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DVD spindle motor replacement

Discussion in 'Electronic Repair' started by [email protected], May 6, 2005.

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  1. Guest

    I just replaced a spindle motor in a Sony DVD player. Before I removed
    the defective motor I was very careful to note the clearance between
    the bottom of the plastic piece that the disc sits on when it rotates,
    and the top of the housing that the motor is mounted to. I did this by
    using a drill bit as a feeler guage before pulling this little disc off
    the defective motor shaft when I removed it from the unit. Naturally I
    reassembled everything in the reverse order maintaining the same
    clearance with the new motor. The new motor spun up ok but would not
    read the disc until (after some tweaking with the clearance) I
    decreased it a bit more than it originally was. At that point the disc
    read fine and the job it seems was finished. A couple of things disturb
    me though. For one the final adjustment was done by pure guess work and
    although it seems to work just fine, (I have watched through a complete
    movie and listened to CD's on this unit), how do I know if the position
    of the disc relative to the laser unit is dead center or marginal? Just
    how critical is this clearance? Is there some room for a certain amount
    of error here? And also what is the correct procedure for doing this
    replacement? Thanks, Lenny Stein, Barlen Electronics.
  2. Lenny,
    I would think that although there is an exact position that it is
    designed for, the margin of error can probably be something like the
    distance the lens can move up and down to focus. For example if the
    lens can move up or down 2mm while focusing then a 1mm difference should
    not be too critical.
    But... It usually seems a little more critical than that - to keep the
    disc from scraping against the tray and allow it to eject properly, and
    to keep the disc from getting caught on the spindle when ejecting.
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