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DB drive OKUR A7 2000.1 driver
DB drive OKUR A7 2000.1 driver
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Old 6th December 2017, 04:00 PM   #31
jacampb2 is offline jacampb2  United States
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Join Date: Aug 2007
Location: Beaverton, Mi 48612
U3 (bottom TL072):
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Old 7th December 2017, 03:22 PM   #32
jacampb2 is offline jacampb2  United States
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Join Date: Aug 2007
Location: Beaverton, Mi 48612
Quick update, I think it is fixed for real this time. Perry, when you said those driver ICs were sensitive, you meant it. This morning I removed all the ICs I replaced just to make sure the solder paste did not bridge anything under any of the chips. I was really grasping at straws. I cleaned the board again, reinstalled them and put it back in the amp. All the wave forms were the same except all of the sudden I lost all of the gate drive I had.

I checked the IC again per the previous instructions, and it was shorted. I removed it and put in the 3rd IC and voila! We have perfect square waves on the gates, with and without a load attached. I tested with the function generator and the distortion is gone. I will have to do burn in tomorrow, my back has had about all it can take for the day.

Thanks for the patience and for the assistance.

Jason
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