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Soundstream XTA-480.2 repair direction
Soundstream XTA-480.2 repair direction
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Old 19th April 2012, 08:15 AM   #1
mlkraft is offline mlkraft  United States
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Join Date: Mar 2012
Location: Mesa, AZ
Default Soundstream XTA-480.2 repair direction

I recently acquired the noted amp as part of a package deal. $30 for 3 amps, one working Jensen, the SS, and a Targa that may or may not be revivifiable.
Being stuffed in a box, the exact number fails to come to mind right now, but there are at least half (4/8?) of the IRFZ44N devices on the PS side that let the smoke out, and one of those (that I recall) has turned the PCB trace into a blown fuse configuration.
I have not been able to find a schematic as yet, and am still looking.
So besides the obvious mosfets, what are the next obvious parts to check?
Tools: a couple basic DMM, one RadioShack unit that does the usual measurements, and one 7 function that has the hfe tester for transistors.

no parts have yet been swapped or exchanged.
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Old 19th April 2012, 09:21 AM   #2
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
The PNP driver transistors and the output transistors need to be checked.
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Old 20th August 2012, 12:28 AM   #3
mlkraft is offline mlkraft  United States
diyAudio Member
Join Date: Mar 2012
Location: Mesa, AZ
Finally got around to it: Everything checked out per DMM tests (output trannies are not matched all that well), swapped out the power MOSFETS, and it powers up and WORKS!!

Thanks Perry.

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