up. The whole board would light up red & green ( peak, -20 & master solo), but it would successfully power up after a few attempts, I thought it might be the switch. The other day, after a many hour session, the board was still powered up but not in use, there was a loud crashing sound and the whole board lit up red & green. I've read about similar problems, Can you help diagnose?

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  • a_k_a_ken Apr 06, 2011

    I have both the power amp and mixer opened and I see no visual signs of a problem. The capacitors, fuses and the switch LOOK fine.

  • a_k_a_ken Apr 06, 2011

    I'm looking close all over and am not seeing any abnormality. I know the crashing sound indicates something blowing out but does that corelate to it happening occasionally at start-up? Is it possible that it is the switch even though it looks okay?

  • a_k_a_ken Apr 07, 2011

    This does not seem to be a signal path problem but a power sorce problem. I have to agree with SuperTech-11 with the exception that I don't see anything that looks improper. If something eventually blew, would there have been the occassional symptom prior to complete failure? And is it possible that could produce no visible sign? The board is clean and I don't see how dirty pods could cause this type of thing. Thank you.

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The first thing to check is the main out puts that is what will go first, and it will cause shut down problems, and if they are ok, then put new heartsick compound on the back of the out puts.

Posted on Apr 07, 2011

  • Veril Gillette
    Veril Gillette Apr 07, 2011

    If it is happy at start up,then check the power supply, electrolytic caps can look good and still be bad, also check the rectifier could be leaky and needs to be replaced, this is a common problem.

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Hi Ken,
If you have a contact cleaner, spray the switch, volume control and other potentiometer. This symptom may due to dirty contact of that parts...

Posted on Apr 07, 2011

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There's a good chance you have failing electrolytic capacitors probably in the power section.

Any caps that look bulged at the top, or bulged/leaking at the bottom need to be replaced.

That loud crash you heard was likely an electrolytic capacitor exploding, so that should be easy to spot!

If you are handy with a soldering iron an inexpensive handful of capacitors will likely fix you right up.
Match the capacitance on the capacitors. Go over voltage if you can, and still have them fit.
IE - it's not a bad idea to replace a 10V cap with a 16V or 25V or even a 50V, but don't replace a 680uF cap with a 500uF or a 1000uF (unless you are positive it's only doing ripple filtering, and even then, you should go OVER, not under the uF rating).

Most of the caps that go are 10V 1000uF or 3300uF.

A lot of incorrectly manufactured capacitors are ending their lives these days. They usually outlive the warranty, but not always, and not always by much - but depending on use, some lasted much longer than others, but inevitably failed within 1.5 - 3 years in most cases.

this issue spans plasma TVs, as well as large and small LCD TVs and monitors, amplifiers, mixing boards, PC motherboards, PC power supplies and many other devices - it's not specific to one company, brand etc.

The parts are cheap, and skill required is minimal - even if you don't know how to solder, there's a plethora of videos that you can find that will show basic soldering technique well enough that you'll be able to do this repair the day you watch such a video (assuming you have a soldering iron, desoldering braid or desoldering pump, and solder....flux isn't even necessary if you get a resin core solder)
Even a basic soldering kit at Radio Shack or The Source is cheap....much cheaper than replacing the MX8000 by a long shot!

Posted on Apr 06, 2011

  • Norman Skinner
    Norman Skinner Apr 06, 2011

    We're stilll looking for something that probably blew really bad, so look for very short wire looking leads where a component should be, and see is any regulators or transistors have part of their face missing.

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