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Old 5th August 2012, 05:51 PM   #41
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yes it was on master and yes i have a scope
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Old 6th August 2012, 03:16 PM   #42
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After pin 6 on the driver board drops to near 0v, do you see rail to rail oscillation on the output transistors? The oscillation will be on leg 3 of half of them and leg 2 of the other half. You may have to drive an audio signal into it to make it oscillate.

Set the scope to 5us and 50v/div. You may have to adjust the trigger level to get it to lock on the waveform.

If you do see oscillation, do you have audio on pin 1 of the audio driver board?
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Old 6th August 2012, 08:21 PM   #43
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not getting any oscillation on any legs of output transistors or on pin 1 of driver board, driving input with 41hz tone
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Old 6th August 2012, 09:22 PM   #44
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Pin 1 should have normal audio.

Do you have regulated voltage on the power supply pins of the op-amps?
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Old 6th August 2012, 09:27 PM   #45
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which pins are power supply pins on op-amps?
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Old 6th August 2012, 09:33 PM   #46
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For an 8-pin op-amp, it's pins 4 and 8. 4 should have negative voltage and 8 should have positive voltage (approximately 15v).
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Old 6th August 2012, 09:53 PM   #47
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i get -13v on pin 4 and -3.5 v on pin 8 of each op-amp
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Old 6th August 2012, 09:58 PM   #48
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It appears that the +15v regulator is defective. You'll have to determine what's being used for regulation. I don't have any information on this amp. If you can't find the regulator, post a photo of the entire board.
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Old 6th August 2012, 10:41 PM   #49
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j13 7815a and j14 7915A are 15v regulators

Last edited by bigpun4fubu; 6th August 2012 at 10:49 PM.
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Old 6th August 2012, 10:53 PM   #50
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Is the 7815 producing output?

Does it have input voltage?
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