rockford punch 40ix weird sound coming from channels

chipper · 27th October 2011, 03:21 AM

Hey i have another project that hopefully won't get the best of me. Anyway i have a punch 40ix pretty nice heavy little amplifier but when its powered up and with only speakers connected to it, it has a weird cracking type sound coming from both channels. I was checking stuff in each channel and i found D7 to be shorted from both sides (A, K, K, A) is this diode suppose to be like this? And i lift it will it change the output?? pls help ha

brandes.cm · 27th October 2011, 03:35 AM

schematic for 60ix here:
https://sites.google.com/site/brande...edirects=0&d=1

D7 should not be shorted, actually all diodes should not be shorted. I believe it offers some protection if the amp is wired incorrectly. Someone more than likely shorted +B to chasis.

chipper · 27th October 2011, 03:40 AM

No not those diodes its near the treble control. I need to know if anything would happen if i lift it? Its shorted and I'm assuming its probably responsible for the channels not playing correctly.

Perry Babin · 27th October 2011, 03:46 AM

That diode is connected between the shield and chassis ground. It shorts when 12v contacts the RCA shield. If you had RCAs plugged into the amp, recheck the diode without having RCAs plugged into the amp.

chipper · 27th October 2011, 03:51 AM

I did right now i took it out of the heat sink and it still reads a dead short either way i check it. Its a 1N4003 diode.

Perry Babin · 27th October 2011, 04:04 AM

Replace it. You know it's defective. Let us know if that solves the problem (it probably won't but you have to change it to eliminate it as a possible problem).

chipper · 27th October 2011, 04:43 AM

You were right! Didn't do a darn thing! Still the same crackling/fart sound. What else should I check next?

Perry Babin · 27th October 2011, 05:08 AM

Does the noise change when you plug the RCAs in?

Does the noise stop if you change the crossover card to full range?

chipper · 27th October 2011, 05:44 AM

First question: it does it regardless if any RCAs are connected or not

Second question: it gets a little lower but is still very audioable and distorted if I try to play music.

Perry Babin · 27th October 2011, 05:58 AM

Do you have a scope?

27th October 2011, 03:21 AM	#1
chipper diyAudio Member Join Date: Oct 2008 Location: Los Angeles	rockford punch 40ix weird sound coming from channels Hey i have another project that hopefully won't get the best of me. Anyway i have a punch 40ix pretty nice heavy little amplifier but when its powered up and with only speakers connected to it, it has a weird cracking type sound coming from both channels. I was checking stuff in each channel and i found D7 to be shorted from both sides (A, K, K, A) is this diode suppose to be like this? And i lift it will it change the output?? pls help ha __________________ Feel the PUNCH

27th October 2011, 03:40 AM	#3
chipper diyAudio Member Join Date: Oct 2008 Location: Los Angeles	No not those diodes its near the treble control. I need to know if anything would happen if i lift it? Its shorted and I'm assuming its probably responsible for the channels not playing correctly. __________________ Feel the PUNCH

27th October 2011, 03:46 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	That diode is connected between the shield and chassis ground. It shorts when 12v contacts the RCA shield. If you had RCAs plugged into the amp, recheck the diode without having RCAs plugged into the amp. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

27th October 2011, 03:51 AM	#5
chipper diyAudio Member Join Date: Oct 2008 Location: Los Angeles	I did right now i took it out of the heat sink and it still reads a dead short either way i check it. Its a 1N4003 diode. __________________ Feel the PUNCH

27th October 2011, 04:04 AM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Replace it. You know it's defective. Let us know if that solves the problem (it probably won't but you have to change it to eliminate it as a possible problem). __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

27th October 2011, 03:35 AM	#2
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	schematic for 60ix here: https://sites.google.com/site/brande...edirects=0&d=1 D7 should not be shorted, actually all diodes should not be shorted. I believe it offers some protection if the amp is wired incorrectly. Someone more than likely shorted +B to chasis.

27th October 2011, 04:43 AM	#7
chipper diyAudio Member Join Date: Oct 2008 Location: Los Angeles	You were right! Didn't do a darn thing! Still the same crackling/fart sound. What else should I check next? __________________ Feel the PUNCH

27th October 2011, 05:08 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Does the noise change when you plug the RCAs in? Does the noise stop if you change the crossover card to full range? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

27th October 2011, 05:44 AM	#9
chipper diyAudio Member Join Date: Oct 2008 Location: Los Angeles	First question: it does it regardless if any RCAs are connected or not Second question: it gets a little lower but is still very audioable and distorted if I try to play music. __________________ Feel the PUNCH

27th October 2011, 05:58 AM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Do you have a scope? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Weird sounds coming from bass guitar	Ivchikx	Instruments and Amps	5	30th September 2011 11:49 PM
Weird sound coming out from my speakers.	motbuddy	Solid State	4	21st June 2010 09:13 AM
rockford punch 500.2	scampo77	Car Audio	26	12th April 2010 02:35 PM
Punch 45 - Weird Problem with Start-up	bigphil	Car Audio	5	30th December 2008 07:59 AM
Rockford Punch 250x2	gti311	Car Audio	6	14th October 2005 07:26 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read