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RCA Stereo/ No sound

Discussion in 'Electronic Repair' started by Bob A., Dec 14, 2003.

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  1. Bob A.

    Bob A. Guest

    I have a RCA model RS2600 (5-CD,2Tape deck,radio, all in one cabinet)
    the sound went out! just as if it was muted, however the "mute"
    display is not on? I first tried new batteries in remote to be sure I
    had remote operation, I then tried a Known-Good speaker, I then found
    some info that it might be the IC stereo amp on the board , so I
    replaced it- Still no sound. I obtained the circuit diagram for the
    amp driver (made by ST model TDA7269) it shows Vs at terminals 6 & 9,
    however I am getting only 1.67 volts and chip specs indicate 22 volts,
    I then checked the power supply and it seems good? checked on bench.
    Any help would be appreciated!
     
  2. Jerry G.

    Jerry G. Guest

    Feed in a signal, as such from an audio generator, and follow the signal
    path with a scope. Where the signal stops, is your dead area.

    --

    Greetings,

    Jerry Greenberg GLG Technologies GLG
    =========================================
    WebPage http://www.zoom-one.com
    Electronics http://www.zoom-one.com/electron.htm
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    I have a RCA model RS2600 (5-CD,2Tape deck,radio, all in one cabinet)
    the sound went out! just as if it was muted, however the "mute"
    display is not on? I first tried new batteries in remote to be sure I
    had remote operation, I then tried a Known-Good speaker, I then found
    some info that it might be the IC stereo amp on the board , so I
    replaced it- Still no sound. I obtained the circuit diagram for the
    amp driver (made by ST model TDA7269) it shows Vs at terminals 6 & 9,
    however I am getting only 1.67 volts and chip specs indicate 22 volts,
    I then checked the power supply and it seems good? checked on bench.
    Any help would be appreciated!
     
  3. The output IC is most likely defective, and some of its support
    components along with it. You have to try the IC to test. If the cause
    of it blowing is not fixed, the new one will blow right away.

    Take care that you properly checked the supply. Use a scope to see
    where the audio signal stops along its path to verify.

    Jerry Greenberg
    http://www.zoom-one.com
     
  4. I think there is a transistor on the main board which goes bad on these.
    Near the center of the board, you'd see the overheated area.

    Mark Z.
     
  5. Art

    Art Guest

    RCA has a nack of using low value resistors as fuse devices in these sets,
    when an output device fails or overloads it normally will open the
    associated resistor (fuse).
     
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