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Old 28th October 2011, 06:33 AM   #1
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Default Rockford Fosgate Punch 200.4

I have a Punch 200.4 board number PC-3084-A

I am having troubles tracking down some distortion.

I recieved the amp and the power supply was toast and one channel had a shorted output fet. It used the BUZ 272 and BUZ 21 outputs.

I switched them out for IRF540 and IRF9540.

The DC on the bridging terminal went away and the amp powers up fine and idles fine and does not draw current. The 3 and 4 series channels were the ones repaired. The 4 series channel has the problem.

The 3 series channel will bias and puts out clean audio, but the 4 series channel will not bias and it is badly distorted.

Any ideas where to look?
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Last edited by seankane; 28th October 2011 at 06:36 AM.
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Old 28th October 2011, 11:33 AM   #2
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If it has the BUZ transistors, confirm that none are leaking or shorted from the gate to the source. The BUZ transistors often short that way and many people miss the short the first time they check.
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Old 28th October 2011, 04:52 PM   #3
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They have been replaced already with IRF540 and IRF9540.
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Old 28th October 2011, 07:07 PM   #4
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Post a photo of the distorted signal.
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Old 28th October 2011, 11:02 PM   #5
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The first photo is of the 4 series problem channel, and the second photo is what all the other channels look like.
Attached Images
File Type: jpg Punch 200.4 001.jpg (937.4 KB, 116 views)
File Type: jpg Punch 200.4 002.jpg (973.9 KB, 111 views)
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Old 28th October 2011, 11:08 PM   #6
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Almost forgot scope settings were 20vol/2ms
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Old 29th October 2011, 05:17 AM   #7
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Does lifting D401 allow it to produce the top half of the waveform?
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Old 29th October 2011, 06:19 AM   #8
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Old 29th October 2011, 07:37 AM   #9
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With that diode out of the circuit, does the bias work?
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Old 29th October 2011, 08:44 AM   #10
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