Question about Sony STR-DA7100ES

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I have a Sony STR DA7100ES amplifier that will not power on.

I am working on a Sony STR DA7100ES amplifier. Shotly after I apply power, the relay picks but then it drops out right after it picks. The unit continues to do this and the display stays dark. Is there a website with fixes listed for this unit?

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  • timonandpumb Dec 04, 2010

    Hello again. I'm the original poster and solved the problem.



    It was an open winding in the Main Power Transformer (T1).

    When I unplugged connector CN14 from the AC DIF board, it measured infinite resistance. The break was where the stranded orange wire was connected to the solid 'winding wire'...



    Hope this helps someone because I spent a lot of time with schematics and a scope to find it.

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SOURCE: sony str-de845 Powers up, relay clicks, fuses BLOW!

This condition, may be produced by defective components (Q506, Q507). you can remove those transistor, replace the fuses, power-on and wait for relays click. if the fuses not blown again, them replace both transistor.

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SOURCE: Sony's STR-DE675 5.1 Channel Receiver - Speaker OFF problem

There's a button that turns the speakers OFF right above the headphone jack.

Get the manual: retrevo.com

Posted on May 21, 2010

Testimonial: "@dunnbiker Very true on assumptions! I've tried everything the manual suggests. Right now, nothing is connected to the unit, but upon power up, I get the SP:OFF display (which is not seen in the DEMO mode). I will try the headphone jiggling idea and see what happens."

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