I have an Akai MG1214 12-Channel mixer/recorder. I am getting a loud hum that seems to be triggered by applying a patch cord to any of the master outputs and connecting the other end to the sound card of my computer (tried this with different cords and with two different computers with same result). I also tried to hook up my M-Box audio interface with the line in on channels 11 and 12 and the same thing happens. A red light (which never came on before) just to the left of the sync/track knob at the top of the console comes on when a patch is made. I also disconnected everything in the periphery to isolate the problem and cannot figure out where this is coming from or why it does from several sources. Thanks Stu

Check your cable again. Cables for patch panels are DIFFERENT. The tip on a patch cable is smaller in diameter and has a point on it. A 1/4 inch TRS cable's tip is larger and has a rounded tip. If you're sure of your cables, then replacing the jack in the mixer isn't so bad if you're handy with a soldering iron.

You say the clip light is always on, as the only clip lights on this mixer are on the effects channel and the master output and you do not say which is on there are a number of possibilities. You may have the effects turned up too far as this should not be showing, just maybe blinking, turn them down on efx2 on all strips as well as on the effects processor and see if this helps. If it does you may be able to find where the hum is coming from by gradually increasing each until you find it.

If you are getting the clip on the main mix master and you are not being deafened and the humming sound is coming from the speakers not the mixer you may have a subsonic signal getting into the mixer. Disconnect all inputs and if this cures it go through until you find where it is getting in and sort that.

If the humming is coming from the mixer it is possible that the smoothing caps on the PSU are dying, you do not say if you are getting normal sound as well as the humming from the mixer.

When asking for help please try to give as much information as possible

This normally happens when the carts are removed and the amp is up. Its called microphonic-ing. Cheers john. Styluscity.

You seem to have some feedback hum from somewhere. I would think it might be caused by a faulty connection somewhere.

One of the power supply voltages is bad... either a short or the regulator is blown. Follow my instructions for a previous poster:

http://www.fixya.com/support/t10013559-mackie_1604_vlz

Hello,

It doesn't seem like a typical "feedback" problem, as feeback is produced by over modulation between the amplifier and the source - usually a pickup or microphone. It may be your cables to your amplifier are bad, or the actual line out jack(s) may have gone bad. If it is more of a humming sound rather than feedback, that is most likely your issue. If you have additional patch cables, switch out the existing ones, and see if that ends it. If not, it is possibly the jack(s).

You have a headphone jack on the Behringer, though you did not say if the problem arises through the headphones or an external amplifier. If you get the noise in the headphones, when no patch cords or a mic is attached, then the problem you should look at is your headphones or the headphone jack. You can narrow the problem down by using an external ampifier and see if you still have the "feedback" sound. if not, it's in the headphones or headphone jack.

Please try and provide more information for this question if we are unable to track the problem with these suggestions. As we do try very hard to center in on customer's problems, we do ask to provide as much information as possible, so that we can facilitate your resonse more effeciently.

Thank you for using FixYa.

Check List :
CD Deck 1 to Channel 1 CD Input
CD Deck 2 to Channel 2 CD Input
Mixer booth output to AMP's AUX or CD input.
use the BOOTH rather than the MASTER
even if you think you've done all these checks, check them again.
trust me I've been a DJ for 15 years & wired up **** loads of systems & still manage to ******* the wiring now & again lol.
you mite need to run an earth from your mixer to your amp.
One more thing, just out of interest you don't happen to have an amp with surround sound do you?
because if you do then switch the effects completely off this should sort it.

e-mail [email protected]

Bad earth / failed capacitor on the PSU board. I sell replacements via ebay or can email a service manual for you to get fixed locally. Fluffcat1

use good brand contact cleaner from radio shack or other electronics store and apply spray in the slider of defective channel and move each slider up and down many times.by the way check cabels which feed bad channel for a good condition and test these channel with the good cabel of good channel to confirm that the trouble in channel itself.after all if it is hopeless pass the mixer to service center to fix it.

I sounds like a bad filter in the sudio supply circuit finally took out the sound output chip or the power supply that controls the sound circuit. its a soliud state set and there are no user replaceable parts inside this set. Unless you have had solid state repair experience, please be safe and call in a pro to assost you in this repair. good Luck ps Please rate this thread