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You might call mackie for a suggestion at 800-258-6883. Sometimes there may be older parts in stock at other Mackie distributers around the world. Here's a list of contact info Mackie International Distributors It doesn't hurt to ask and email is free!
I had good luck getting parts for various musical electronics out of Canada
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There are cables that bridge the sets of channels together. You MAY have a bad connection of one of these. The strips of channels I believe are in banks of 8 in the Mackie's. The cables should be accessable with removing the back of the unit.
If you have had a spill of liquid into the faders, then you know what the problem is and requires extensive work to replace faders. You could try putting a bit of CRC226 into the middle of the fader slots if the faders are noisy. You can get the CRC226 at the Home Depot in the electrical dept. Use ONLY this exact product.
If the faders have become noisy, they may be changing due to poor contact. Try putting a small amount of CRC226 in the center of the slot of each fader and then move fader knob to top and bottom. CRC226 is available in the electrical department of Home Depot in a small can with spout... about $2.70
Changing faders USUALLY involves removing all panel hardware so that circuit board can be removed to get at the fader. It is often a LOT of work with a boit of hazards along the way.
If the control is noisy I want you to try something before replacing the fader. Get a can of CRC226 available at Home Depot in the Electrical department... about $2.70 for a can. Using the included plastic spout tube, squirt a bit into the center of the control where the knob is. Work it back and forth and then put a little more in and test if it is better or fixed.
NEVER use DeOxit or Blue Shower in faders!!!!! It removes the lube that is required in the fader.
I don't know if you have a product there that is available here in Home Depot stores.
If you can find CRC226, using the spout put a small amount in your faders through the slot, including the dead ones. Do NOT use any product like DeOxit as it will wreck the faders as will WD40. Find CRC226 (there are other CRC products so make sure to get the right one) in the electrical department of Home Depot stores.
You MIGHT try putting a small bit of CRC226 into the fader for that channel if it might be the fader. CRC226 is available in the electrical dept of Home Depot in a small spray can with a tube spout. DO NOT use De-Oxit in the faders. Put the tube into the slot and give a SMALL shot and work the slider. This MIGHT fix your problem. Other than that it is ready to go to the shop.
Removing all the knobs from a section of the board where the bad fader is can be a hassle.and sometimes some of the nuts from jack or screws from some connectors.
You are probably better to order the part from Mackie to get the exact part. Most are made by ALPS and I get ones for some equipment from DigiKey.com or Mouser.com. However, it does take a bot o knowledge to get the correct part and sometimes requires cutting the shaft of one that is too long.
One MUST match the mounting holes, resistance value, length of throw AND the "taper". Yours will probably be a standard "Audio taper" for the main output.
You can purchase the channel faders directly from Mackie Service Dept., you can replace them yourself if you're good at soldering - HOWEVER, be advised that disassembling the unit to get at the faders to replace them will require a lot of time and patience if you've never done it before. If the faders are not moving smoothly, it's possible that the wrong type of cleaning spray was used on them and there's a possibility that they could stop moving and controlling sound.
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?
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