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All lights on mixer blink when it's turned on

All led lights just blink when mixer is turned on.

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Our mixture MACKIE CFX 20 give a humming sound as the clip light always on, but this does not happen before, tell me how to stop this


You say the clip light is always on, as the only clip lights on this mixer are on the effects channel and the master output and you do not say which is on there are a number of possibilities. You may have the effects turned up too far as this should not be showing, just maybe blinking, turn them down on efx2 on all strips as well as on the effects processor and see if this helps. If it does you may be able to find where the hum is coming from by gradually increasing each until you find it.

If you are getting the clip on the main mix master and you are not being deafened and the humming sound is coming from the speakers not the mixer you may have a subsonic signal getting into the mixer. Disconnect all inputs and if this cures it go through until you find where it is getting in and sort that.

If the humming is coming from the mixer it is possible that the smoothing caps on the PSU are dying, you do not say if you are getting normal sound as well as the humming from the mixer.

When asking for help please try to give as much information as possible

Sep 27, 2012 | Mackie cfx20 mkII compact mixer

1 Answer

Loose connection sx2442fx


If you don't want to send it back, the next option is to take it apart. If something sounds loose, then it usually is. Maybe you'll be lucky to have a loose cable you can just "plug in." It is quite a complex mixer by the look of it. I was looking for one, but I am unable to find a service manual for it. If I were there I would just take it apart and check for loose connections.

Jun 16, 2012 | Behringer Sx2442fx Eurodesk 24channel...

1 Answer

What is wrong with it?


FIlter capacitors in the positive supply are likely failing. These will be the larger metal cans- one may be bulging. Either way, one of them is shorting out after a certain voltage potential is achieved and causing your problem.

Replace the caps in both the positive and negative power supply sections and this should alleviate the issue. Match the working voltage rating, or even one step up in working voltage. yours are likely rated 25 volts, so a step to 35 volts would not pose an issue.

Apr 06, 2012 | Behringer MX9000 EURODESK 24 Channel In...

1 Answer

Crate csx24 sound board- the mute lights will not light. Sound works but lights will not light.


USUALLY the Mute LED's for the switches ar operated by separate contacts on the mute switch an a resistor current limit for the LED. I could NOT find the schematic for this board, HOWEVER some Soundcraft brand mixers do NOT have illuminated Mute switches... Not sure about your particular unit.

Aug 04, 2011 | Soundcraft Efx12 - 12 Channel Sound Board...

1 Answer

On my Behringer UB1202 mixing board none of the inputs work. I plug headphones into the headphone jack to monitor. Neither dynamic nor condenser microphones work (with phantom power enabled when...


Does your computer Recognize the mixer. and to answer your question honestly Behringer is Junk they make cheap knock offs of really expensive products. but see if your computer recognizes it and if not i sugguest taking it back

May 13, 2011 | Behringer XENYX 1202 Premium 12-Input...

1 Answer

All channels are clipping after water spilled on mixer.


If power was NOT turned off immediately after the spill, it is likely electrolysis has eaten through one or more circuit trace(s). If power had been turned off right away and the unit dried it would have been OK. The unit will have to be taken to a shop and repaired. This could be an expensive repair.
If the mixer is working properly audio wise and only the clip LED's are lighting, the cost may be mostly labor to repair the circuit board damage.

Dec 21, 2010 | Mackie Cfx-16-mkii 16-channel Mixer With...

1 Answer

All lights flickering


This is likely a power supply problem...

Be very careful to use an isolation transfprmer when working on the supply in this as there are lethal voltages.

May 15, 2010 | Behringer Pmp3000 16 Channel Audio Mixer

1 Answer

Mic section, lights and filter section quit working


Sounds like it MIGHT be a power supply problem. Needs service!

Aug 27, 2009 | Allen & Heath Xone:92 DJ Mixer

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