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Panasonic VCR won't play back its own tapes

Discussion in 'Electronic Repair' started by Andre, Sep 27, 2003.

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  1. Andre

    Andre Guest

    Hi group .

    This VCR is a Panasonic nv-sd200.

    This is just weird. If I feed this VCR a pre-recorded tape it works.
    If I feed it a tape recorded on another machine it works.
    If I record a brand new tape it plays back fine on itself and another

    However, if I try and record over an existing recording , the top of
    the picture is distorted and the verticals are unstable.

    Realigned the loose tape guide (using LP tape- works fine) , still no

    It almost looks like incomplete erasure of the very top of the tape,
    but the erase head seems to be OK.


  2. Maybe the full erase head isn't working or is misaligned. Is there
    also a rainbow effect? (Does that happen with PAL tapes when the
    previous recording isn't erased?)

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  3. Lee Blaver

    Lee Blaver Guest

    OT, but there was a model of Hinari VCR (PAL) that suffered from failure
    of the full erase head - and by a quirk of the head design, the previous
    recording could often be seen under a new one at either end of the
    tracking range. Confused me when I first saw it, not that's it's
    diffucult to do that these days :)

  4. Andre

    Andre Guest

    Its possible . It plays back LP recordings fine FWIW.

    BTW, there is a rainbow effect for about 2 seconds during frame
    changes , then it goes away . Also the distortion fades in and out on
    about a 4 second cycle (which could mean the drum is "tape tension
    sensitive" ) .
    When i tried dropping the tape tension it lost half the picture, which
    is a VERY bad sign .

    new drum on order (should have ordered an erase head, just to make
    sure) .

  5. Andre

    Andre Guest

    38V on the full erase head - so that's OK . :) measures 1.6 ohms on my meter .
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