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Rockford Fosgate M400-4 help
Rockford Fosgate M400-4 help
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Old 6th February 2018, 01:19 PM   #1
rhempz01 is offline rhempz01  United States
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Default Rockford Fosgate M400-4 help

I have a Rockford m400-4 it has audio on 1 of the channels and none of the rest. Ps fets are all good. No shorts in any outputs. Didn't remove them to test them yet. I could use some ideas on what to look for. It has 3205's in the ps. And irfb4227 in the output stage of the amp.
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Old 6th February 2018, 01:21 PM   #2
rhempz01 is offline rhempz01  United States
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It doesn't draw excessive current but it does load down my supply when it is hooked up. From the normal 12.5v to 10.9v?
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Old 6th February 2018, 01:52 PM   #3
rhempz01 is offline rhempz01  United States
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Drive signal for ps is perfect.
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Old 6th February 2018, 08:33 PM   #4
josesony68 is offline josesony68  Spain
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I also have the same damaged amplifier ...

it is not normal for it to go down from 12.5 to 10.9v ..

Do you have a scope?
If you have it, can you check if it has a square waveform in the output gate pins of the fet in the audio channel that works?

check the same on the three remaining channels

Last edited by josesony68; 6th February 2018 at 08:35 PM.
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Old 6th February 2018, 08:47 PM   #5
rhempz01 is offline rhempz01  United States
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Yes I have a scope and the left leg of the output transistor . I should get a sqaure wave there as well?
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Old 6th February 2018, 09:12 PM   #6
rhempz01 is offline rhempz01  United States
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Now I have 1.3a at 12.4vdc. looks good about to test for audio. If you need any measurements, I got u.
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Old 6th February 2018, 09:18 PM   #7
josesony68 is offline josesony68  Spain
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Yes, you should get a square waveform on the left pin of one of the two fets (I'm not sure which one it is, or if it's both) corresponding to the audio channel that works.
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Old 6th February 2018, 09:20 PM   #8
josesony68 is offline josesony68  Spain
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Do the other channels have audio?
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Old 6th February 2018, 09:41 PM   #9
josesony68 is offline josesony68  Spain
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Thank you for offering to help me, in my amplifier I am stuck at the point where I can not see square wave form outside the ps, and I do not know if it really is like this or not ..
Also, I think that pins 11 and 14 of IRS2092S should have a square shape, which I do not have, as in pin 4 I should have a triangular waveform, which I do not have either.

I do not know, I'm lost.
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Old 6th February 2018, 10:27 PM   #10
rhempz01 is offline rhempz01  United States
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No channels have audio just static. Loud buzzz. And I'll check the irfb4227 for you. All of them tested good?
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