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Old 4th September 2015, 10:34 AM   #1
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Default Earthquake Powerhouse D2

Have one here that blew most of the RFP40N10's. Blew 10 amp fuse when I applied power. Cut the legs to all the output fets and now amp light comes on.
What should I check from here?
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Old 4th September 2015, 05:10 PM   #2
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Find and repair the fault then replace the FETs, drivers. and associated damaged components.
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Old 4th September 2015, 11:52 PM   #3
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I'd suggest the IRF3710Z (Z is critical). HIP4080 will likely need to be replaced as well.
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Old 5th September 2015, 04:29 AM   #4
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Thanks for the fet advice. I already have the new HIP4080. What should I see at each of its pins?
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Old 5th September 2015, 10:41 AM   #5
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You cannot check the signals on the IC without the FETs in the circuit unless you short various terminals in the circuit. I don't have a diagram for this amp so I can't tell you which pins to short.
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Old 5th September 2015, 03:40 PM   #6
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Hi Perry,
Does the hip4080 drive the outputs? You recommend a IRF3710Z for output fets will the FQP85N06 be okay on the input side? Do you have a favored substitution for it as well. I think this amp was a modded one. I read the other write up and think I had the 1.5KE68A Zener anti feed back protection diodes at the fets but yet it was still installed on HIP4080 chip legs. It also reads that replacing R08 with a 10ohm and R37 with a 75K will increase the rail voltage.It also reads that changing the internal fuse from 20 to 30 amps will allow over-driving the amp at 1/2 an ohm for SPL applications.

Perry the article suggest needing to check the anti feed back diodes at the same time I check the gate resistors. The resistors should be 10 ohms @ 1%.

Can I begin by looking for driver signals at the TC4424?

Also this photo taken from the web shows a large ceramic resistor in between the speaker outputs and a bipolar 47Uf cap. Where can I find these items and any idea the wattage rating on the ceramic resistor?

Click the image to open in full size.

Last edited by hifonics hugh; 5th September 2015 at 04:06 PM.
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Old 5th September 2015, 04:08 PM   #7
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Can anyone confirm the colors on the ceramic resistor Im asking about?


Your time and patience is greatly appreciated.
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Old 5th September 2015, 11:00 PM   #8
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I will not help modify the amp.

The first color band on the resistor could be either red or brown. It's difficult to see but it's likely a 0.2 ohm. One photo I have shows a 0.47 ohm there. It's likely 2w. Order whatever resistor that matches the dimensions of the one in the amp.

I don't know what an anti-feedback diode is.
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Old 6th September 2015, 01:04 AM   #9
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The resistor is a 0.2 ohm 2 watt..

I have the same amp here on the bench
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Old 6th September 2015, 03:14 AM   #10
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Quote:
Originally Posted by S Merlington View Post
The resistor is a 0.2 ohm 2 watt..

I have the same amp here on the bench
Thank you Mr Merlington. Do you or anyone else have a source for the 100volt bipolar cap?

Thanks again.
Hugh

Last edited by hifonics hugh; 6th September 2015 at 03:25 AM.
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