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Beringer PMH 660M has very low power output to speakers and when the volume in increased the output pops in the speakers and goes completely dead, everything else works ok and the lights stay on

Everything on the mixer works ok, but when the volume is turned up very slightly it pops in the speakers and goes dead, If you turn off the amplifier and turn it back on it will come on very low volume and if you increase it again it pops and goes dead. It acts to me like there is a fusable low voltage driver for the high voltage output that has gone out and I need to find that part so I can replace it

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  • Gary Noyes
    Gary Noyes Feb 16, 2012

    I tried all the controls, nothing works. I had a speaker go out and after that it didn't work whe I put in the new speaker. I think its in a fusable link or chip on the low voltage side that feeds the high output to the speakers. I need ti find out where that chip or fusable link is but need a schamitic to find it. or some one that knows the circuit and can tell me what chip it is

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  • 431 Answers

Could possibly be the volume switch, try changing the switch with one that you hardly use to eliminate the problem. any further probs just let me know. hope this helps

Posted on Feb 16, 2012

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SOURCE: None of the channels work.

If you plug into the PA input or inserts of this unit, that DISCONNECTS all the mixing channels within this unit and none in this unit will work. That is how it is supposed to work.

If you wish to use another mixer as well as the channels in this, I suggest you run the other mixer into one of the stereo channel inputs OR the CD inputs, although the CD are NOT balanced inouts and subject to higher noise level.

Posted on Feb 01, 2011

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SOURCE: Peavey 8.5c, mains hum on

Swap the input cables to verify the problem stays with the same side... If it doesn't then repair the input cables or source of the audio. If it stays with the side, SUSPECT that one of the two signal wires (balanced) on the failed side has broken, probably at the input connector. Maybe bad solder where it comes in. The fact that the gain control affects the hum is GOOD as it means the problem isn't deep in the unit. Here is your schematic and service info:

http://elektrotanya.com/peavey_pv-8.5c_sch.pdf/download.html

Scroll down to the "Get Manual" link and click on it to download the manual.

Posted on Apr 27, 2011

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SOURCE: Mixer does not sound "clean"; almost distorted

If more than one input is bad, then problem has NOTHING to do with the preamps. Check list:
1. Make sure you are using BALANCED lines everywhere... either XLR or TRS cables.

2. Make sure ALL interconnected equipment, mixers, amps, powered speakers, CD players, etc. are ALL powered from the SAME receptacle or power distribution unit.

3. Do proper setup. Select each channel PFL and set the trims so the indicator never goes into clipping, but is in the 70% range during max volume input to mics, etc..

4. During operation the sliders should be at least 50% up on used channels and the mains. Setting of levels throughout the system is important for noise free operation. Using EXCESS gain at some point results in distortion and noise. Using sliders near the bottom position results in poor signal to noise ratio.

Now re-read #2 above... and believe it. I have seen a lot of equipment blown due to ground bounce of building power. That is why the pro's run power back to their mixer from the area where the amps are powered.

Posted on Apr 30, 2011

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