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Old 27th April 2010, 08:27 PM   #1
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Join Date: Sep 2006
Default Rockford Fosgate 250a2

I have this amp in for repair it had a blown output in it IRF540.
I replaced the output. Power light on the amp lights up but no output out of either channel.

Theese are the measurements i got

U1620R
1:0
2:-3.70
3:0

U1620
1:0
2:3.78
3:0

Off the power supply fets
1:13.82
2:13.90
3:0

Outputs
IRF540
1:-3.72
2:0
3:-3.72

9540
1:3.78
2:0
3:3.78

Wondering what i check from here?
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Old 28th April 2010, 01:16 AM   #2
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Join Date: Sep 2009
Location: Wisconsin
Can you check for rail voltage and also the gate signal? Check your .1 ohm resistors for being open, doesn't appear you have rail voltage.

If you need the schematic let me know.
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Old 28th April 2010, 01:46 AM   #3
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Location: Louisiana
The power supply FETs are blown.
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Old 28th April 2010, 02:04 AM   #4
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will the 3205's work in this amp?
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Old 28th April 2010, 02:38 AM   #5
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Location: Louisiana
Yes if the gate resistors are of low enough value. The amp doesn't need anything more than Z44s.
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