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Rockford Fosgate M400-4 help
Rockford Fosgate M400-4 help
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Old 6th February 2018, 10:30 PM   #11
rhempz01 is offline rhempz01  United States
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Ok tommorow morning I put that amp back on the bench anch scope all those pins and legs of the outputs. Is that what those I/c are for each channel? It has all that paint or whatever it is. It stinks to soder on it. We'll figure it out. Man I just sold a good one too!!
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Old 6th February 2018, 10:39 PM   #12
josesony68 is offline josesony68  Spain
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oops !! I thought I understood that one of the channels worked ..
What voltage do you have at the speaker output terminals?
Have you checked if the voltage on the pre-amplifier card is + 5 / -5v?
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Old 6th February 2018, 10:41 PM   #13
josesony68 is offline josesony68  Spain
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Ok, tomorrow we continue, it's also late here, greetings.
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Old 6th February 2018, 11:01 PM   #14
rhempz01 is offline rhempz01  United States
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No I have not what pins should I test? And I haven't shipped out the working unit yet if you need something from it I can crack it.
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Old 6th February 2018, 11:03 PM   #15
rhempz01 is offline rhempz01  United States
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Isn't the op amp board marked? Where it should have -5+5?
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Old 6th February 2018, 11:39 PM   #16
rhempz01 is offline rhempz01  United States
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I'll open the new amp and get you some pictures of the waves on the outputs, as well as the I/c's.
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Old 7th February 2018, 09:00 PM   #17
josesony68 is offline josesony68  Spain
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+ 5 / -5v should you have on the output pin of the IC703 and IC704 regulators (7805 and 7905)

Yes, it would be great, if you have an identical amplifier that works, we can take it as a base to find the problems in the damaged amplifiers.
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