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Rockford Fosgate M400-4D
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Old 14th November 2017, 06:45 AM   #31
MarioRestucci is offline MarioRestucci  Italy
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To test your 7905 you can apply a 12v input, and without any other external component, you can check if you have 5volt output.
Anyway, I think it's unlikely 7905 defective.
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Old 27th November 2017, 07:00 PM   #32
josesony68 is offline josesony68  Spain
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7905 have been replaced by new ones.

In pin 10 of IRS2092S I have -26.83v measured with black tip in -B and red tip in pin 10.
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Old 28th November 2017, 07:08 AM   #33
MarioRestucci is offline MarioRestucci  Italy
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Quote:
Originally Posted by josesony68 View Post
7905 have been replaced by new ones.

In pin 10 of IRS2092S I have -26.83v measured with black tip in -B and red tip in pin 10.
you must have 12/15v at this point.
Check VCC regulator!
The negative voltage that you have measured is because the vcc is obtained from negative rail.
7905 and 7805 are probably used to generate VAA and VSS that are respectively +5v and -5v.
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Old 6th February 2018, 09:11 PM   #34
josesony68 is offline josesony68  Spain
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VCC regulator 7812 measured with black tip in B- are:
in: -11,4
ground: -26,7
out: -14.5

Now, measured with black tester tip in ground of the regulator I have:
in: 15.29v
out: 12,23v

I think this regulator is in perfect condition
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Old 7th February 2018, 08:08 AM   #35
MarioRestucci is offline MarioRestucci  Italy
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Quote:
Originally Posted by josesony68 View Post
VCC regulator 7812 measured with black tip in B- are:
in: -11,4
ground: -26,7
out: -14.5

Now, measured with black tester tip in ground of the regulator I have:
in: 15.29v
out: 12,23v

I think this regulator is in perfect condition
of course
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Old 7th February 2018, 09:16 PM   #36
josesony68 is offline josesony68  Spain
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So, do you think I should think that all IRS2092S may have failed?

I think I should see a square waveform on pins 11 and 14 (to my mind) in the same way a triangular waveform on pin 4
I'm right?
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Old 4th March 2018, 06:51 PM   #37
josesony68 is offline josesony68  Spain
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I keep spinning ...
I can not find the fault ...
In the end, I'll end up throwing the amplifier in the trash ..
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Old 29th March 2018, 05:27 PM   #38
josesony68 is offline josesony68  Spain
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At last!
You were right, Mario

I replaced all the IRS2092 ICs and managed to see square waveform in my scope on all the gate pins of the output fet.
I tried the amplifier with audio, and perfect sound on all channels.

I do not know why my head did not understand that these IC'S could be in bad condition, I also thought it strange that the four had failed, but it was like that.

Thanks MarioRestucci for your help.
Big!!
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Old 30th March 2018, 08:24 AM   #39
MarioRestucci is offline MarioRestucci  Italy
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Probably, you had a problem with the regulated power lines (WHICH ARE IN COMMON WITH ALL IRS2092) which in one stroke damaged all ICs, then you solved the problem and then you had to replace ICs.
Perfect like that!
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