Rockford Fosgate Punch 75HD

seankane · 17th July 2011, 06:56 PM

Hello everyone.

I have a Punch 75HD with a strange issue. I recieved it for repair and it would not power on. Drew 60 amps on my power supply like it was shorted.

I replaced CR9 and CR10 and the amp powered up fine. It sat at idle for about 5 min with no issue, then all of a sudden CR9 and CR10 shorted and started smoking and it was back to drawing 60 amps on my power supply.

What could be causing this issue with CR9 and CR10? They are both IN5336B diodes. Any ideas would be great. Thanks.

Perry Babin · 17th July 2011, 07:36 PM

They are 1N5366, not 1N5336.

seankane · 17th July 2011, 09:43 PM

Yes you are correct I just made a typo. I have about 50 Punch 75hd boards in a pile some look to be ok with nothing wrong but several of them have those two diodes split and burnt.

Was this a known problem?

What causes these diodes to fail, a intermittant transformer problem??

Perry Babin · 18th July 2011, 12:41 AM

This tends to happen when the power supply becomes overloaded and the amplitude of the leakage inductance spikes increases. They're not required and can be left out.

seankane · 18th July 2011, 12:45 AM

What would cause the power supply to be over loaded at an idle? The output fets test ok, and the HBPIM was replaced. I replaced the 4 power supply fets as well.

What disadvantges are there to leaving them out?

Perry Babin · 18th July 2011, 12:49 AM

There shouldn't be spikes at low power or at idle. Do you see excessive ringing or spikes (more than a few volts) on the top of the power supply waveform?

17th July 2011, 06:56 PM	#1
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Rockford Fosgate Punch 75HD Hello everyone. I have a Punch 75HD with a strange issue. I recieved it for repair and it would not power on. Drew 60 amps on my power supply like it was shorted. I replaced CR9 and CR10 and the amp powered up fine. It sat at idle for about 5 min with no issue, then all of a sudden CR9 and CR10 shorted and started smoking and it was back to drawing 60 amps on my power supply. What could be causing this issue with CR9 and CR10? They are both IN5336B diodes. Any ideas would be great. Thanks. __________________ Pyramid 46 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

17th July 2011, 07:36 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	They are 1N5366, not 1N5336. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

17th July 2011, 09:43 PM	#3
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Yes you are correct I just made a typo. I have about 50 Punch 75hd boards in a pile some look to be ok with nothing wrong but several of them have those two diodes split and burnt. Was this a known problem? What causes these diodes to fail, a intermittant transformer problem?? __________________ Pyramid 46 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

18th July 2011, 12:41 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	This tends to happen when the power supply becomes overloaded and the amplitude of the leakage inductance spikes increases. They're not required and can be left out. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

18th July 2011, 12:45 AM	#5
seankane diyAudio Member Join Date: May 2010 Location: Washington State	What would cause the power supply to be over loaded at an idle? The output fets test ok, and the HBPIM was replaced. I replaced the 4 power supply fets as well. What disadvantges are there to leaving them out? __________________ Pyramid 46 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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18th July 2011, 12:49 AM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	There shouldn't be spikes at low power or at idle. Do you see excessive ringing or spikes (more than a few volts) on the top of the power supply waveform? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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