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problems with my Adcom CD player

Discussion in 'Electronic Repair' started by Shaun, Feb 20, 2011.

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  1. Shaun

    Shaun Guest

    Hello,

    I have a used ADCOM GCD-700 5 disk CD player that was given to me and it is
    overly sensitive to vibrations, bumps and slight scratches on the CDs. I've
    mounted it on vibration absorbing rubber and this has greatly impoved its
    bump and vibration sensitivity, but it is still very sensitive to the
    slightest mark or scratch on cds. How can I cure this.

    thanks in advance,

    Shaun
     
  2. Tim Schwartz

    Tim Schwartz Guest

    Shaun,

    If this machine is as old as I think it is, then its not worth putting
    any serious money into it. There is likely a manufacturing date on the
    machine that will give the month and year it was made. Make sure if
    there are any transit screws on the bottom they are removed or in the
    released position.

    You could try cleaning the lens and the disc platter. You'd have to
    open the machine to do this. the lens is about the size of a pencil
    eraser, and is on a suspension, so be gentle with it. I use a cotton
    swab moistened with lens cleaning fluid, though Windex will probably do.
    I also clean off the platter that the disc sits on while spinning.
    I've seen enough debris build up on the platter over time that it no
    longer lets the disc sit flat, and that can cause all kinds of grief.
    Again, a moistened swab or slightly damp cloth is all you need to clean it.

    Beyond that, you are likely to have a worn out laser, which is likely
    to be more expensive to replace than the machine is worth.

    Regards,
    Tim Schwartz
    Bristol Electronics
     
  3. Shaun

    Shaun Guest

    This CD player is a higher quality model and one of the only multidisk units
    that uses high quality components. Mechanically it's not made very well
    though, but the electronic audio stages are all class A, so it's worth my
    time and some money to try to fix it.

    Thanks for your reply.

    Shaun
     
  4. Shaun

    Shaun Guest

    Thanks for the links, I'll probably order a new laser head for it, but first
    I'll lake it apart and clean the lenses.

    Shaun
     
  5. Absolutely clean it. Should help.

    Mark Z.
     
  6. N_Cook

    N_Cook Guest

    Then after cleaning and before ditching. Find the "power pot" ,measure
    resistance with a DVM , "both ways" in case of a difference, so you can get
    back to that value. Change the value , no more than 5 percent, to see if it
    improves error proneness
     
  7. N_Cook

    N_Cook Guest


    Which implies 3 analoguey things that could drift over time. I would take 3x
    0.1 percent measurements and tabulate some twiddlings v drop-out time of a
    known bad ie deliberately scratched track on a CD. As last legs anyway,
    nothing to loose except a bit of time
     
  8. Shaun

    Shaun Guest

    I'm sure I can find a few CDs that are scratched in my collection.

    shaun
     
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