Question about Behringer Pmp3000 16 Channel Audio Mixer

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When I plug in my XLR microphone to my Behringer PMP3000 it only works on the Main/Mon function not the Main L/R function, and when it is working it only amplifies through one speaker. WHY???

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Check if the PAN control for that channel is set at 12 o'clock position.

You can "pan" the mic to either L or R speaker or anything between.

On the Main/Mon setting, the level sent to the Mon side is controlled ONLY by the Mon level pot for that channel.

Posted on Oct 04, 2010

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  • sean_kay Oct 08, 2010

    The pan is at 12 O'Clock and still only amplification through one speaker on the Mon/Main setting... The pan does nothing on this setting...

    On the Main L/R setting there is no amplification what so ever through any of the channels both 1/4 inputs and XLR inputs. Theoretically if I plug a mic in and the mixer is on the Main L/R setting it should work right? It is registering on the LED level on the right of the mixer that sound is being produced but it seems as though it is not getting any further than the mixer itself as I cannot record anything either. When I plug in an external source (ie. Ipod) into the output RCA connections I can get amplification through both speakers with complete control. I am totally stumped! Possible blown channel perhaps???

  • Fred Yearian Oct 08, 2010

    Oh, oh... I know this symptom... I suspect one channel is blown... Usually the rear-most one... I think it is the "A" channel.

    IF YOU GET NOTHING from that side of the amp CEASE using the amp and get it repaired immediately. The reason is that further damage can be done if it arcs and wipes the power supply as well as that side of the amp.

    THERE IS A WEAK INSULATION CONDITION BETWEEN LAYERS OF THE MULTI-LAYER CIRCUIT BOARD and when it arcs between layers it wipes out three switching transistors and usually a Zener diode. The repair of the module is extensive and if under warranty just take it in for repair. IF further shorts occur it can wipe the power supply out causing a loss of anothe $30 of parts and a couple hours to replace them.

    If you still get speaker output from both outs, then the amp is probably OK.

    I have repaired 4 of these myself and it takes hours to carve out the "cancer" and replace the parts and install jumpers.

    Also please read my tip on Fixya regarding a hazard of speaker polarity. You can wipe out the on side amp in an instant due to the hazard.

  • sean_kay Oct 08, 2010

    Suspected as much, however like I said in the above email when I plug in an external source to the output RCA's it goes hard! Full amplification to both speakers with full EQ optimisation with PAN control, effects, the works... It is only when I plug anything into the input channels... Possible input channels blown???? Thanks so much for your input fredy2!!!!

  • sean_kay Oct 11, 2010

    Hi Fredy, you have had a go at solving the problem with my PMP3000 mixer but I am still having dramas. I will run through what is going on and if you could offer any advise that would be wonderful!

    OK, if I plug the PMP3000 in to the wall, hook up the 2 Phonic SE725 speaker cabinets (Speakon to 1/4) and plug an external source (ipod/computer) into the OUTPUT RCA connections I have full use of the EQ, FX, BAL, FAD the works, on the Main L - Main R function.... Then if I disconnect the external source and plug in anything (mic/guitar etc) into any of the input sources I get no sound output. However I do get recognition of the sound generation on the LED level display.

    If I then switch the mixer to the Mon1 - Mono function I can get sound output from the Mon1 level through one speaker, nothing else. CAN YOU HELP???

    A huge thankyou for your time. The mixer is not under warranty and I would like to be able to go to an electrical engineer and tell him exactly what the problem is and possibly even source the parts so as to keep cost to a minimum.

  • Fred Yearian Oct 11, 2010

    OK, I have schematics for the PMP series... The schematics cover MANY pages and tracing out the signal path is tricky... HOWEVER, since the display seems to be working and the channel is not, this comes down to a very small area that can be the trouble. The MOST LIKELY thing is a failure or dirt in the configuration switch that selects Mono/Mon, MAIN L and R and bridged mode. This switch selects the signals sent to the power amps but there are more than one path that merge here. This would be a real pain to access to replace or repair... IF it happened to be bad solder on the circuit board one could probably do that by taking the shield panel off the back of the mixer board... this is still a lot of work...

    Please read my tip on the PMP amps regarding speaker polarity and a grounding hazard in the tips on here. One can wipe out one channel in an instant.
    I want you to try something first: Procure some CRC226 from Home Depot in the electrical dept. With the spout, spray a tiny bit into that switch and work the switch ... do this a couple times and see if it just might come back working... use ONLY CRC226 in the blue can. It is also good to repair noisy slider/faders and pot.

    If you still can't get it to work, let me know and we will go further.



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I assume you mean the input channels.

Things to check:

1. Do the sliders work smoothly or do they have rough spot?

2. Is the trim (top knob) turned up?

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4.Are the pan controls set center? Mutes off?

5. Has any liquid been spilled into the unit?

6. Has an "accident" occured such as driving the inouts with a high voltage or something with a ground loop? Has something smashed down on the slider knobs? (this sometimes breaks the resistance element in the sliders or cracks the board.

A reasonable amount of troubleshooting can be done from the available outputs and some of the above things may seem silly, but with all the options on these units it is easy to overlook something.

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