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Rockford Fosgate M400-4D
Rockford Fosgate M400-4D
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Old 11th October 2017, 05:43 PM   #21
josesony68 is offline josesony68  Spain
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All right, Mario.

+ B and -B, are correct, are + 24.4V and -24.4V

I should investigate further, to see if any regulator is failing ...
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Old 11th October 2017, 05:49 PM   #22
josesony68 is offline josesony68  Spain
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ian, is R769 4,72k?
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Old 11th October 2017, 08:50 PM   #23
MarioRestucci is offline MarioRestucci  Italy
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Quote:
Originally Posted by josesony68 View Post
ian, is R769 4,72k?
Unfortunately I can not see very well.
I do not have an electric diagram to consult.
It seems to me that R769 is equal to R763 (10K), I say it because it seems to be connected to ZD701 and ZD702 respectively.
is a typical resistor + zener configuration, probably to stabilize a lower voltage.
Anyway, I seem to understand that this area is related to the power supply.
Your power supply works fine, so it makes no sense to go looking for something at that point.
Remember, you have a missing trimmer.
It may be useful to adjust the switching frequency fine (in relation to that channel).
If you can understand the value of the other trimmers, you can install a trimmer of the same value in the space where it is now missing.
As you solve the VCC problem, you need to be very careful, as that trimmer will need to be adjusted very well for the same switching frequency of the other channels.
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Old 11th October 2017, 09:32 PM   #24
josesony68 is offline josesony68  Spain
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I have to keep investigating ..

What about the trimmer disappeared, I think it is so in this type of amplifiers, I have seen a picture on the web of a new amplifier identical to this, and this trimmer at that point, is not installed.
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Old 12th October 2017, 02:37 AM   #25
ian33 is offline ian33
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Quote:
Originally Posted by josesony68 View Post
ian, is R769 4,72k?

Amp gone already.

There is no port in that location.
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Last edited by ian33; 12th October 2017 at 02:40 AM.
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