Question about Behringer Pmp3000 16 Channel Audio Mixer

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I need help on changing a fuse in PMP3000. The mixer went out on us one day, so I hooked it into an amp that we had. It works good as an unpowered mixer, but cannot get it to work as a powered mixer. I am assuming a fuse is blown.

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  • Behringer Master
  • 5,603 Answers

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.

There is probably $15 of parts blown in each side of the power amp and it takes about 6 hours to repair. One has to grind out the burned area (internal layers not necessarily visible on surface) and re-insulate and then install jumper wires to replace those taken out.

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.

You can find HCA2400 power amp module replacements for about $175 online.

Use of the unit as an unpowered mixer is a bit dangerous as if arc re-establishes it can fry the power supply taking out two very expensive IGBT's and many other components. If the mixer still works, then your whole power supply is still OK.

Posted on Sep 10, 2010

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BEHRINGER USA, Inc.
18912 North Creek Parkway, Suite 200
Bothell, WA 98011
Tel.: +1 425 672 0816
Fax: +1 425 673 7647

I just repaired a PMP3000.

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If the fuse ever blows do NOT replace the fuse as much more damage will result. Service the unit before using.

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