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Pioneer CD player, model no. PD-M550 spindle motor problem

Discussion in 'Electronic Repair' started by Lenny, Jun 17, 2004.

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  1. Lenny

    Lenny Guest

    This unit is a five disc changer which uses the plug in cartridge. The
    changer sequences through all the discs but the motor never starts up.
    There is no DC voltage present at the motor terminals after each disc
    seats so I don't think that its a motor problem. Does anyone have any
    information on this symptom relating to this model? Thanks very much.
    Lenny Stein, Barlen Electronics.
  2. Ampdoc

    Ampdoc Guest

    The units not achieving focus lock. The sequence of events for this and most
    other Pioneer units is as follows:

    Check for disc present- this is done by cycling the laser on in the pickup
    and sweeping the lens for a FOK signal.

    If FOK=No good then go to next tray in multi-cd, or stop and display no disc
    on single cd units.

    If FOK=Good then spindle motor activated and unit goes for tracking lock.

    If tracking and focus lock are OK, then the unit puts the servos for focus
    and tracking in closed loop mode, and normal playback begins.

    Knowing this sequence we can determine that your unit is failing to achieve
    focus on the disc. Either you have a bad pickup assembly, a bad ribbon cable
    from the pickup to the main PCB, or the decoder IC on the main pcb is
    defective. Most likely is a bad ribbon cable, as this was a very common
    failure for this unit. I do not know if the ribbon is available as a
    separate part, it's been a long time since I've worked on one of these.

    Jammy Harbin
    J & J Electronics, Inc.
    227 S. 4th St.
    Selmer, TN 38375
  3. Common with Pioneer CD changers in general if spindle motor not the
    problem: lens fallen out, bad ribbon cable, deteriorated grommets.

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  4. This model is not prone to the bad cable - it's a built-in part of the
    pickup, and doesn't get "kinked"

    I've seen lots of bad pickups on these - either the lens falls off as Sam
    mentioned, or the pickup is simply bad. I've seen them oscillate when the
    focus ramp is applied.

    Replacement is no fun. (That damned grating adjustment!)

    Mark Z.
  5. Lenny

    Lenny Guest

    So will I find the lens lying inside the unit? And can it be re attached? Lenny.
  6. So will I find the lens lying inside the unit? And can it be >re attached?

    Might be rolling around loose in there. I've seen them stuck down inside the
    disc changer mechanism, stuck in grease. Once or twice I never did find the

    It's very tricky to re-glue one of these. Don't use superglue - it will fog
    the lens permanently. Remove the plastic pickup cover and glue the lens in
    place with 3 or 4 very small spots of airplane type glue. Be very careful
    not to let any glue get between the coils and magnet posts. It'll never move
    after that!

    Mark Z.
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