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CDROM repair tip

Discussion in 'Electronic Repair' started by Sunny, Dec 13, 2004.

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  1. Sunny

    Sunny Guest

    My trusty Toshiba SCSI CDROM drive recently started spitting out any
    disc it was asked to load after 3-4 seconds.

    Took it apart and found the plastic tray drive gear had cracked - small
    one, on the motor spindle, ~5mm diameter. It's a press-fit on the
    spindle, and apparently still had enough grip to open and close the
    tray, but let go when the additional load of lifting the laser head sled
    into place was applied.

    I went looking for super glue, but it was all dried up as usual - even
    the one in the fridge. I've been known to tackle the odd plumbing job,
    so when I found a bottle of "PVC to ABS transition solvent cement", I
    couldn't resist trying it.

    I opened one end of the cracked gear about 0.5mm with a razor blade,
    poked cement into the crack with a needle, squeezed it between two
    fingers for a couple of minutes, then cleaned off excess cement with the

    The repaired gear was a tight fit on the spindle, but did not crack
    again. CDROM now works perfectly :)


    D MARSHALL Guest

    a friend of mine has got a samsung cd-rw drive
    and it opens a shuts when it wants to could
    it be the same as yours or the tray switch
    mybe faulty.

  3. I wouldn't expect it to keep working. Maybe grab a similar gear off some
    other unit.

    Mark Z.
  4. Sunny

    Sunny Guest

    In my case the tray switch wasn't activated because the laser head never
    lifted into the play position.

  5. Sunny

    Sunny Guest

    I'll post again if it breaks. I recently retrieved a couple of identical
    units from a dumpster, so there's no shortage of parts :)

  6. rb

    rb Guest

    Nice repair tip!
    I like the use of the PVC glue.
  7. Techforce

    Techforce Guest

    Sometimes just to be safe, when I do this, I power up the motor seperately
    with 9-12Vdc and while it runs, I hit the shaft a bit with some metal
    sandpaper -
    just to knock off a little bit of the interference fit on the plastic. I
    find it usually lessens the chance of the same pressure being applied again,
    which was most likely the cause of the original crack. It also lessens the
    chance a bit of seeing the repair open up again. Its good also if you can
    place the pulley in a C-clamp or a pana-vise
    after you apply the mending compound.

    | The repaired gear was a tight fit on the spindle, but did not crack
    | again. CDROM now works perfectly :)
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