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Old 27th October 2011, 04:21 AM   #1
chipper is offline chipper  United States
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Default 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
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Old 27th October 2011, 04:35 AM   #2
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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.
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Old 27th October 2011, 04:40 AM   #3
chipper is offline chipper  United States
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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.
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Old 27th October 2011, 04:46 AM   #4
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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.
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Old 27th October 2011, 04:51 AM   #5
chipper is offline chipper  United States
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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.
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Old 27th October 2011, 05:04 AM   #6
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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).
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Old 27th October 2011, 05:43 AM   #7
chipper is offline chipper  United States
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You were right! Didn't do a darn thing! Still the same crackling/fart sound. What else should I check next?
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Old 27th October 2011, 06:08 AM   #8
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Does the noise change when you plug the RCAs in?

Does the noise stop if you change the crossover card to full range?
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Old 27th October 2011, 06:44 AM   #9
chipper is offline chipper  United States
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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.
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Old 27th October 2011, 06:58 AM   #10
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Do you have a scope?
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