Behringer A500

rene1234 · 4th January 2011, 01:00 PM

I have 2 Behringer A500s that apart from a few problems (front pots dirty etc) One channel has now developed a fault where the clip and prot LEDs come on and off with the sound. Anyone have a full schematic?

meanman1964 · 4th January 2011, 05:07 PM

Here you go

LAJ · 4th January 2011, 06:13 PM

This is a classic QSC style amp with the grounded collectors on the outputs. If your outputs check good, then you've most likely got DC coming out of your op amp (causing DC on the output). The op amps fail frequently if an output fails because they are DC coupled. Check for unbalanced supply rails to the op amps first as this is the most frequent source for trouble in these amps. Also check caps. Good luck.

4th January 2011, 01:00 PM	#1
rene1234 diyAudio Member Join Date: Jan 2011	Behringer A500 I have 2 Behringer A500s that apart from a few problems (front pots dirty etc) One channel has now developed a fault where the clip and prot LEDs come on and off with the sound. Anyone have a full schematic?

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4th January 2011, 06:13 PM	#3
LAJ diyAudio Member Join Date: Mar 2008 Location: Atlanta Ga. USA	This is a classic QSC style amp with the grounded collectors on the outputs. If your outputs check good, then you've most likely got DC coming out of your op amp (causing DC on the output). The op amps fail frequently if an output fails because they are DC coupled. Check for unbalanced supply rails to the op amps first as this is the most frequent source for trouble in these amps. Also check caps. Good luck.

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