Behringer pmp3000 high voltage amp

[STACY AUSTIN]

I HAVE BEHRINGER PMP 3000 WITH 107 VOLTS COMMING OUT OF SPEAKER CHANNEL 2. WHAT WOULD BE THE PROBLEM THAT WOULD CAUSE SOMETHING LIKE THIS. IT BLEW MY SPEAKER UP OF COURSE AND I NEED TO KNOW IF THIS IS A FIXABLE PROBLEM.

[Enzo]

Turn off your caps lock please.

You have a shorted output transistor on the power amp module.

[STACY AUSTIN]

Can this be repaired

If a output transistor is shorted on the power amp module can it be repaired or replaced without replacing the whole . Do you know of a site that might give me the info to fix without sending it off to repair shop. I am pretty good with electronics repair if I am coached on how to fix it. Hint , Hint

[Enzo]

I cannot provide schematics. You can look on your power amp module and check the MOSFET transistors on the heat sink, typically IRFxxxx types. ANy shorted? ANy resistors look burnt? ANy open power resistors?

ALWAYS check the power supply for discharged condition. If powr is applied and removed, the high voltage power supplies can remain charged for a long time. You don;t want to plug the power amp back in that way Use a resistor and clip wires to discharge both supplies.

[jrfrond]

You may be in for a long ride on this one. Like Enzo said, you have AT LEAST a shorted MOSFET, but there could be more..... LOT'S more. By replacing the MOSFET and turning it on again, all you might earn is a string of dead MOSFET's and a burned PCB for excessive soldering/desoldering. You might want to call in a pro on this, or get a replacement module.

[STACY AUSTIN]

Behringer voltage problem

So by replacing the module do you mean the amp inside the mixer . After opening the mixer up i see where there is the amp with the copper coils on top and then there is another board that plugs into the amp that comes off the power supply. It goes between the power supply and the amp itself. The power going from the board that feeds into the amp is suppose to be feeding 120v or so into the amp. Right?
I have a test meter if that would help me fgure out which transistor is shorted out if thats a possibility. I really dont feel like spending $150 on a new amp if its something i may take care for a few bucks. I have a digital camera that if i could take a pic of the front and back of the board that is in question and email it to someone and maybe you could guide me on which areas to test with my meter. I dont mean to be hard headed but I would like to at least attempt the least expensive way first and see if I can accomplish this with somes help. With the way money is these days I really dont mind trying. Any help would be greatly appriciated.
Thank you and God Bless

[amptech]

Behringer pmp3000 mixer amplifier

Hello there,

There's a few ways to sort this unit,

one fit a replacement power amp (2) carry out a mod using class d power amps boards that will do the job and get you out of this problem.

Also add bleeder resistors to the ht caps that feed the main power amplifier to drain that stored voltage. (3) use it as a mixer and feed the line out signals to a slave amp.

This unit can be be a pain in the butt as that power amp board hates being reworked alot!


best of luck with your unit as I spent a lot of time moding this unit due to hard to get parts and you do what you can to keep your clients happy.

[zero cool]

this is a difficult amp for a beginner to start with as it is not a conventional amp. it is a switching amp and therefore has its own set of problems. I have found that when the mosfets go in these amp modules. there is also some .03ohm surface mount resistors that go also. (I think that was the value if i remember correctly). I would be cautious trying to repair this amp by yourself.



Zc