DJM 400 Keep going into over on the channel and the master volume

i'm having the same problem ... :/ anyone please! heelp!

The fader pot will need to be replaced. There is no way to glue or repair the tab.

Does it buzz through cans? (headphones). Try listening on headphones (turn off any amps and speakers) on cue to each channel you use and to the master output. is it stil there? if so it's an all round earthing fault. If it's all good through the cans (sorry...I mean headphones), try it with the amp/s on again. If the buzz is back it souds like the screen on the main audio output connecters has come off inside.
It's a quick fix, but if you have never used a solder iron, take to someone who has.

Please try a set of headphones. If it is balanced in the phones, then I suspect trouble might be in the muting circuits of the main output.

Next test is to verify the outputs using direct inputs to the CD input...

The only "fix" for this is to replace the power switch. The internal latch has broken. I have seen this a few times. You can get the part from Pioneer directly. Contact them and request the power switch for your specific model. They may also request the serial number as there were a few variants of this model.

Dan

Sounds like your master volume is turned up too much. The channel volume will make the squealing go away(caused by high gain and humbuckers). The best thing to do is dial in your favorite presets and change the channel volume to the correct level with the master volume where you usually keep it. I use my Spider Valve at master volume at about noon and the channel volume between nine o'clock and noon. Let me know if this does not solve the problem......

Use the stereo master outs from the DJM into the A and B Inputs of the EQ (you'll need 2 phono to Jack or 2 phono to XLR cables) then from the A and B Outputs of the EQ to the power amp/ speakers, etc (you'll need jack or XLR cables depending on what is powereing your speakers)

This may not be the correct solution, but have you checked the switches on the back of the DJM-400 to see if one output is set to "PHONO" mode?

could be a few things , what have you tried to trouble shoot the problem ?
My steps would be ;
check all leads (even if you KNOW u pluged them in)
check the gain is set corectly .
check the line phono slectors are set to what ever you have you leads pluged into on the back of the mixer ( there is 4 red and white RCA plugs , 2 for phono,2 for line CDJs shold be using line )
if you are using digital cables to conect your CDJs , on the back on the mixer there is a small switch marked "CD or digital" make sure that is sleceted "digital " . if ur not using digital cables make sure it is on "CD" .
the info iv put here is based on the DJM-800 so your mixer my not have some of these featers as iv never used a 400 . hope this helps dued . check out www.djtutor.com for more tricks and tips . Pratices'N'enjoy !