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Old 27th May 2013, 10:17 PM   #1
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Default oldschool rockford fosgate repair

i have a Rockford Fosgate punch 200ix dsm mosfet amplifier that has blown a resistor and i dont know which one its is, if anyone could help me that would be great ill attach a pic of its location



http://i1313.photobucket.com/albums/...psd8c67300.jpg

Last edited by Likeaboss757; 27th May 2013 at 11:39 PM.
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Old 28th May 2013, 12:07 AM   #2
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That's not a resistor. Its a diode.

It is a 1N4003, they are cheap and easy to find.
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Old 29th May 2013, 03:37 AM   #3
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ty so much and i am sorry i didnt know
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Old 30th May 2013, 07:27 PM   #4
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ok so i replaced it and after an hour or so of playing music it blew again any ideas?
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Old 31st May 2013, 02:00 AM   #5
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When the amp was installed was there any DC voltage on the RCA shield ground?

Have you checked the resistors that are in line and near by to see if any were out of tolerance after you replaced the part?

I will look at the schematic and see what its purpose is.
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Old 31st May 2013, 03:31 AM   #6
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im not that knowledgable with electronic hardware i just know the very basics so any thing you tell me is probably gonna be new to me
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Old 31st May 2013, 12:20 PM   #7
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ok so this time it actually wasnt the diode that i replaced the first time it was this thing

http://i1313.photobucket.com/albums/...psd29513ff.jpg
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Old 31st May 2013, 01:18 PM   #8
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That's the power mosfet, you will have to replace all the IRFZ44's and their gate resistor (it should be around 33-100ohms).

The diode that blew up first is tied to your power control circuit (power supply/ 494 IC & 339) just by looking from the top of the circuit board and following its traces.


Have you checked the outputs and predriver's? They maybe shorted and hence why your power supply took a dump. Did you have a fuse in B+ when testing, if so what rating/amperage?
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Old 1st June 2013, 12:08 AM   #9
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well you kinda lost me on that but i had a 60 amp fuse in when i should have had a 50 i guess and what are the gate resistors?

heres a full picture of the circuit board

http://i1313.photobucket.com/albums/...ps31b8ba54.jpg
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Old 1st June 2013, 12:12 AM   #10
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also is this what i need to purchase?


Amazon.com: IRFZ44N IRFZ44 Mosfet N Channel 49A 55V 20 pcs USA: Everything Else
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