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: I am using the Yamaha
Unfortunately, I do not have a solution for you. However, I recommend calling Yamaha, as they should be able to help you troubleshoot the problem.
SOURCE: I have a Pmp5000 889406987784
Usual problem is the Channel A amplifier has burned and blown the switching transistors. Usually an internal board arc occurs and unless very skilled at board work of clearing the burned area and replacing the components you are better to replace the HCA2400 amplifier module... about $160
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