Question about Mackie ProFX 8 8-Channel Desktop Sound Reinforcement Mixer

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My Mackie Pro FX8 starts blinking (All the lights) and popping through the speakers for no reason randomly. I can't trust it for shows ever now. Anyone have this happen too?

It pops and blinks randomly.

Posted by Anonymous on


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I had the same issue and the solution was to exchange all electrolytic capacitors in the power supply. The used "Jamicon" capacitors were all way below their expected values. However the most important capacitor to change is located just next to the switchmode transformer. It is covered with heatshrinkable tubing, so at first I didn't recognize it as a capacitor, and thus exhanging all capacitors on the secondary side helped, the issue didn't go away for good - it still sometimes blinked during startup. This capacitor (10uF/50V) looks like it smoothes a DC voltage to the SMP controller. The ripple voltage across it was substantial and desoldered, it showed som 3.3uF instead of the 10uF it was supposed. Changing it to a new 10uF/50V solved the blinking issue for good.
(I'm aware that the question is old, but I answered it so that new folks with the issue might find this answer when "googling" for aswers)

Posted on Jun 30, 2016

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  • Carlos Gustavo Sposaro
    Carlos Gustavo Sposaro Sep 10, 2019

    Hi Knud,

    I have de some problem in my Mackie, find help on internet and found your comment. I have basic know of electronic, so i will try with your solution.
    Thanks a lot for shared.

    Carlos from Argentina.

  • Jijo Tomy
    Jijo Tomy Sep 20, 2019

    I have the same problem in my barely out-of-warranty ProFX12v2. Mackie has no tech support in India, unfortunately. Thank you for your note.

  • Knud Pedersen
    Knud Pedersen Sep 20, 2019

    You're welcome - glad to help :-)


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It sounds like a problem in the effects processor but I am not sure but that would be a starting point.

Posted on Dec 09, 2014


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Posted on Jan 02, 2017

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