Question about Sharp CD-ES770 Shelf System

6 Answers

Powers-up no sound not even through head phones

I own a Sharp CD-ES770 sound system. I put it on and it power-up, display came on, but when i turn the volume nob..no sound! not even through the headphone port! I have changed the main IC module and the two transistors next to it and still no sound. What could possibly be wrong here?

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  • I own a Sharp CD-ES770 sound system. I put it on and it power-up, display came on, but when i turn the volume nob..no sound! not even through the headphone port! I have changed the main IC module and the two transistors next to it and still no sound.I have also noticed that when i remove the speaker wire or one side of it, the little fan at the back begins to spin, when i put in the speaker wire again it doesn't. What could possibly be wrong here?

  • I do hear a clicking sound. when i check the impedence at the speaker terminal it does not read 4-8 ohms. i need specific info to pin-point this problem.

  • I own a Sharp CD-ES770 sound system. I put it on and it power-up, display came on, but when i turn the volume nob..no sound! not even through the headphone port! I have changed the main IC module and the two transistors next to it and still no sound.I have also noticed that when i remove the speaker wire or one side of it, the little fan at the back begins to spin, when i put in the speaker wire again it doesn't. I am also hearing a clicking sound through the headphone. What could possibly be wrong here?

  • Have no service manual for this Sharp Cd-Es770. Could someone assist me in acquiring it?

  • I own a Sharp CD-ES770 sound system. I put it on and it power-up, display came on, but when i turn the volume nob..no sound! not even through the headphone port! I have changed the main IC module and the two transistors next to it and still no sound.I have also noticed that when i remove the speaker wire or one side of it, the little fan at the back begins to spin, when i put in the speaker wire again it doesn't. What could possibly be wrong here? If a service manual is absolutely necessary could someone kindly assist me in obtaining one.

  • I have checked the solder joints and its good. Its not muted either. caps are good too.

  • I own a Sharp CD-ES770 sound system. I put it on and it power-up, display came on, but when i turn the volume nob..no sound! not even through the headphone port! I have changed the main IC module and the two transistors next to it and still no sound.I have also noticed that when i remove the speaker wire or one side of it, the little fan at the back begins to spin, when i put in the speaker wire again it doesn't. What could possibly be wrong here?

  • Thanks for the link, but its not free. I need a free download. Seems like everything these days are costly.

  • I own a Sharp CD-ES770 sound system. I put it on and it power-up, display came on, but when i turn the volume nob..no sound! not even through the headphone port! I have changed the main IC module and the two transistors next to it and still no sound.I have also noticed that when i remove the speaker wire or one side of it, the little fan at the back begins to spin, when i put in the speaker wire again it doesn't. What could possibly be wrong here?

  • Actually i paid fiya 9.99. so i did expect a little more than i already know. No offence to anyone.

  • Selector not muted.

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6 Answers

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  • Master
  • 700 Answers

Is the solector Mute? or maybe the unit is sensing that the speakers are not connected correctly.

Posted on Dec 21, 2008

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  • Master
  • 2,035 Answers

You can use this link to get the service manual :

http://www.nodevice.com/manual/newmans/upsharp/CDES770PDF/get53292.html


Good luck...

Posted on Dec 21, 2008

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  • Master
  • 916 Answers

Check the to make sure burnt and broken solder joints on the mainboard. However, since you're getting some power to some of the unit's functions, I doubt this is the problem but it is always good to check.

Second, make sure the mute button isn't engaged. I know it sounds stupid but I've made this mistaken myself before.

If either of those doesn't work, you need to take the unit in to a qualified repair service for a bench test.

Posted on Dec 21, 2008

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  • Master
  • 10,594 Answers

Give audio signal to its AUX input and check any sound in speakers.

I would recommend to have service manual to rectify / diagnose problem systematically.

Posted on Dec 21, 2008

  • Shahid Electronics
    Shahid Electronics Dec 21, 2008

    Please remove speaker wires from connector and check any DC voltage on speaker terminals of system.
    I already gave you service manual web link, see above blue colored Service Manual.

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  • Master
  • 6,966 Answers

Hi and welcome to FixYa,

Initially, pls to check the continuity of the speaker/speaker wires. Each speaker should measure 4 or 8 ohms but never 0 or infinity. Additionally, pls check:

  • do you hear any clicking sound;
  • double check the audio source, tuner, CD;
  • try disabling/normal mode any sound processing.
At this stage, your best bet would be to perform voltage and resistance checks while referencing a service manual or at least the schematic diagram with voltage readings. Other possibilities (to be verified with the diagram) are:
  • power supply voltages;
  • source selector, possibly a digital/logic switching.
Good luck and Thank you for using FixYa. Happy Holidays.

Posted on Dec 21, 2008

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  • Sharp Master
  • 19,396 Answers

Do not replace any component if you do not have any evidence that is defective. You may make things worse.

Look for bulged capacitors, trace of burnt and broken solder joints on the mainboard, check also that the volume variable resistor is working, read impedance.

Posted on Dec 21, 2008

  • 7 more comments 
  • Ginko
    Ginko Dec 21, 2008

    More , if you have no sound through the headphone port, check the preamp circuits, the final section of the amp is usually fine, as headphone signal is only preamped.

  • Ginko
    Ginko Dec 21, 2008

    If you hear a clicking sound, that means the unit is on protection, if you do not know what protection is , that means that you should not service this unit, as you can cause more damage, and make the unit dangerous for yourself and others.

    The clicking sound is the safety switch as the protection circuit detected a fault and kicked in.

    If you have never seen a unit on protection before, that means that when you replaced main IC module and the two transistors next to it (on what basis?) you probably damaged the unit more.

    I am telling you this in complete sincerity, even if this unit was to be scrapped, you should not service electronics without taking a course or practicing in a workshop under supervision.

    Sincerely.

    G.




  • Ginko
    Ginko Dec 21, 2008

    You can buy the service manual download here for a small fee: Sharp - CDES770 Service Manual.

    See the section troubleshooting diagrams.


  • Ginko
    Ginko Dec 21, 2008

    "when i remove the speaker wire or one side of it, the little fan at the back begins to spin" : probably a short, check that no wiring is shorting to the chassis. Remove the speakers, if one of the speakers had shorted inside you get protection mode, and unit not starting.

  • Ginko
    Ginko Dec 21, 2008

    There is no free download for the service manual, and you are having support from more than one qualified technician, here, and also from few good users.

    I am starting to think that you are also are trying to get a free service from us. Is this true?


  • Ginko
    Ginko Dec 21, 2008

    I will try to block any possible refund, I can see you are not a technician but you did a lot of repairs.

    Let me know if you need any further help, thanks for using Fixya.


  • Ginko
    Ginko Dec 21, 2008

    Dear user, I saw that you did so many complicate repairs on many different devices, then I wonder why when I talk to you, I have the sensations that you do not have much practice.

    The service manual here costed few $$ (I think $3) that is more than a reasonable amount Service Manual..

    I must also tell you that the information given on Fixya must normally not be shared on web or published elsewere.

    Thanks.


  • Ginko
    Ginko Dec 21, 2008

    Hi there , I have seen the original problem here:

    http://www.fixya.com/support/t1220576-sh...


    To start you need the service manual Service Manual. You can get from the link for a couple of dollars.

    Then follow my advice:

    This

    "The fan spins only if i take out the red or black speaker wire and as soon as i insert it, it stops again."

    means that either one of the speakers is shorting inside, or there is something shorting to the chassis, where the output board connecting to the speakers is in contact with the chassis.

    Try different speakers first.

    Look for any object that can carry electricity and is shorting to the chassis, that was the original problem. check for example control knobs and connection boards.

    The idea of replacing the IC was crazy, probably the original problem was just a faulty speaker or a short, now there may be more faults.

    I do not know if you are practicing with electronics , or helping someone else, but a bad serviced electronic can endanger your life.

    Hope this had benn helpful in one way or the other.

    Bye, and good luck.




  • Ginko
    Ginko Dec 21, 2008

    One last note id about your DIY activity.

    I think your willing to learn is a great quality, but you cannot go straight to practice and do complicate repairs on electronics, like replacing a flyback inverter on TV.

    Try to get a good repair course as soon as possible, or try entering into a local workshop as an apprentice, using the skills you got doing this first repairs, doing this job you need to have the necessary theory, before starting to practice.

    Hope I did not seem to rude, but that is the truth.

    Here you get some general hints and tips.

    Read also: Notes on Safety


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