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Question - CD changer alignment

Discussion in 'Electronic Repair' started by Fred, Jan 4, 2006.

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  1. Fred

    Fred Guest

    Is it difficult to align a cd changer? I have an older Denon DCM 440 cd
    changer (5 disc tray) that needs alignment. If I can I like to try and fix
    things myself and if I screw up it is no big loss in this case.
    Thanks for any help.
  2. What makes you think it needs alignment?

    Mark Z.
  3. Fred

    Fred Guest

    When playing a cd, it "skips" forward through the cd and the lens has been
    cleaned with no effect. It only plays a few seconds of each song here and
    there. I was told at a repair shop that it likely needs to be aligned. If
    it was a simple enough repair I figured I would try it.
  4. If it needed alignment, why didn't the shop do it?

  5. Arfa Daily

    Arfa Daily Guest

    If the unit has setup pots, you could try turning up the one called Tracking
    Gain a little, which may help, but the kind of problem you are describing,
    if not attributable to the mechanics of sled drive, is usually due to a worn
    laser. I can't remember which laser this model has in it, but many Denons
    use standard Sony types, most of which are readily available and cheap. If
    it is a Sony type, it will have a little label on the connector pcb at the
    back of the laser, which will have the type printed on it. It will start "
    KSS " then some figures such as 210A or 210B or 212 or 213 etc. The letter
    which follows the numbers is important.

    And other reply-ers. Please don't top post. It makes threads difficult to
    follow ...

  6. Lots of problems like this are fixed with routine maintenance, such as
    cleaning - lubricating sled rails, gears, sliders, the spindle motor shaft,

    Mark Z.

  7. P.S.

    I just got through with a similar reply and decided I should have elaborated
    on this one a bit better. Here's the reply to the other guy - mostly it
    would apply here as well.

    "Cleaning discs are a waste of time and money. A proper cleaning and routine
    maintenance will very often fix problems like this.

    The lens cleaning is easy - one just takes 2 cotton swabs, fluff up the ends
    a bit. Have one moistened but not dripping with window cleaner or isopropyl
    alcohol. GENTLY clean the lens with the damp one using a rolling motion,
    follow with the other to catch any residue.

    A small drop of light oil at the spindle motor shaft (use the dry end of a
    swab to remove any excess) is a good idea.

    Other gears and sliding surfaces can be cleaned and re-greased.

    Your player could have other problems - a bad or marginal motor for example,
    but many pickups are replaced unnecessarily, and circuit adjustments will
    usually only partially compensate for what is really wrong. For example,
    adjusting the tracking gain might somewhat compensate for a lubrication
    problem involving the sled assembly. For this reason, adjustments should
    usually only be attempted by a technician with a service manual in hand, or
    at least with a knowledgeable technique."

    Mark Z.
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