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Amplifiers
My PPI PCX-4125 is different inside, and now makes a humming noise.
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<blockquote data-quote="Phoenix" data-source="post: 7113952" data-attributes="member: 625844"><p>First of all I need to admit that I am very new to opening up amplifiers.</p><p></p><p>With that being said, on with my story. I had purchase a PPI PCX-1500 case, so that I could paint it to match my car, then I was going to transfer the insides of the 4125, and have a custom looking piece without ruining my original case. Since I do not plan ahead very well, I did not even thing about the board mounting screws being different, so after taking my 4125 apart, nothing would line up on the 1500 case. I decided to scrap the project and put my 4125 back together.</p><p></p><p>While pulling the board out, I noticed that the lack square things (MOSFETs I believe) had a white paste on them, and then were placed on a pink tape that was glued to the case. Here is where my ignorance comes in. Not knowing how a MOSFET works, I went out and got some conductive paste to place on them and put it all back together.</p><p></p><p>When I reinstalled the 4125 in the car, I could hear a "hum" coming from the speakers, in what I believe sounded like a ground loop. The amp never made this noise before my "surgery".</p><p></p><p>What kind of paste should I use?</p><p></p><p>Also, while comparing my guts to the ones on ampguts, I noticed that there are a metal basr that holds the MOSFETs in place, where mine does not have them. Is this an issue?</p><p></p><p>I'm attaching a picute of mine and a picture from ampguts to compare. Please forgive my crude MS Paint skills.</p><p></p><p><img src="http://img814.imageshack.us/img814/6552/pcx4125guts10.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://img814.imageshack.us/img814/2508/pcx4125guts2.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="Phoenix, post: 7113952, member: 625844"] First of all I need to admit that I am very new to opening up amplifiers. With that being said, on with my story. I had purchase a PPI PCX-1500 case, so that I could paint it to match my car, then I was going to transfer the insides of the 4125, and have a custom looking piece without ruining my original case. Since I do not plan ahead very well, I did not even thing about the board mounting screws being different, so after taking my 4125 apart, nothing would line up on the 1500 case. I decided to scrap the project and put my 4125 back together. While pulling the board out, I noticed that the lack square things (MOSFETs I believe) had a white paste on them, and then were placed on a pink tape that was glued to the case. Here is where my ignorance comes in. Not knowing how a MOSFET works, I went out and got some conductive paste to place on them and put it all back together. When I reinstalled the 4125 in the car, I could hear a "hum" coming from the speakers, in what I believe sounded like a ground loop. The amp never made this noise before my "surgery". What kind of paste should I use? Also, while comparing my guts to the ones on ampguts, I noticed that there are a metal basr that holds the MOSFETs in place, where mine does not have them. Is this an issue? I'm attaching a picute of mine and a picture from ampguts to compare. Please forgive my crude MS Paint skills. [IMG]http://img814.imageshack.us/img814/6552/pcx4125guts10.jpg[/IMG] [IMG]http://img814.imageshack.us/img814/2508/pcx4125guts2.jpg[/IMG] [/QUOTE]
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My PPI PCX-4125 is different inside, and now makes a humming noise.
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