smoked amp
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=106042
Printed Date: May 06, 2024 at 5:06 AM
Topic: smoked amp
Posted By: gogoquadzilla
Subject: smoked amp
Date Posted: July 10, 2008 at 4:05 PM
Does anyone know where I can get my hands on a schematic for a PPI DCX 500.2 ? I'm repairing my amp and have a couple resistors that are charred too bad to read so I have no idea what they are. PPI tells me they will only give them to their repair shops.
Replies:
Posted By: Alpine Guy
Date Posted: July 10, 2008 at 4:36 PM
Nope, unless you can find one posted on Google, your out of luck.
If you can get a good enough look on here you may be able to find out https://ampguts.realmofexcursion.com/PPI_DCX500.2/
Most likely though, there will be an identical stage on the other side of the amp with the same resistors, such as, say if the resistor that is fried is R114, and there is a resistor on the other side of the board labeled R124, theres a very good chance it's an identical stage, just different polarity.
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2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.
Posted By: gogoquadzilla
Date Posted: July 10, 2008 at 5:11 PM
they're hidden under the pot for the input xover. the resistors come from the rca inputs
Posted By: i am an idiot
Date Posted: July 10, 2008 at 5:24 PM
If they are connected to the shield of the RCA jacks you need to check them with a meter. They are more than likely OK. They run hot. If they are connected to the shield, I think they are 10 ohm 2 watt.
Posted By: gogoquadzilla
Date Posted: July 10, 2008 at 6:05 PM
they crumbled when i touched them. i know it was yellow, maybe blue gray or violet, and the third i cant tell so that rules out 10 ohms, theyre definitely bad, i assume they were the same and they are reading 81 and 177 ohms.
Posted By: i am an idiot
Date Posted: July 10, 2008 at 8:37 PM
They are 47 ohm. Using a meter verify that one end of the resistor goes to the shield of the rca jack. The other end goes to the center tap of the transformers secondary windings. 
Posted By: i am an idiot
Date Posted: July 10, 2008 at 9:41 PM
The above picture is not of a 500.2 It is of the same series, they are all pretty much the same in that area.
Posted By: gogoquadzilla
Date Posted: July 10, 2008 at 11:19 PM
thanks a lot, where did you get that picture? i couldnt find anything like that on ampguts but maybe i wasnt looking hard enough. they are on the shield and i think theres a good chance that third band was black on mine too so i'll try those out. thanks a lot. now i have to figure out what keeps frying my fets on the power side!
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