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Old 17th March 2012, 03:36 AM   #1
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Default Rockford Fosgate P300-1

Anyone know the value of the gate resistors in this amp?
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Old 17th March 2012, 05:33 AM   #2
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Power supply or output section?
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Old 17th March 2012, 01:26 PM   #3
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Power supply gate resistors
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Old 17th March 2012, 07:59 PM   #4
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Depending on the year, they had a few variations. I have a few P3001 parts boards from 2005 and they all use 60.4 ohm gate resistors.

Those are a metric package size I believe. Similair to 0805 size but they use a different number as a package size.

0805 = 0.079 x 0.049 in. typical power rating is 0.125 watts

2012 = 2.0 x 1.25 mm typical power rating is 0.125 watts

The 2012 metric is equivalent to the 0805 standard.

Either way 60.4 ohms is what you need.
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Old 21st March 2012, 07:37 PM   #5
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I just got the new fets and gate resistors..

I soldered in the new gate resistors and wanted to check the gate signal before putting the new fets in..


Should i have 5 volts on both gate pads for the fets ?

Im only seeing 5 volts on 1 of the gate pads (Q1090)

Q1001 doesnt have 5 volts and isnt showing a squarewave on it as well..

So wondering if this is normal for this amp or do i need to trace the circuit back ?
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Old 21st March 2012, 08:14 PM   #6
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Nevermind i found the problem ...


Q104 and Q106 were defective on the driverboard ..
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