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Sansui record player anti-skate problem

Discussion in 'Electronic Repair' started by louis, May 24, 2004.

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  1. louis

    louis Guest

    Hi,

    I have a Sansui record player (P-900 model). Some kid grabbed the
    tone-arm at a Girl-Guide meeting and now the tone-arm flys across a
    record and wont play.

    I don't see any adjustments. I took the bottom cover off and looked
    inside. I don't see any anti-skating mechanism at all.

    There is a brass pin that comes down from through the pivot shaft -
    could that have had a spring?

    Thanks,
     
  2. John Miller

    John Miller Guest

    Simplest things that could cause the symptom first: check to see if the
    stylus is still there, and if so, if it can still contact the record
    surface, and is straight.
     
  3. I have a Sansui record player (P-900 model). Some kid grabbed the
    If the turntable has it, try checking the tracking force adjustment and
    recalibrating it if necessary. - Reinhart
     
  4. louis

    louis Guest

    Thanks for the reply.

    The stylus is still there and it is straight in the cartridge. When I
    weigh down the tone arm it will track a bit better. If I tilt the
    whole unit it tracks better still.
     
  5. louis

    louis Guest

    Thanks for the reply.

    The turntable has no tracking force adjustment.

    I guess no adjustments were planned for this unit as the cartridge
    mount is specific with pins that plug into the tone arm and held with
    a screw.
     
  6. The needle can still be there but missing the diamond. Clean the stylus and
    look closely. If it looks like a post or stud, the diamond is gone. Quite
    common when they are mishandled.

    Mark Z.
     
  7. louis

    louis Guest

    The diamond is still there. The turntable will track without skipping
    to much if I weigh down the tone arm and put the unit on an angle. The
    sound quality is OK.
     
  8. Thanks for the reply.
    This is a tangential tracking turntable? - Reinhart
     
  9. On many basic tonearms, there is a spring that runs down the bottom of
    it. One end often hooks just behind the cartridge, and the other near the
    pivot. HIGHER spring pressure REDUCES tracking force because it sort-of
    pulls up. If that spring got caught and tightened, it could be pulling the
    arm up and reducing tracking force too much. It's also possible it works
    the other way, and the missing spring is removing your downforce.

    If I remember right, ceramic cartridges typically like 5-6grams, and
    magnetic cartridges around 2-3.
     
  10. louis

    louis Guest

    No, this is a mid-80's belt drive turntable with knob to adjust
    platter speed using a strobe system.
     
  11. louis

    louis Guest

    This is a mid-80s turntable. I recall the old Garrard record players
    that with the springs inside the tone arms.
     
  12. ED

    ED Guest

    There should be some mechanism to adjust the balance of weight on the
    arm to allow for the weight of different catridges

    I would look closely at the area behind the piviot to see it there is
    a counter weight that can be moved back and forth to adjust the
    tracking force.

    Good Luck.
     
  13. louis

    louis Guest

    Your suggestion makes a lot of sense but the counter weight is a peice
    of lead screw into the plastic shell behind the pivot. There is not
    adjustment.

    I would have to carve away some lead to move the weight towards the
    pivot, but that removes material!
     
  14. Ken Weitzel

    Ken Weitzel Guest

    That can't be it. Couple of questions. Is it possible
    that when she grabbed it that the whole arm moved in
    respect to its holder? Hmmmm. Picture a T shape, where
    the vertical bar is the support for the arm. The top piece
    of that T is the arm; one end holding the cartridge, the
    other holding the counterbalance. Now imagine the effect
    of moving the top piece back along the vertical piece.

    Yikes, hard to explain. Old, stroke damaged guy. Think
    about it and see if it makes any sense to you :)

    Another thought. Is it possible that she caused the
    cartridge to bounce, and knocked the diamond off?

    Take care.

    Ken
     
  15. ED

    ED Guest

    To take a good look at this and to make sure you aren't looking at the
    wrong thing, I would attempt to measure the weight on the needle.
    Something between 1.5 to 5 grams seems to be the norm.

    If you have something in this range there is something else that is
    misaligned or broken.

    You have stated that the diamond on the needle is still intact. The
    point could be misaligned to it does not engage the record groove.
     
  16. Asimov

    Asimov Guest

    "louis" bravely wrote to "All" (26 May 04 01:12:25)
    --- on the heady topic of "Re: Sansui record player anti-skate problem"

    Antiskating is often as simple as a string tied to a weight pulling at
    a lever off the tonearm rotation axis. A spring doesn't work as well
    because the strength varies with the rotation but is still used
    nonetheless. These adjustments were external in early audiophile
    turntables but were hidden from the average consumer in later models.
    You will have to lift the turntable off the mounting to gain access
    beneath the tonearm, unless the tonearm unmounts easily from the top.
    Examine for damage to the antiskate mechanism whichever was used.

    A*s*i*m*o*v

    .... That was a fascinating period of time for electronics
     
  17. louis

    louis Guest

    I have had the tone arm off the pivot and opened up the bottom. There
    is not anti-skate device visible. There is a brass pin coming down the
    pivit shaft but if a spring was attached to it - it is gone now.
     
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