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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
    machine.

    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
    go.

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

    Anyone?

    _A
     
  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 :)

    Lee
     
  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) .

    -A
     
  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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