Question about Mackie cfx20 mkII compact mixer

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Would you know how to correctly open a CFX20 to clean the pots?

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Yopu do NOT clean the pots... if you have noisy sliders, get some CRC226 at Home Depot in the electrical dept. Spray a small bit in the center of the slot for the slider and run the slider up and down. Use sparingly and apply a tiny amount once more. The sliders are NON_REPAIRABLE if this won't fix them and major disassembly is required involving removing the round knobs, fader knobs, screws and other nuts on the jacks. Hours of work. Pots require desoldering tool and use of soloder wick and plunger type removal tools often causes damage to the circuit board.

Posted on May 29, 2011

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1 Answer

I can't get sound


Please post some more detail of how each channel is set up and what you have assigned where. My guess is that reading the manual may sort your issues.

Jun 27, 2014 | Mackie cfx20 mkII compact mixer

1 Answer

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Hello,

It maybe the pots but i strongly recommend that first clean all back switches including the Bridge/Stereo switch which it has to be outwards to stereo listening, then let me know your results to help you out more.

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What makes you say it works fine if you are getting no output? Have you just got it turned down?

May 21, 2012 | Mackie cfx20 mkII compact mixer

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I own a Mackie CFX20. It isn't the MKII. The effects are very weak, and they buzz a little when you try to use them. How can I fix them, and is a service manual available?


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

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1 Answer

I have an opportunity to buy a cfx20 mixer from a guy for a really good price, but both the XLR and 1/4" jacks aren't working on one of the main outputs. I suspect it's the master slider, and...


If headphones have both sides working, it is NOT the main fader. It would most likey be the driver chip for the failed side that has been blown. This is common problem when people fail to power the mixer from the same receptacle or power conditioner that amps and other connected equipment are powered from. Ground bounce damages the circuits. The balanced outputs are driven by NJM4560 op amps which are likely surface mounted 8pin chips... .

Here is service manual:

http://elektrotanya.com/mackie_cfx20_sm.pdf/download.html

Scroll down to "get manual" and click on it to download. Ignore other download links for viewers.

Jul 12, 2011 | Mackie cfx20 mkII compact mixer

1 Answer

Aux pots severely bent but not broken off.


Shafts will SURELY break if you try to straighten them. Replacing these requires labor of removing a lot of knobs and screws... cost of the pots is minimal.

Jun 21, 2011 | Mackie cfx20 mkII compact mixer

1 Answer

Have a mackie cfx20 and i'm only geting signal on rightside


Make sure the PAN knobs are centered...

Also you can do a lot of troubleshooting with headphones in monitor jacks, etc.

Remember to use BALANCED lines out of the mixer which are either XLR or TRS type cables.

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I need to know the value pots to buy for vol,bass


If you have the old pots look on the edge of the cans (metal backs) for the code. Take them to a good electronics supplier and they can match them or measure the resistance from each outside pin with all pins free of interconnection. You will also need to know the audio tapers. The supplier should be able to tell from the codes.

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