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Old 9th November 2012, 07:49 PM   #41
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Ok got the parts today and made the repairs to the audio driver board. Installed everything and put the amp in the sink and clamped it down.

The amp powers up and idles fine. It has +/- supply voltage to all of the op-amps, it is producing +/- rail voltage, everything seems to be good.

There is no audio........I think the little black relay is suppose to "click" when the amp is powered but its not. Sending a 100Hz sine wave to the amp with the scope set at 2ms/5vd when I increase the volume all I hear is a LOUD buzzing noise from the board which I think is coming from that relay but not sure.

I see no audio on the scope. There is no DC on the output terminals.

Am I missing something??? Not sure whats going on here????
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Old 9th November 2012, 08:33 PM   #42
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U check the diode beside the relay?
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Old 9th November 2012, 08:44 PM   #43
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There is a small diode D201 I checked it and it has 14.01 vdc on both sides.

Could the relay or coil or whatever it is be bad??
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Old 9th November 2012, 09:05 PM   #44
timwebb is offline timwebb  United States
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Could be. Is there 12v across the relay?
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Old 9th November 2012, 10:28 PM   #45
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I am at work now I will have to check later this evening. Does this relay connect the audio to the output terminals?
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Old 9th November 2012, 10:29 PM   #46
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On the large output filter inductors, do you have rail-rail oscillation on one terminal and audio on the other terminal?

Yes. The relay is in series with the audio output signal.
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Old 9th November 2012, 10:35 PM   #47
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I will check that later when I get home from work but what tells or makes the relay switch or click on?
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Old 9th November 2012, 10:49 PM   #48
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It's switched through a group of components. Q5 is what drives it but the amp could be in protect. Checking the points that I listed will tell you if the amp is working properly otherwise. If so, you troubleshoot the drive circuit for the relay. If there is a problem with the amp's audio circuit, you troubleshoot that. When the audio is working properly, the relay may engage.
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Old 9th November 2012, 11:29 PM   #49
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Ok I understand, but is there multiple protection circuits in this amp? The blue led is lit on one end and the green led is lit on the other end. The red protection light is not on, so I assumed it was not in protect. Am I wrong?
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Old 10th November 2012, 12:10 AM   #50
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I didn't look at the entire circuit previously.

Look at the DC voltage on transistors Q3, 4 and 5 on the PS driver board. Those should tell you why the relay isn't engaging.
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