When recording, the left channel often starts misbehaving by cutting-out or dropping to very low volume and crackling. This is only occurring on the main bus, whereas the sub-outs, monitor out, and fx-send remain completely unaffected. It can be heard through the main outs and the control-room/phones output. The quick-fix to the problem is to knock the mixer on it's upper right side, and it seems to go away for a little while.
Left channel control pot dirty most likely. is there a slider type pot on channel? this would have to be cleaned with dustoff spray.
SOURCE: PEAVEY 6 CHANNEL MIXER (PV6) - Right Fader Crackles
its obvious that the fader in question needs replacing ..parts are available from www.peavey.com
SOURCE: No volume control with 2 faders on Mackie CR1604 mixer
If all other functions work for those channels, the most likely problem is the fader itself. These can fail and operate more like switches rather than faders. Without witnessing the behavior, I can not state that for sure. While these mixers are not the hardest to work on, they are time consuming. The faders can be purchased from Mackie directly. If you need to have this repaired, any shop that repairs audio gear should be able to erpair this for you. Where are you located?
Dan
SOURCE: crackling sound at quater volume, cuts out when turned up more
i know what wrong i had the same problem see this black thing in the middle breaks from too much vibration 
SOURCE: Marshall MG50 DFX, the volume knob OD channel crackles
Either the control is damaged (happens if they get hit) or it is possible the circuit board it is mounted on has broken solder OR worse, a crack near the control. The unit will require servicing. Parts are readily available.
SOURCE: you seem to be the
The MON faders ONLY control the output to the MON L and MON R jacks, NOT the split use of MAIN/MON outputs. You MIGHT try varying the MONO fader and see if it varies the MON part of the split output.
Best to use the unit as MAIN L and R to main speakers and use a stereo amp or POWERED monitors driven from the MON L and R jacks. With this, the MON faders will control your monitors as you would like them to.
ALSO make sure ALL equipment connected together is powered from teh same recepacle power system. Powering interconnected equipment from receptacles at opposite ends of the room is asking for damage due to ground bounce and faults.
PLEASE read my tip on here about a HAZARD of speaker polarity if you use Speakon to 1/4 inch cables.
Place your mixer in a location that will allow you to hear the sound coming from the speakers clearly. The best placement is opposite the speakers, centered between the left and right pair. Connect the power supply to your mixer.
Connect the female end of an XLR cable to a microphone. Run the other end of the cable to your mixing board. Plug the male end into the "Mic" port of an open channel. These channels provide the preamps that will shape the sound characteristics of the microphone signal, processing them for output. Repeat the process for each microphone in your rig
Connect one end of a balanced 1/4-inch cable to the left channel jack labeled "L" found on the "Main Out" panel. Connect another cable to the right channel jack with the "R" label. Connect the opposite end of each cable to the matching left and right inputs on you amplifier.
Power on your mixer and amplifier. Test each microphone connected to the mixer for output.
Adjust the volume of each microphone channel to create a balanced mix. Use the "EQ" knobs to shape the tone and cut out frequencies that are causing squeal and feedback.
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Doesn't appear to be the fader, because the fader can be adjusted without the problem arising.
I'm in China, so the repairing of sound equipment can be quite difficult. People here generally prefer to replace things with new products rather than repair. Finding someone qualified to do repairs properly is unlikely.
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