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Old 20th August 2010, 04:10 AM   #1
diyAudio Member
Join Date: Jun 2010
Default sound stream xta720.4 *protect

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

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
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Old 20th August 2010, 04:23 PM   #2
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Join Date: Nov 2003
Location: Louisiana
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.
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Old 27th August 2010, 03:32 AM   #3
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Join Date: Jun 2010
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 thinking of leaving this amp with one side working any ideas??/????????? i also change the transformer but still no change

Last edited by ian33; 27th August 2010 at 03:35 AM.
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Old 27th August 2010, 04:06 AM   #4
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Join Date: Nov 2003
Location: Louisiana
Did you try to get the schematic diagram for it?
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Old 29th August 2010, 06:52 PM   #5
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Join Date: Jun 2010
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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