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Old 11th January 2013, 09:39 PM   #1
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Default Logic SoundLabs ABX-3000D help

I recently replaced the IRF1010E's in this amp they were blown in half, Anyway I replaced them and hooked it up it played for about 1-2 mins then POP and well you know what happened, it ate them again. Can anyone tell me what I missed?
s it even worth repairing again? It appears to be a nice amplifier.
Any help would be greatly appreciated.
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Old 12th January 2013, 10:07 PM   #2
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Now that I have had the post in right place and Ive tried to refresh my mind with the tutorial, very informative by the way. I can get back to trying to explain what I have found. When I removed the blown FETs I noticed there were resisters that were pretty toasted so I removed one to try to read the color code but was not able to properly identify it. So I did measure them and all were in the 52 ohm range, but in the other post he said they were 47ohm gate resisters. Its been a few years since ive done any audio repair I usually stick to mechanical work but I do know a little and always willing to learn more. So please be patient with me.
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Old 13th January 2013, 12:01 AM   #3
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Did you check the driver transistors?

With the power supply FETs out of the circuit, measure the DC voltage on the gate pads for the FETs. You should read approximately 5v.
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Old 14th January 2013, 01:40 AM   #4
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Im getting 4 volts from the first 2 and the last 2 FETS(total of 8) I also tested the 4 undestroyed ones along side 2 new ones from the lot of 10 I bought and the were good.I am going to download the datasheets for the 4 transistors(2 A1023's and 2 C1027's) I am assuming are the driver transistors, should I pull them and test them?
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Old 14th January 2013, 03:11 AM   #5
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Post a photo showing the entire power supply and mark the voltage on all of the power supply FET gates.
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Old 15th January 2013, 12:35 AM   #6
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Click the image to open in full size.


Ok if you zoom youll see where I put 4's on the FET pads that showed 4 volts and the 0's where no voltage was produced. hope this helps.
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Old 15th January 2013, 01:30 AM   #7
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IT appears that there are several problems. You need to confirm that all of the gate resistors are within tolerance. I can't read the color code on them so I can't tell you what they're supposed to be.

The drivers also appear to be damaged. Remove them and check them.

Measure the DC voltage on the 3rd leg of the drivers after removing them.
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Old 15th January 2013, 04:41 AM   #8
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Click the image to open in full size.

ok the driver transistors are definately part of the problem.(they are pulled and tested)
I managed to pull a color code from one of the gate resistors, 47 ohms.(all showed this ohm)
In the modified photo I tried to show my findings for voltage all inner pins of the group posted 4.6 volts.
Center pins of the 2 trannys closest to the FETS posted 11.5 volts.
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Old 15th January 2013, 06:16 AM   #9
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It's normal for the center legs of two drivers (C1027) to read about 12v. The center legs of the other two center legs (A1024) should read 0 ohms to ground. I can't really see the other markings. If it reads 4.6v for all 4 drivers, the drive signal from the driver IC is likely OK.
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Old 15th January 2013, 02:12 PM   #10
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Ok all 4 drivers are receiving 4.6V,center legs of C1027 are 11.5-12V,center legs of the A1023's are 0 ohms to ground. Lookin good, so if I replace to IRF1010E's(8 of them),8 47ohm 1/4 watt resistors, and 2 2SA1023's and 2 2SC1027's. Does that sound about right?Now when I tried to look up data sheets for the drivers I could only find them in a different packageing but will keep looking.
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