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Old 28th October 2011, 03:40 PM   #1
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Default Sony XM-475GSX

2 OF THE OUTPUTS WERE BAD IN THIS AMP ( Q110,Q109).

DOES ANYONE KNOW THE BOARD LOCATIONS FOR THE DRIVERS FOR THEESE OUTPUTS??


BECAUSE AS SOON AS I REPLACE THEM THEY BURN UP WITHIN 2 SECS
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Old 28th October 2011, 04:04 PM   #2
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I have nothing on this amp but you can find the drivers if you follow the traces back from the base/gate of the output transistors.
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Old 28th October 2011, 04:50 PM   #3
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ok i found them..

There are 4 pots on the board near the outputs.. 1 for each channel ..


Bias pots ?
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Old 28th October 2011, 07:09 PM   #4
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They are probably bias pots. You can determine what they are by adjusting them on a working channel.
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Old 29th October 2011, 03:09 PM   #5
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Is there a good sub for a C4015 transistor ?
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Old 30th October 2011, 09:11 AM   #6
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How is it being used?
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Old 19th November 2011, 05:25 AM   #7
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Ok i replaced the transistor C4015 and replaced the outputs in the defective channel..


Now when i try to power it up the Over current light comes on and shuts the amp down..


If i remove the outputs from the channel it powers up fine..


Any ideas?
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Old 19th November 2011, 05:31 AM   #8
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Are the emitter resistors within tolerance?

If you power it up through a current limiter, does it go into protect?
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Old 19th November 2011, 04:22 PM   #9
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Emitter resistors are within tolerance..


If i try powering it up thru a current limiter the amp will power up but will draw excessive current
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Old 19th November 2011, 04:49 PM   #10
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Ok theres a problem in another channel that i found also..

All outputs are removed and the amp is powerd up thru a limiter and it idles perfect..


The 540's control the negative rail ??
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