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Ch. 1 No sound, Level Set LED on

My ch. 1 on my pmp4000 seems to not work, all other ch. are working fine. Phantom power is off and not in Bridged mode. All settings are identical across the board for each channel. The LED lamp for Level Set stays on (solid; not blinking). No sound (not even static) when using the mic (xlr connection). Any ideas? Thanks.

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  • Wayne Casey Jun 06, 2013

    Forgot to mention I am using dynamic mics. Thanks.

  • Wayne Casey Jun 06, 2013

    Added this in wrong category. Re-asked with proper category. Thanks.

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This is a tough one because your LED for the Level Set is Illuminated, meaning that it sees a signal. With that being the case, the signal from the mic is getting from the input jack to the channel strip, but is not passing through to the preamp for that channel. So....either the channel strip is faulty, or the circuit going to the preamp is bad. As the other channels are probably ok, the trouble is most likely in the channel strip for Channel 1. Definitely have this looked at by a tech familiar with Behringer boards. If you can function without that channel, it will be cheaper than the repair, as the design of your board prohibits swapping out channel banks. I wish you luck and success with this issue.

Posted on Dec 06, 2017

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Posted on Jan 02, 2017

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SOURCE: I have two xlr combo inputs which have phantom

This sounds bad... I suspect that a noise suppression cap on one side of the bad channel has shorted... possibly due to a static discharge.
Test for this doing this: Using a meter, with nothing plugged in and phantom on, check the voltage at both pins 2 and 3 to pin 1 of the XLR connectors. If you find either pin 2 or 3 is much lower than its mate (they both should be 15 volts to 48 volts positive), then one side noise filter cap probably has shorted. Unless you are electronically adept at repair, take it in for servicing.

Posted on Dec 20, 2010

Testimonial: "Thanks for the advice, makes sense to me the way you describe the test protocol. At current bench rates, I'll have to see if I can fix it myself. "

cnavarro
  • 2460 Answers

SOURCE: Can not get any sound

When you get to page 13 of your user's manual, notably sections 6, 7 and 8, you'll find that Phantom power works on an XLR cable, not 1/4".

So, unless your Mic has batteries, you need a different cable.

Carl

Posted on Mar 05, 2011

  • 5603 Answers

SOURCE: I have a Yamaha IM8.

There is really no way for a condenser mic to damage the board UNLESS you break the ground and get a static discharge into the input. That can happen with any microphone and has NOTHING to do with the phantom being on or off. As phantom power goes on and off slight bias at the input preamps can make amps non-linear causing the raspy sound you heard. The Phantom LED means NOTHING as it shows the state of the phantom switch by connecting a 12 volt source through a resistor to the LED... It shows NOTHING regarding the state of the 48 volt supply. Each input circuit has two 6.8Kohm resistors to the swinger of the phantom switch 2nd pole that either grounds those or connects them to a filtered 48 volt source. As long as you don't have a static buildup there is NO need to turn phantom power on or off while connecting a condenser microphone. At each input when using the XLR jacks are two per side 470pf capacitors for RF bypass. For the XLR's there is a 10Kohm between the signal lines and two series 10mfd/50 volt caps in series of each input to block the DC, when using phantom power, from reaching the preamp stage. These caps have to charge and discharge when changing the state of phantom power so you should AVOID having the main amps being driven while changing the state of any phantom power. Always have the fader(s) down and any monitors down to avoid a thump and also the non-linear raspy transition as the input caps charge/discharge. So fix the microphone... don't know what type you have, but DO check the cable (first) as ALL three conductors MUST be good for a condenser mic to work on phantom power. A ground leakage or noisy connection will cause your symptoms. Use a SHORT known good cable right at the board to test the mic. The 48 volts is applied through the two 6.8K resistors between both the signal lines to the shield of your XLR cable. The microphone picks off the 48 volts with a similar circuit.
Now let's cover a very important thing regarding system safety: ALL, and I do mean ALL interconnected equipment MUST be powered from the same source. Professionals run a power cord back to their mixer right alongside the snake. This is to avoid ground bounce damage due to bad building grounds or ground faults.

Posted on Mar 22, 2011

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