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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, 05:00 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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File Type: png u3p7.png (36.2 KB, 3 views)
File Type: png u3p8.png (32.2 KB, 4 views)
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Old 7th December 2017, 04:22 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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Old 10th August 2018, 09:42 PM   #33
bl4ckw1d0w is offline bl4ckw1d0w  United States
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Join Date: Oct 2011
Location: Minneapolis, MN
Quote:
Originally Posted by jacampb2 View Post
There is also a SMD diode missing from the driver board. The other one in the same package on the board is 639A, I searched high and low for that, and it looks like it might be a 18V zener transient surge suppressor. I would like confirmation if anyone has the info.

Thanks,
Jason
Just wanted to add a photo of the complete audio driver board for reference as I'm working on the same amp currently and the amp. The wierd thing about mine is it also had a shorted zenner going Into the driver board but when I sucked the solder out of the vias I found it was like they cut the leads and soldered into place or they just broke off inside the via which is a first for me.
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Old 10th August 2018, 10:04 PM   #34
bl4ckw1d0w is offline bl4ckw1d0w  United States
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Join Date: Oct 2011
Location: Minneapolis, MN
So I remember replacing that diode on an Alpine MRV-M500 and luckily Alpine has really good service manuals listing part numbers. I found the part by googling "1SR159". See attached PDF.
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Old 10th August 2018, 11:24 PM   #35
jacampb2 is offline jacampb2  United States
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Join Date: Aug 2007
Location: Beaverton, Mi 48612
I reverse engineered the complete driver last winter. Thread linked here clicky.

Good luck,
Jason
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