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memphis pr200.2 problem

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=125941
Printed Date: July 03, 2025 at 5:58 AM


Topic: memphis pr200.2 problem

Posted By: monitor2
Subject: memphis pr200.2 problem
Date Posted: January 30, 2011 at 5:02 PM

Hi im a new member and i need help my neighbor gave me this amp to start off my system he said it might or might not work because it didnt a while back but i tried it and its still doing the same thang when i turn it on it Goes into protect. It goes off protect when gain is turned all the way down. any help is appreciated.



Replies:

Posted By: i am an idiot
Date Posted: January 30, 2011 at 5:07 PM
The amp has one or more shorted output transistors.   Connect only the power, ground and the remote turn on wires.  If it still has this problem, it will be a simple repair. 



Posted By: monitor2
Date Posted: January 30, 2011 at 5:10 PM
thnak you i will check this out in a little bit



Posted By: monitor2
Date Posted: January 30, 2011 at 7:52 PM
I checked inside my amp there is a white rectangle thing two of the three connections were not connected by solder what is that and could that be my problem



Posted By: i am an idiot
Date Posted: January 30, 2011 at 8:13 PM

Yes that could be your problem.  That problem only shows up if you run signal into the amp.  That is why I wanted you to connect only power ground and remote to see if it still did the same thing.  Reconnect the connections and see what happens. 

The device is the emitter resistor.  There are 2 resistors in that one case.

posted_image

This is not the value of your resistor. This is only to confirm that we are talking about the same part.




Posted By: monitor2
Date Posted: January 30, 2011 at 8:14 PM
ok i will try that i was about to post picture thank you



Posted By: monitor2
Date Posted: January 30, 2011 at 8:38 PM
Do you know where i can buy one of these



Posted By: i am an idiot
Date Posted: January 31, 2011 at 9:15 PM
What is the value of the one in your amp?  .1, .22, .33Ohm?



Posted By: monitor2
Date Posted: January 31, 2011 at 10:21 PM
.15 Ohm



Posted By: monitor2
Date Posted: February 05, 2011 at 5:23 PM
This came out of a Memphis Pr 200.2
posted_image
I was told it was an emitter resistor but not sure. Also would like to know the place i can get another if possible.
Sorry the picture is bad quality the writing on it is:
MPR 55F
0.15ŁKX2
DAE LIM

-------------



Posted By: monitor2
Date Posted: February 05, 2011 at 6:38 PM
***MPR 55F
0.15OhmsKX2
DAE LIM***

Not

MPR 55F
0.15ŁKX2
DAE LIM



Posted By: i am an idiot
Date Posted: February 05, 2011 at 9:00 PM
I see that the 2 left legs are slightly shorter than the right leg,  but I am sure that there is still enough leg left to be able to reattach that part.  Straighten the bend out of the left leg, clean all 3 holes and reinsert the part and resolder it.



Posted By: monitor2
Date Posted: February 05, 2011 at 9:32 PM
i did this and im gonna test it out tomorrow thanks



Posted By: monitor2
Date Posted: February 06, 2011 at 1:48 PM
ok it still goes in protect the power light isnt on but just protect light



Posted By: i am an idiot
Date Posted: February 06, 2011 at 6:35 PM
Do you have a multimeter?  If so, set it to the diode test function, and check the 4 larger devices that are mounted to the heat sink.  They are the heat sink mounted devices that are very near the resistor you are working with.  Check from leg 1 to 2, then leg 1 to 3, then leg 2 to 3.  Check each of the 4 transistors, one of them will read very near 0.000.  If you do have one that reads much lower than the others, chances are it is defective.  I am pretty sure they use TIP 35C and TIP 36C. 



Posted By: monitor2
Date Posted: May 30, 2011 at 8:14 PM
hello i forgot i had this. i just happened to try to hook this amp up and it still didn't work so i was looking at the posts and was wondering how to test the output transistors to see which ones work and don't i hooked up the ground power and remote and it still went to protect and noticed on a reply that if it still has the problem it will be an easy fix.



Posted By: monitor2
Date Posted: May 30, 2011 at 9:15 PM
sorry i guess i didn't look at them all i will see if i can buy a multimeter since i don't have one


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