behringer powered mixer - must force clipping w/ pad off in order to run normally????

zappacrappa · 14th July 2009, 02:50 PM

I have a Behringer PMH880S 10-Channel Powered Mixer with FX (800 Watts). Its only a year old. All of a sudden I notice my left channel doesn't work, but I can still kind of hear scratchy sound coming through. So I force it to clip, and then its normal; perfect regular sound coming through like the right channel. Why do I have to have a loud sound (clip) to make the left channel work. I only have to force it to clip when I first turn on the amp. Even after I turn the amp off, if I use it within the next 10 minutes, the left channel still works fine. If I leave it for more then say 20min, I have to re-clip the left channel by making a loud sound in the microphone to make it work again.

EchoWars · 14th July 2009, 07:23 PM

Intermittent / bad solder connection, or a flaky semiconductor somewhere that needs to be beaten into submission before it decides to work.

The possibilities are endless...

Wavebourn · 14th July 2009, 07:37 PM

It is definitely bad contact somewhere. You need to open it and go through it with a scope.

Enzo · 15th July 2009, 04:01 AM

Find the power amp in jacks for that channel, squirt in some cleaner, and work a plug in an out several times. See if that helps.

It really sounds like a cutout contact on a switching jack somewhere.

Failing that, squirt some cleaner in hte power amp assign switch and the speaker processing switch and slide them bac and forth a forth a few times.

It doesn;t really sound like a bad electronic component.

14th July 2009, 02:50 PM	#1
zappacrappa diyAudio Member Join Date: Jul 2009	behringer powered mixer - must force clipping w/ pad off in order to run normally???? I have a Behringer PMH880S 10-Channel Powered Mixer with FX (800 Watts). Its only a year old. All of a sudden I notice my left channel doesn't work, but I can still kind of hear scratchy sound coming through. So I force it to clip, and then its normal; perfect regular sound coming through like the right channel. Why do I have to have a loud sound (clip) to make the left channel work. I only have to force it to clip when I first turn on the amp. Even after I turn the amp off, if I use it within the next 10 minutes, the left channel still works fine. If I leave it for more then say 20min, I have to re-clip the left channel by making a loud sound in the microphone to make it work again.

14th July 2009, 07:37 PM	#3
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	It is definitely bad contact somewhere. You need to open it and go through it with a scope. __________________ The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity!

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14th July 2009, 07:23 PM	#2
EchoWars diyAudio Member Join Date: Dec 2002 Location: Left of the Dial	Intermittent / bad solder connection, or a flaky semiconductor somewhere that needs to be beaten into submission before it decides to work. The possibilities are endless...

15th July 2009, 04:01 AM	#4
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	Find the power amp in jacks for that channel, squirt in some cleaner, and work a plug in an out several times. See if that helps. It really sounds like a cutout contact on a switching jack somewhere. Failing that, squirt some cleaner in hte power amp assign switch and the speaker processing switch and slide them bac and forth a forth a few times. It doesn;t really sound like a bad electronic component.

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