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Cassette Deck drive bands

Discussion in 'Electronic Repair' started by N_Cook, Jul 7, 2012.

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  1. N_Cook

    N_Cook Guest

    I still regularly replace them for people (tends to be with silicone rubber
    bands )
    This week something I did not know - found while trying to make sense of
    strobing a capstan to set the motor speed. An Aiwa with rotatatable head for
    playing the "reverse" side of the tape. Spindle to one capstan was 1.49mm
    diameter and the other 1.69mm and proportional size difference to the
    capstans, driven by the same band. I'd measured one spindle and then marked
    ,for strobing, the other capstan. Both decks , Rec/Play & play ,this same
    mechanical disparity
     
  2. N_Cook

    N_Cook Guest

    Another oddity with this 1992 Aiwa AD WX888 - end of tape sensor. Instead of
    a follower that moves with increase of tension in the tape. This uses the
    same small holes in the cassette but is a fixed lump of plastic with 3 wires
    coming from it, not coils. Capacitively somehow sensing motion or change in
    capacitance of ferrite tape to leader transistion ?
     
  3. Tim Schwartz

    Tim Schwartz Guest

    Are the flywheels that the motor belt goes around different diameters?

    Regards,
    Tim Schwartz
    Bristol electronics
     
  4. This week something I did not know -- found while
    What you mean is that the diameter of the "flange" (or whatever) at the base
    of the capstan, which is driven by the same belt, varies so that each
    capstan moves the tape at the same linear speed.

    If the tape is driven by both capstans at the same time (and I assume it
    is), then one capstan is designed to turn ever-so-slightly faster so that
    the tape is held under tension.

    It's not clear what happens when the tape reverses direction. However, my
    Nakamichi used this system, and the tape didn't go spilling into the deck's
    innards when it was reversed.
     
  5. Another oddity with this 1992 Aiwa AD WX888 - end of tape sensor. Instead
    of
    Light, probably. The leader reflects more light than the tape.

    I've never heard of ferrite-coated tapes.
     
  6. N_Cook

    N_Cook Guest

    I wouldn't say it was a slight difference as in the ratio of 1.49 to 1.69
    but not such a large difference I had noticed in general handling.
    Probably specious accuracy as I did not remove them for good perpendicular
    measurement but 44.86mm and 48.79mm of the capstan flanges. Figure-of-S
    shape for the band between the flanges, opposite rotational distrection,
    only one engaged pinch-wheel at a time of course. .

    By ythe way does the USA term for say the Lazy-S ranch mean an S that is
    stretched out or "laid on its back" ie turned through 90 degrees? or both ?
     
  7. N_Cook

    N_Cook Guest

    I hadn't thought of reflective-opto device - will try a diode check
     
  8. I wouldn't say it was a slight difference as in the ratio
    Well, that kind of kills my theory. Your original post indicated that this
    was a dual-capstan drive. It isn't.

    In cowboy parlance, it means "lying on its side". It does not refer to the
    shape or aspect ratio.
     
  9. N_Cook

    N_Cook Guest


    Probly diode and photo-resistor, diode on DVM and varying ohmage on another
    pair of wires, on varying the ambient light . So would only detect leader
    join, not active in the case of a tape jam
     
  10. N_Cook

    N_Cook Guest


    Which implies ranch-hands could at least recognise letters.
    Pictoral pub signs like the Red Lion or the King's Head started in Britain
    because of total illiteracy amongst a lot of the populace.
     
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