Rockford Punch 100ix

seankane · 16th March 2011, 12:07 AM

Hello this is my first post. I have a old rockford punch 100ix that I am repairing. The original problem was weak sound in one channel and a delay in the sound coming on. I replaced all the IRF540 output fets, I replaced the gate drivers, I replaced the emitter resistors, and still the same problem. The bias sets on the channel fine like it should. Usually when one of the surface mount components go bad it makes static or draws current. This amp does not draw current or make static, just weak sound in one channel. Something else though when you turn the amp off then back on it takes about 30 seconds for the sound to come on again. Possibly the pwm chip TL594C or the LM339?? Any help would be great.....thanks

Perry Babin · 16th March 2011, 03:45 AM

Is the sound in the weak channel perfectly clean?

Do you have a scope?

seankane · 16th March 2011, 08:54 PM

Its hard to tell if its totally clean but to my ear it sounds clean just alot less output than the other channel. Yes I have a tec 465b dual channel but I am not very familiar with it and unsure what settings to use or exactly how to use it. I am self taught and have been reparing for about 7 years now speacializing in fosgate. I have always used my fluke 787 for everything. I would appreciate any help I could get. Thanks again....Sean

Perry Babin · 16th March 2011, 09:49 PM

Look at the output with the scope. Start with 2mS on the timebase and 5v/div on the vertical amp. If you can't get a locked trace, post a photo of the front of the scope showing the settings for all of the switches.

seankane · 17th March 2011, 03:41 AM

Ok thank-you Perry but how do I post pics on the forum? Please let me know and I will post a pic of my scope.

seankane · 17th March 2011, 06:29 AM

Can anyone tell me how to post pics on the forum?? Anyone??

Perry Babin · 17th March 2011, 07:16 AM

Click the 'Go Advanced' button below. On the next page, scroll down and locate the 'Manage Attachments'.

seankane · 17th March 2011, 07:57 AM

I keep getting an error message and it wont let me upload maybe my internet?

Perry Babin · 17th March 2011, 09:23 AM

Look carefully at the dialog box after the file fails to upload. There's generally an indication of why it won't upload. Generally it's due to files that are too large.

seankane · 17th March 2011, 05:28 PM

If this is the case how do I shrink them down?

16th March 2011, 12:07 AM	#1
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Rockford Punch 100ix Hello this is my first post. I have a old rockford punch 100ix that I am repairing. The original problem was weak sound in one channel and a delay in the sound coming on. I replaced all the IRF540 output fets, I replaced the gate drivers, I replaced the emitter resistors, and still the same problem. The bias sets on the channel fine like it should. Usually when one of the surface mount components go bad it makes static or draws current. This amp does not draw current or make static, just weak sound in one channel. Something else though when you turn the amp off then back on it takes about 30 seconds for the sound to come on again. Possibly the pwm chip TL594C or the LM339?? Any help would be great.....thanks

16th March 2011, 03:45 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Is the sound in the weak channel perfectly clean? Do you have a scope? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

16th March 2011, 09:49 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Look at the output with the scope. Start with 2mS on the timebase and 5v/div on the vertical amp. If you can't get a locked trace, post a photo of the front of the scope showing the settings for all of the switches. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

17th March 2011, 07:16 AM	#7
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Click the 'Go Advanced' button below. On the next page, scroll down and locate the 'Manage Attachments'. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

17th March 2011, 09:23 AM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Look carefully at the dialog box after the file fails to upload. There's generally an indication of why it won't upload. Generally it's due to files that are too large. __________________ 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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16th March 2011, 08:54 PM	#3
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Its hard to tell if its totally clean but to my ear it sounds clean just alot less output than the other channel. Yes I have a tec 465b dual channel but I am not very familiar with it and unsure what settings to use or exactly how to use it. I am self taught and have been reparing for about 7 years now speacializing in fosgate. I have always used my fluke 787 for everything. I would appreciate any help I could get. Thanks again....Sean

17th March 2011, 03:41 AM	#5
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Ok thank-you Perry but how do I post pics on the forum? Please let me know and I will post a pic of my scope.

17th March 2011, 06:29 AM	#6
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Can anyone tell me how to post pics on the forum?? Anyone??

17th March 2011, 07:57 AM	#8
seankane diyAudio Member Join Date: May 2010 Location: Washington State	I keep getting an error message and it wont let me upload maybe my internet?

17th March 2011, 05:28 PM	#10
seankane diyAudio Member Join Date: May 2010 Location: Washington State	If this is the case how do I shrink them down?

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