I have a Mackie 1604 vzl pro mixer. It has two weak channels and a non working channel. Could give some tips on what I should look for when open up the unit?

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

Lawrence Nentwig

• 14 Answers
• Posted on May 29, 2009

SOURCE: Ch. 10 does not work - Mackie 1604-VLZ PRO

Yes, the ribbon cable is the 1st thing I would check. You can check the ribbon like this: Disconnect said cable from the channels. Connect cable connector from a known good channel to the problem channel. If channel sounds the same trace a signal through the channel op-amps.

SOURCE: mackie cr 1604 clip light stays on constantly

Is the PFL button stuck down on these two channels ?

Jacques Marin

• 566 Answers
• Posted on Jan 20, 2010

SOURCE: Mackie 1604 VLZ3 Issue.

Hi kielhunt
It sounds like power supply issues.
You may have bad capacitors and/or bad regulators.
If you have a multimeter you can get in there and check the dc voltages for ripple(ac voltage mixed with dc) or over/under voltages along the +/- 15volts lines.
Good luck

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SOURCE: My old CR1604 mackie mixer

If the hum is observable in headphones, then it is likely a power supply problem, usually a dried out electrolytic filter capacitor.