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PowerBASS ASA1500.1D
PowerBASS ASA1500.1D
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Old 14th July 2017, 10:30 PM   #1
Formas is offline Formas  Jamaica
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Default PowerBASS ASA1500.1D

Hello guys Iím repairing the power supply on this amp, it had blown all the fets from the original installment which was irf48, Iíve installed rfp50n06 and it played for 10mins on one double coil 4ohms (2ohms) after I added another Speaker making the total ohms 1ohms it played about 2minutes.
Iím rebuilding the power supply again but Iím using the o-scope and Iím not getting a solid square wave on the gate of the mosfets.
Should I also change the gate drivers and the KA3525 (even tho the fets arenít overheating?).
Iíve attached the waveform Iím getting see if Iím wrong.
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Old 14th July 2017, 11:44 PM   #2
Perry Babin is offline Perry Babin  United States
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Reduce the 12v supply voltage as far as you can without causing the supply to shut down. Does that give you the expected waveform?
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Old 15th July 2017, 12:13 AM   #3
Formas is offline Formas  Jamaica
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I’m not on a variable power supply but what I’ve noticed is when I put audio thru the amp and increase the gain it will slide into the desired square wave then I will feel the fets beginning to warm, I didn’t play it beyond a minute as I didn’t assemble it in the heat sink chassis (it’s on a 4ohm speaker).
Is there another fault?
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Old 15th July 2017, 06:05 AM   #4
Perry Babin is offline Perry Babin  United States
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What are you seeing that makes you think that there is a fault?
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Old 15th July 2017, 01:11 PM   #5
Formas is offline Formas  Jamaica
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Well I'm not seeing anything other than to think I would get a solid square wave at idle, and the fact that it failed the second repair of fets on a load of two double 4ohms coil kicker (1ohm total).
My question Mr Babin, is this amp a true 1ohm stable? As the customer says he played it for almost a year on one kicker double 4ohms and only had issues recently when the second speaker is been added.
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Old 15th July 2017, 10:23 PM   #6
Perry Babin is offline Perry Babin  United States
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I don't know how reliable it is at 1 ohm but I'd expect it to last for more than 2 minutes.

There are 4 drive circuits that all need to be checked. Are you sure that all 4 drive circuits are OK? Check at the gate of every FET.

This amp appears to have a regulated power supply so it will reduce the duty cycle of the drive when the target rail voltage is reached.
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Old 17th July 2017, 10:36 PM   #7
Formas is offline Formas  Jamaica
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I didn’t find any additional problems and the amp is up and performing as expected on one Speaker (dual VC at 2ohms each) hard hitting. But I don’t think that amp is 1ohm stable in my opinion. I don’t think he has a faulty speaker either as it played either one at any given time but when it’s parallel that’s where the initial problem started. Thanks again on this one.
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Old 18th July 2017, 05:43 AM   #8
Perry Babin is offline Perry Babin  United States
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Not having a variable supply makes checking the drive signal difficult. Do you have access to a variable supply?
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