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Old 3rd July 2013, 03:31 AM   #1
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Location: Flint, Michigan
Default kx2500.1 help please

I recently picked up kx2500.1 by kicker, right out of the gate the power supply needs a rebuild, Ive read the other posts about these amps one success story and one just faded away right before the good stuff.
Theres 20 FETS that ill order there also is a vertical board that has a burned capacitor not sure if that would have anything to do with it, is this possibly the driver board?
any info anyone could provide would be greatly appreciated.
Thanks
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Old 4th July 2013, 03:32 AM   #2
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Well pulled 20 irf3205's getting 12v center leg and 4.37v outter leg. so far so good, this is weird it has 151 ohm gate resistors. all sounds good but i dont want to get ahead of myself. Do i need to go any farther or just replace the FETs?
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Old 4th July 2013, 07:47 AM   #3
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Im not sure as i have not dealt with that amplifier very much but contact db-r from any of the car audio message boards and hes a good guy and can def help you out. Hes the leading amp repair guy in the car audio world right now.

caraudio.com
diymobileaudio.com
caraudioclassifieds.org

just to name a few.

or message him at his website db-relectronics.com or something like that.

Hope i helped.
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Old 5th July 2013, 07:29 PM   #4
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Thanks Ill see what I can find.
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Old 9th August 2013, 09:43 PM   #5
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Ok replaced all the fets, now cycling in and out of protect mode, so I start metering outputs, found a IRF9640 shorted and a FBJ1N200.

In this amp the are 4 groups of 3 IRF31N20D's and 5 IRF9640's

Both bad components were in the same group.
Should I still change all 4 groups at the same time?
Or can I change the bad group?

Anyone know if I can use IRF640's in place of the FBJ's?

Last edited by dartssport; 9th August 2013 at 10:10 PM.
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Old 9th August 2013, 10:05 PM   #6
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No. The parts are IRFB31N20Ds.
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Old 9th August 2013, 10:11 PM   #7
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Sorry they are IRF31N20D's my eyes are worse than I thought!lol
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Old 9th August 2013, 10:18 PM   #8
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Don't buy them from ebay.
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Old 9th August 2013, 10:30 PM   #9
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Oppss now ya tell me, does that mean all the parts i bought from ebay are going to fail???
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Old 9th August 2013, 10:37 PM   #10
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Is there a cross or do you know of a place that sells them im coming up short.
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