Question about Sharp XL-HP515 CD Shelf System

3 Answers

Sharp xl-dk225 shelf system

Hi there, when I turn on my stereo it sounds great after 15 min there is a small buzz that starts than gets louder untill it's so loud I have to turn it off. I took the top case off to see if I can tell where the buzzing is, it seems to come from a transformer if that is it, how can I quite it? or is it a capacitor in a filter circuit? can't tell which one, or is it something else?????

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  • junbug20 Jul 09, 2008

    Thank you for you r answer, I figured as much, I did turn the volume down your right it still was buzzing, what elsr inside can do this? can I replace the xformer myself?

  • junbug20 Jul 09, 2008

    very helpful! thank Benimur! now where can I get a schematic? I am a tech by trade but I don't work on stereo's thanks again!

  • junbug20 Jul 10, 2008

    Thanks Benimur! I found a manual on manualparadise.com, yea I had
    to pay but not much and was able to download and get it fast, it is the
    xformer, it's a bear trying to find a new one. They did a real sloppy
    job of soldering the xformer on the PCB when I opened the case to get
    a better look, sheesh no pride in there work I guess. If I run into
    another problem I'll certainly look you up! thanks again.
    -junbug20

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3 Answers

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  • Master
  • 6,966 Answers

Hi,

If you have verified that the transformer is the source/cause of the buzz, then chances are that it is a case of loose core. In some, small/long bolts with nuts are used to clamp the core together while other uses a combo or varnish and clamps. Having said this, then the problem is mechanically induced and therefore would require simply tightening of the bolts or clamping the cover/core. It might also be of help to check for any mechanically loose component/object near the transformer;

If the problem is a power supply capacitor, then it would not be a buzz but rather a hum;

If the problem is a small value capacitor in the pre-amp circuitry, then the level of the humming/buzzing sound is controllable through the volume control.

This of course would require a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings. Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified professional.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Jul 09, 2008

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  • Louie  Role
    Louie Role Jul 09, 2008

    Hi again,

    Sorry, as of the moment no free download of the schematics nor the service manual. You may want to try here or here (but it would seem for a fee).

    Again, good luck.


  • Louie  Role
    Louie Role Jul 09, 2008

    A comparable model XL-520W. May not be exactly the same but you may be able to get additional info or wing it from there. Service Manual if available here.

  • Louie  Role
    Louie Role Jul 10, 2008

    Glad to be of assistance and appreciate the rating. Would look forward should you be posting again.

    Cheers.


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  • Master
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Try this when the buzzing is there turn the sound down see if its still there if so then suspect a transformer or something inside and should go back to a factory service center near you.

Hope that helps.....

Posted on Jul 08, 2008

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  • Sharp Master
  • 19,396 Answers

You need to identify the fault using a multimeter

Posted on Jul 08, 2008

  • Ginko
    Ginko Jul 08, 2008

    First you need to test the capacitor and the parts and components related to the area from where the noise comes, presumably the power supply area, and the amp area, which usually can give this kind of problems.
    Once you find the fault replace the part.
    If you need a multimeter, here is one.


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