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-   -   sound stream xta720.4 *protect (http://www.diyaudio.com/forums/car-audio/172212-sound-stream-xta720-4-protect.html)

ian33 20th August 2010 04:10 AM

sound stream xta720.4 *protect
 
hi
am working an a amp sound stream xta720.4,it comes on and stays in to protection mode.somebody had already try to repair this amp befor i get it.i test for shots and leaks i did not find any so i took some voltage test

pwm ic
1=.5
2=4.9
3=4.8
4=.1
5=1.5
6=3.4
7=.0
8=15.8
9=.0
10=.0
11=15.7
12=15.1
13=4.9
14=4.9
15-4.9
16=12.1

from g terminal to center of irfz44s=15.0
)))))))))))))))))))))))first leg=.0
)))))))))))))))))))))))third leg=.0


i change the pwm ic and the 4558d with no change
any kind of help will be good
thanks

Perry Babin 20th August 2010 04:23 PM

Have you checked the outputs to see if any are shorted?

If there are no shorted outputs, get the schematic diagram from SoundStream and email me a copy of it.

babin_perry@yahoo.com

ian33 27th August 2010 03:32 AM

i did not get the schematic but i am still tryin to fix this amp
now after i unsolder the two legs of one of the input transformer the amp will not go into protect again befor i did that the voltage on the input of both transforms is 15v and the output is 6.5v i dont no y is that.am thinking of leaving this amp with one side working any ideas??/????????? i also change the transformer but still no change

Perry Babin 27th August 2010 04:06 AM

Did you try to get the schematic diagram for it?

ian33 29th August 2010 06:52 PM

i did not get the schematic after days tryin to fix this amp i started to switch parts i change all the mosfet in the power supply and three small transistor witch i think is use for the buffer now the amp works ok.i think the transistors only break down when voltage is apply to them cause they tested ok with my meter


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