Question about Pioneer DJm 400 Professional DJ Mixer

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Hi i have no power to my mixer, no lights come on! Its as if it has blown a fuse or sumthing. I have swapped power leads and still no luck. It has worked for over a yr now! Untill i plugged brand new krk monitors into it, and it worked fine for 3 mins then just cut out.

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Hopefully you powered your monitors from the SAME receeptacle as this device.

If one powers monitors at one end of a room from one receptacle and their mixer from the other end, due to noise spikes on the power lines, one can have one or the other damaged.

ALWAYS power connected equipment from the same receptacle source.

Your unit uses a 250ma fuse according to the schematics. Replace it with an identical type fuse. You have to open the unit and you will find it on the board in fuse clips. It is a glass type, easily seen and replaced.

NOTE: If it blows right away, take unit for repair.

This unit is very poorly grounded, much like consumer electronics so one needs to be careful what you connect to it.

Posted on Sep 13, 2010

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http://elektrotanya.com/behringer_ub-2222fx-pro.pdf/download.html

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No, that is NOT what the problem is.

The fuse protects the power supply. The power amps have failed. The usual cause is an arc between layers of the multi-layer circuit board. The labor to repair the power amp module is extensive. I have repaired several.

You can find new amp modules and I would purchase a new one and drop into your unit. The amp module is an HCA2400.

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Each side of the amp will likely take out 3 switching MOSFET transistors and often a Zener diode. Sometimes a low resistance metering resistor will be fried with smoky residue underneath the board. When this happens two small surface mounted resistors will be blown open. Great care has to be taken when insulating the board damage and replacement of the blown circuit traces.

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There will be about seven blown parts on the amp and a dozen on the power supply. To give you an idea of the extent, the WHOLESALE parts cost is roughly $50, including the main power supply switchers IGBT's which cost nearly $20 for the pair by themselves.

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BEHRINGER USA, Inc.
18912 North Creek Parkway, Suite 200
Bothell, WA 98011
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Fax: +1 425 673 7647

I just repaired a PMP3000.

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