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Old 8th March 2013, 04:48 AM   #1
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Default kicker zx1500 mosfet question

Im trying to replace the irf3205's and im not sure which one i need. Digikey has a bunch to choose from, if somone could lead me in the right direction it would be very appreciated.
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Old 8th March 2013, 05:43 AM   #2
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Any in the same case style will work. If they have the exact part number, buy those. These are probably the same as the originals:
IRF3205PBF-ND

You'll probably also need gate resistors and possibly driver transistors.

Have you checked the output transistors?
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Old 8th March 2013, 05:57 AM   #3
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If those are the black things that stick straight up kinda in the middle of the amp, i measured them while still in the board and they all read the same thing. Which are the driver transisters?
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Old 8th March 2013, 10:16 AM   #4
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The output transistors are the large transistors clamped to the heatsink.

The driver transistors for the power supply transistors are Q24-Q27.
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Old 8th March 2013, 02:53 PM   #5
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I checked q24-q27 they all had the same reading. Gate resistors are the little tiny things that say 100 or 104 right? I read somewhere to replace them with smaller ones is that correct? I also read on here to replace the output transistors with a different one than the original is that correct as well?
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Old 8th March 2013, 08:54 PM   #6
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In the amps that I've worked on, the gate resistors were 100 ohms (marked 101). Do the gate resistors for the power supply FETs appear to be the original parts or does it appear that they've been replaced?
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Old 8th March 2013, 09:51 PM   #7
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seems original to me, i bought the amp refurbished only thing that seemed differant to me was one of the transistors or whatever it is that gets clamped down diagonally across from the fets had an allen key screw instead of a regular screw like it was replaced.
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Old 9th March 2013, 10:06 PM   #8
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Post a photo of the resistors on the board.
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Old 11th March 2013, 04:36 PM   #9
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Here some photos. Its the two on top in the picture with 3 sets of 2.
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File Type: jpg 049.jpg (365.7 KB, 28 views)
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Old 11th March 2013, 09:12 PM   #10
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The gate resistors that you'll need to check are for the IRF3205s, which are missing in the photo. If the output transistors have not failed, do absolutely nothing to that part of the amp.

The gate resistors for the 3205s will be near the 3205s.

Please read the basic amp repair page (link in sig line below), including the section about taking good quality photos.
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