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3- disc CD changer problem

Discussion in 'Electronic Repair' started by moonlite, Jul 28, 2007.

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  1. moonlite

    moonlite Guest

    Every time I load a disc, the disc won't spin until I give it a tiny
    spin by hand. When I spin the disc just a little, it will start
    playing fine without any problems. Nothing is broken (mechanically at
    least). Could this be an indication of a bad/weak laser ? If the laser
    was bad, then it won't read, period. I appreciate your opinions.

  2. N Cook

    N Cook Guest

    Does it try and start every time?
    Does it sometimes work and other times not at all until you spin it?

    The first maybe bearing problem or lack of drive, try reducing the top clamp
    force to see if that temporarily improves it.
    Second case , one armature winding inoperative due to crud on commutator or
    o/c winding

    Not a laser problem , i would say, unless it spins up and fails to read the
    TOC track.
  3. Most likely - a shorted spindle motor. You've rotated it past the shorted
    brush, so it starts to rotate. The motor is drawing too much average current
    in this condition, so you should not continue to play it this way.

    The motor brushes can often be cleaned out. One must understand how small
    motors are constructed.

    One can spray some cleaner / lubricant into the little slits at the bottom
    of the motor, aimed at the point where the brushes touch the commutator. Do
    this while rotating the motor, and it helps to use an air compressor to blow
    out excess cleaner etc from the motor. It is often necessary to repeat the
    process several times to clear the short.

    Another method is to run the motor from an external power supply at a
    higher-than-normal voltage, say 6 to 9 volts, and "burn" the short out. My
    thought is the short is more likely to recur this way.

    Mark Z.
  4. Golf

    Golf Guest

    I ditto what Mark said. A blast of contact cleaner while the motor
    rotates may resolve this problem.
  5. moonlite

    moonlite Guest

    Thank you very much gentlemen. You were a great help. I will try your

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