20 Most Recent Pioneer DJm 400 Professional DJ Mixer Questions & Answers

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 !

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

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.

You do not need to replace anything, buy or have a stepdown transformerof at least 200 watts rating.Step-down transformer specs:220V input110V outputHowever , there are other DJM400 versions that have a built in 220Vinput. Have a tech to guide you.

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

you mean theres no sound cause if the mixer is plugged in channel 1 is on but not working make sure you have it switched to line/cd or phono and make sure everything is plugged in at all ends also if your turntables need to be grounded to the mixer do that as well

If the unit is run by a wall wart you need to look under the circuit board and check the connections of the power inlet to the circuit board

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.

You need to REPAIR the cause of it blowing before you worry about what size it is. Replacing it without repairing MAY damage additional components.

For 220 Volt service it appears to be 250ma for 120 it appears to be 400ma

Here is service manual:

http://elektrotanya.com/pioneer_djm-400.pdf/download.html

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...

If your CD player works hooked up to the DJ board, then try hooking the line out of the board into a auxiliary in or line in in or record in on your receiver using the appropriate cables.Try the CD in first and if there is too much signal then use the CD/Tape in. You need to match the output signal of your board to the input signal of your amp. Hope this helps.

IT MAY BE A DISC THAT THE MIXER CANNOT READ.

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.

Fuse is inside VERY near the input power connector. You are likely wasting time replacing it unless you find the cause why it blew.