How to connect two soundboards mackie - Mackie 1202vlz3 12 Channel Mixer

Hello, check if your Mackie, is with the latest Firmware update, you can get it on Mackie's official website
I sent you the Mackie technical support link
I hope you solve your concern
Greetings Franco Dosil

Hola, revisa si tu Mackie, esta con la ultima actualizacion de Firmware, puedes obtenerla en la pagina oficial de Mackie
Te envio el link del soporte tecnico de Mackie
Espero logres resolver tu inquietud
Saludos Franco Dosil
https://mackie.com/blog/support

Sounds like a problem with the horn amp in that cabinet. This is not a user fixable problem and needs to go to the shop. Here is a link to the Mackie support page where you can find a link to the repair shop list.
Mackie Tech Support

Why not un-complicate the circuits by eliminating the soundboard first?

I would spend some time with contact cleaner, apply it to the switch contacts of any 1/4 inch jacks, and all of the connectors to the effects boards- it will entail some disassembly. Check all chassis ground connections you may have one that is a bit loose, broken, or corroded.

The Mackie support downloads for manuals has 2 sections- you needed to look at the top at the "discontinued products" Where these are.

http://www.mackie.com/support/downloads/discontinued.html

http://www.mackie.com/pdf/cfx_om.pdf
http://www.mackie.com/pdf/cfxseries_ss.pdf
http://www.mackie.com/pdf/cfxseries_hu.pdf

http://www.mackie.com/de/pdf/CFXSeries_OM_German.pdf

You would connect at Aux outs of Mackie to inputs of Peavey

Try hooking your mixer up to your Mackies without the laptop. Does the hum go away? Try hooking your laptop output up to the Mackies without the mixer. Does the hum go away? Make sure that all your power cables run from the same outlet and have the ground or third pin intact on the plug. Also make sure that you are using shielded cables for any connection that carries an audio signal. This includes the cables going to your Mackies as they are powered amplified monitors. Make sure that the cables to your Mackies are balanced and haven't been altered to unbalanced. You will need to use unbalanced cables from your laptop unfortunately but try to find ones with a shield and three conductors ( right and left signals and a common or ground) that have a separate shield from the common. The shield should only be connected to common at the output of the device where the signal starts. A better explanation is at these links:http://www.epanorama.net/documents/groundloop/ also http://www.epanorama.net/documents/groundloop/cable_shielding.html

Decide if you want to use the AUX's or the SUB's for your monitors. (usually use the AUX).

Connect TRS cables from the appropriate AUX sends to thee amplifiers you use for your monitors or your powered monitors whichever you have.

Adjust the level using the AUX level controls for each channel to set your minitor mix.

Normally use the PreFader AUX's so monitor levels are set independent of the slide fader positions.

Here is a big hint for you: Search YouTube.com for "Soundboard" or "Soundboard setup". There are good videos there that might be different than your particular board, but there is enough commonality that you will soon be an expert!

Refer to your EV user manual, page 23, part 2.

You run the outputs of the Mackie into the stereo "returns" on the EV.

Use TRS interconnect cables as these are balanced lines.

Hi, first get a battery and a wire to comfirm if the speakers are still working.
If the speakers work that means one of your connecting cables is bad and it needs to be replaced.

You can just do a general troubleshooting of all the cable for connecting.

Good luck.

Are you sending the main mix to the monitors or are you giving them their own mix? What about using the sub groups, use 1 for your monitor send.