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28th October 2011, 06:33 AM
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#1 |
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diyAudio Member
Join Date: May 2010
Location: Washington State
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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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Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch Last edited by seankane; 28th October 2011 at 06:36 AM. |
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28th October 2011, 11:33 AM
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#2 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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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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Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links |
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28th October 2011, 04:52 PM
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#3 |
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diyAudio Member
Join Date: May 2010
Location: Washington State
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They have been replaced already with IRF540 and IRF9540.
__________________
Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch |
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28th October 2011, 07:07 PM
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#4 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Post a photo of the distorted signal.
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Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links |
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28th October 2011, 11:02 PM
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#5 |
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diyAudio Member
Join Date: May 2010
Location: Washington State
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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.
__________________
Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch |
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28th October 2011, 11:08 PM
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#6 |
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diyAudio Member
Join Date: May 2010
Location: Washington State
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Almost forgot scope settings were 20vol/2ms
__________________
Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch |
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29th October 2011, 05:17 AM
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#7 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Does lifting D401 allow it to produce the top half of the waveform?
__________________
Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links |
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29th October 2011, 06:19 AM
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#8 |
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diyAudio Member
Join Date: May 2010
Location: Washington State
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No everything stays the same.
__________________
Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch |
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29th October 2011, 07:37 AM
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#9 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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With that diode out of the circuit, does the bias work?
__________________
Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links |
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29th October 2011, 08:44 AM
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#10 |
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diyAudio Member
Join Date: May 2010
Location: Washington State
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No everything stays the same.
__________________
Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch |
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