Question about Pioneer DJm 400 Professional DJ Mixer

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My DJM 400 one of the outputs is louder and has distorted sound what do I do?

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First verify that one channel is bad by swapping the output leads and seeing the bad audio comes from the other speaker. Assuming it does, you probably have a bad output driver on one side.
This can happen if one powers part of the system from different receptacles in a venue and electrical disturbances destroy one or more audio interconnects. ALWAYS power ALL interconnected equipment from the same source, even if you have to run an extension cord between power amps and the mixer.
You will probably need to take the unit for repair. The parts cost should be nominal, however labor could cost a bit.
Find out is SAME distortion is present in the headphone output. The circuitry shows a bunch of muting transistors and one of them could be bad... but we can do some troubleshooting externally with testing at headphone jack, etc.

Posted on Oct 15, 2010

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1 Answer

Voltage djm 400


You do not need to replace anything, buy or have a stepdown transformer

of at least 200 watts rating.


Step-down transformer specs:

220V input

110V output


However , there are other DJM400 versions that have a built in 220V

input. Have a tech to guide you.

Oct 22, 2012 | Pioneer DJm 400 Professional DJ Mixer

2 Answers

I have a djm 400 and it has started producing a buzzing sound through the speakers. I can take the same speaker cables from the djm 400 and hook them up to my backup mixer and the buzzing goes away. What...


Since it works with your other mixer, the DJM400 is probably fine. You have a ground loop.

Make sure ALL, and I do mean ALL... (re-read that if there is any confusion) interconnected equipment WILL BE powered from the same receptacle or source. If speakers or amps are powered from one place and the DJM is from the other end of the room you likely have a ground loop and you can ex[ect buzzing. Run extension cords alongside the audio leads if necessaryy to carry power from where the amps or speakers are plugged in back to the DJM400 and ANY pther connected equipment.

Jan 07, 2011 | Pioneer DJm 400 Professional DJ Mixer

1 Answer

I have a djm 400 and it has started producing a buzzing sound through the speakers. I can take the same speaker cables from the djm 400 and hook them up to my backup mixer and the buzzing goes away. What...


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.

Jan 07, 2011 | Pioneer DJm 400 Professional DJ Mixer

1 Answer

Hi, I have a DJM 400 Pioneer mixer, I'm having trouble with the output levels. It seems the left output is only putting out about half the sound of the right output.I have used different RCA cables,...


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...

Dec 01, 2010 | Pioneer DJm 400 Professional DJ Mixer

1 Answer

I have a problem with my djm 400 pro mixer i can only get very low destorted sound with no leves on the meter and theres is a large hum in the back ground


This sounds like a failing power supply... Probably an electrolytic filter capacitor. Not an expensive part, just have to find someone to troubleshoot and replace defective part.

Dec 17, 2009 | Pioneer DJm 400 Professional DJ Mixer

2 Answers

How to connect my qqualizer to my djm pioneer 400 mixer


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)

May 27, 2009 | Pioneer DJm 400 Professional DJ Mixer

1 Answer

One Output low on DJM 400


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?

Apr 17, 2009 | Pioneer DJm 400 Professional DJ Mixer

1 Answer

Pioneer DJM-400 mixer turns on, but channels aren't working


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 !

Dec 28, 2008 | Pioneer DJm 400 Professional DJ Mixer

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