Question about Behringer DJx700 5-Channel Pro DJ Mixer with Digital Effects & Bpm Counter

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Djx 750 - no power - transformer dead?

Behringer DJX 750 dead. No lights... nothing happens when power switch is on. Fuse ok. Primary voltage at transformer ok. No voltage on any of the wires on the secondary side. Primary side infinite Ohm. I assume the transformer is the root cause? What voltage should be on the secondary side for the orange an the yellow wires? What is the function of the brown wire? Thx for help.

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  • Uwe Zugschwerdt
    Uwe Zugschwerdt Feb 16, 2014

    Hmm found Cap c21 104 M burnt black. So I guess this is the root cause which killed the transformer get killed as well?

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Actually, you may be in luck. A burned cap means that it has done exactly what it's supposed to do. So...you might stick an identical one in there -- it's a 0.1 uF cap, and you can find these at Radio Shack (0.1 uF 50V) or online. They are cheap, so give it a shot.

Posted on Apr 13, 2014

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Posted on Jan 02, 2017

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SOURCE: i replaced the transformer and

Transformers rarely fail... you wasted money on that... Likely one of the rectifier diodes/module or filter caps has shorted. Continued use will burn out the transformer. It is humming because it is overloaded with failing components.

Posted on Jul 04, 2011

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SOURCE: my effects on the behringer djx 700 dj mixer stop working how

This is a wild educated guess.

I repaired a Behringer guitar amp that had a DSP effects in it (BX1200 I believe).

The effects were on a seperate board and the board had its own 5 volt power supply. The filter capacitor for the 5 volt power on the board was UNDERSIZED and it had degraded causing the 5 volts to drop out of regulation, dipping to 4 volts. This caused the DSP effects to fail.

YOUR device MAY use the same DSP OR design.

Check the 5 volt power with an OSCILLOSCOPE to look for dips below the 5 volt operating point that occur at 120 HZ.

Posted on Oct 24, 2009

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This is a wild educated guess.

I repaired a Behringer guitar amp that had a DSP effects in it (BX1200 I believe).

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