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Rockford Fosgate Power 300 buz10 toasted
Rockford Fosgate Power 300 buz10 toasted
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Old 13th March 2019, 02:17 PM   #1
Josheep is offline Josheep
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Join Date: Mar 2015
Default Rockford Fosgate Power 300 buz10 toasted

Hi people,
Iíve got a Rockford Fosgate Power 300 with a burnt out Buz10 in it. Iím hoping to bring it back to life and have seen that another poster was recommended the IRFZ44 as a replacement with 100ohm gate resistors needed with it. Can anyone point me to a schematic, or even better (for an inexperienced amp guy) an idea of which resistors they are on the board so I can replace them? Id like to maintain the quality of sound not looking to upgrade so to speak, unless thereíre definite upgrades worth replacing them with. Any help much appreciated, Josheep
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Old 13th March 2019, 02:38 PM   #2
Perry Babin is offline Perry Babin  United States
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The gate resistors are the 390 ohm resistors connected to leg 1 (the gate) of the BUZ10s.

See attached.
Attached Files
File Type: pdf power 300.pdf (310.6 KB, 8 views)
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Old 13th March 2019, 03:18 PM   #3
Josheep is offline Josheep
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Amazing, thank you for the info and the schematic Perry. I'll get some IRFZ44's ordered up and will report back. Hopefully it's just that that's wrong with it. I found it in my dads shed where it's been for 18 or so years. I've got my fingers crossed!
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Old 13th March 2019, 06:02 PM   #4
Crazylogix is offline Crazylogix  United States
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Just so your clear, you will need to replace all the Buz10 fets in the power supply and the gate resistors, you cannot mix and match. That means you need to order at least 8 (order 10). You can remove all the old ones and old gate resistors and install one fet and resistor on each side to test before you install them all.
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DMM - HP 1222A scope - Hakko FX888D - 50w Unger iron - Yihua 858D Hot Air - 65A power supply (modded dell server) - 1000w 4 ohm test load - test sub - My Youtube repair videos -> Crazylogix
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Old 13th March 2019, 06:32 PM   #5
Josheep is offline Josheep
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Thanks crazylogix, yeah I’d figured they’d all need doing. I’ve had a look on mouser and can get the IRFZ44PBF but not just the IRFZ44, I can’t see any difference in the spec sheet (to my untrained eye) would they be the ones? There seem to be loads of different versions of them, and a bunch of the straight IRFZ44 which I’m assuming are cheap copies on eBay. I’ve got a variac so can test nothing else is up once I’ve replaced the first one and resistor.
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Old 13th March 2019, 06:55 PM   #6
Crazylogix is offline Crazylogix  United States
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Join Date: Apr 2018
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The PBF stands for lead (PB) Free (F). Any of the IRFZ44 in the TO-220 package will work. They are all super close to each other, I use the 115watt IRFZ44V, it has worked for me in all sorts of amplifiers.
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DMM - HP 1222A scope - Hakko FX888D - 50w Unger iron - Yihua 858D Hot Air - 65A power supply (modded dell server) - 1000w 4 ohm test load - test sub - My Youtube repair videos -> Crazylogix
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Old 13th March 2019, 07:35 PM   #7
jkrokenberger is offline jkrokenberger  United States
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Join Date: Jun 2018
The IRFZ44pbf is the one you will want. The power supply is push-pull so you can test it with 1 FET per side on the board so long as you apply no load. It would be a good idea to get a number of extra Z44's when you make your order, I like to get 25-30 if 10 are needed.
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Old 13th March 2019, 08:03 PM   #8
Josheep is offline Josheep
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Join Date: Mar 2015
Is that to say that for this application the IRFZ44VPBF wouldn't be right? And I'd love to get more than 10 but both my cards got refused for some shopping today so the £9 is doable but anything over that is gonna have to wait until next month =(
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Old 13th March 2019, 08:13 PM   #9
caraudioguy2100 is offline caraudioguy2100
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Use the IRFZ44NPBF and you should be set
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Old 13th March 2019, 08:22 PM   #10
Josheep is offline Josheep
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Sorted, all ordered and ready to go =) thanks everyone. I'll report back when done and tested.
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