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Sony STR- DE315 Transformer Voltages

O.K. I got a schematic and to start I know to check the voltages coming out of the transformer. I cant find the voltages anywhere on the schematic. Does anybody know where I can find them, this is the first thing to check and I don't know what they are supposed to be.

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  • 12 more comments 
  • democratsorg Jan 08, 2009

    Now I just checked voltage again at the line in and it is 30V AC, what would pull that down? Yesterday it was 120V AC and no power from the standby board to the primary side of the main transformer.

  • democratsorg Jan 08, 2009

    Are you referring to the 2 large capacitors on the main board?

  • democratsorg Jan 08, 2009

    No power to either side of those caps. Would a bad transformer pull the line in voltage down, that is the first component after the line in connector and then the relay?


  • democratsorg Jan 09, 2009

    where can I get the part # 1-450-358-11?


  • democratsorg Jan 09, 2009

    o.k. i sent it fro my gmail account

    william Dem.

  • democratsorg Jan 09, 2009

    Sorry, I did not know you were available right away. I removed CN801 from primary board. I checked standby transformer voltage at CNP802 and it was dead. There is no sound at the relay when I plug it in or push the power button on.

    When is a good time to get together online to help me?


  • democratsorg Jan 12, 2009

    Yes, I did checked it like you instructed and had power in and no power out. Where can I get the part # 1-450-358-11?

  • democratsorg Jan 13, 2009

    Great and thanks for the help, really. I am in U.S.A. and that's why we have a hard time to meeting you online. I need to know the voltage values for that transformer. I can not find them on the schematic. I think I will try to replace with a non sony part, because if it were available it would cost more than it is worth. This is my Mothers unit and she asked me to look at it for her.

  • democratsorg Jan 14, 2009

    I removed the transformer and checked the ohms. The primary was .271K and the secondary was 3.5.

  • democratsorg Jan 15, 2009

    12 volts AC or DC?

  • democratsorg Jan 19, 2009

    Did you get my last message? Is it 12 volts AC or DC?


  • democratsorg Jan 20, 2009

    I know primary is, what is the output AC or DC?

  • democratsorg Jan 21, 2009

    I researched that transformer and I think it is a 120vac to 12vac, does that look correct?

  • nuwan chinthaka
    nuwan chinthaka May 11, 2010

    is the mains smoothing condencer hold the charge when you turn off the power?????


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Yes primary smoothing capacitors it place just after the rectifires.

Posted on Jan 08, 2009

  • 5 more comments 
  • nuwan chinthaka
    nuwan chinthaka Jan 09, 2009

    we can assume that means no storage in condencers,working primary section.

    ok lets get start.please check output side for short circuit.any voltage regulator or regulating circuits are can be short circuit.specialy check fusabele resistors(bleeders) semiconductor fuses ,zener diodes rectifing diodes first.can you upload the smatic diagrm or mail it to i will deffinitly solve your problem.

    best regards


  • nuwan chinthaka
    nuwan chinthaka Jan 09, 2009



  • nuwan chinthaka
    nuwan chinthaka Jan 09, 2009

    WHATS GOING ON........

  • nuwan chinthaka
    nuwan chinthaka Jan 12, 2009



    ok no stanby transformer power means no standby circuit functioning.remoove cnp802 and check the input ac120 and output agin .is input there and no output its simple bad transformer...thats it.

    are you online.if you can call me please donot histitate to call me.any time my mobile number is 00940772532280.

    are you on line.

  • nuwan chinthaka
    nuwan chinthaka Jan 13, 2009

    very sory pal im living in sri lanka and i have no idea about this.but try original sony company or call dealer.also youcan replace this by another type transformer same voltage and same wattage.

    before doing this finalized the transformer burnt out.check the ohms of primary and secondary side.

    primary is to be very high ohms and secondary must be very low.


  • nuwan chinthaka
    nuwan chinthaka Jan 15, 2009

    ok try .

    i think its 12 volts .

  • nuwan chinthaka
    nuwan chinthaka Jan 20, 2009

    its AC .transformers are all AC.go ahed.

    and come with good results.



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