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Issues with the stereo tuner TEAC T-X120

Discussion in 'Electronic Repair' started by TFranco60, Mar 22, 2007.

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  1. TFranco60

    TFranco60 Guest

    Hi everybody,

    I'm trying to fix a stereo tuner TEAC T-X120 I've received from a friend of
    mine,
    this tuner shows issues when in FM:

    1. The automaic search of the FM radio stations seems not to work, you can
    eventually
    start it, the receivers seems to run thru the FM frequencies, but no station
    found/tuned.

    2. You can tune manually a radio station only in MONO, if you try to switch
    to STEREO
    the receiver stays silent, the STEREO leds stays down, nothing can be heard
    then.

    Obviously I've used a new FM dipole, no changes... Any clues/advices ?
    Thank you all and hi from Italy.

    Franco.
     
  2. The discriminator adjustment is off. This is actually a very common problem
    for digital tuners. There are two discriminator adjutments in a typical
    tuner. One adjusts the station centering (I suppose you could call it a
    "zero-cross" point), the other affects the distortion more. For this reason
    this alignment should be done in a shop by a qualified tech. In rare cases
    an out-of-spec 7.2 mHz crystal could cause the same symptom.

    Mark Z.
     
  3. TFranco60

    TFranco60 Guest

    Mark,

    that was it... thanks to a friend of mine who helped me with his
    oscilloscopen we could easily fix the issue and now the tuner is back to
    life.
    Thank you so much !

    Franco.
     
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