20 Most Recent Mackie ProFX 8 8-Channel Desktop Sound Reinforcement Mixer Questions & Answers

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)

Mackie ProFX 8... | Answered on Sep 20, 2019

Hello Redman, I sent you the link to download the service manual of model B112, it is quite similar
Check for possible false contacts
I hope you can solve the problem
Greetings Franco Dosil

Hola Redman, te envio el link para que descargues el service manual del modelo B112, es bastante similar
Revisa posibles falsos contactos
Espero puedas resolver el problema
Saludos Franco Dosil
https://elektrotanya.com/behringer_eurolive_b112d_sm.pdf/download.html http://www.uns.nu/pdf/Behringer_Speaker_B115D.pdf

Mackie Audio... | Answered on Jul 05, 2019

Sounds like an earthing problem , check your cables and make sure none of the cables have strands that could be shorting down to earth causing the buzz

Mackie Audio... | Answered on Jan 13, 2019

are you running a sub, daisy chained to it? are they connected to each, just have one, two, four? are you hooked up like in the pic?


Mackie Audio... | Answered on Jan 04, 2017


Mackie Audio... | Answered on Nov 09, 2016

Hi. Did you get diagnosis for this? Mine has developed the same fault...

Mackie Audio... | Answered on Aug 28, 2016

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