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CDROM Drive Problem

Discussion in 'Electronic Repair' started by Jeff Bonggren, Mar 30, 2005.

  1. I'm trying to repair an old 3DO game unit (Panasonic FZ-1) that
    failed several years ago due to a problem in the CDROM drive
    (Matsushita-Kotobuki CR-560-B). It had gone unused for several years
    before that. Before it failed, the seek sound seemed to be louder than
    normal. (Though perhaps I just forgot how loud it was before!)

    As it is now, the drawer responds to the open/close button but the CD
    just sits there and never spins-up.

    I've disassembled the unit and removed the controller board from the CDROM
    drive. I've tested each of the motors by applying power to them
    individually. Only the sled motor and its mechanisms seem irregular. They
    seem to make a grinding sound but otherwise seem to work fine. The sled
    motor itself is somewhat noisy and shaky when run alone outside the unit.

    I've tested each of the contact switches and they all seem to be working.

    When I power up the unit with the cover off, I can see that the sled never
    moves, the laser never shines, and the lens never tries to focus.

    After disassembling and reassembling several times, the CDROM drive
    suddenly started working again. On power-up or drawer-close, the sled
    moved to the start position, the laser turned on, and the lens started
    focusing. When I put an audio CD in, it spun up and played. I thought I
    was home free. Unfortunately, when I fully assembled the unit it went back
    to its previous behavior!

    I've been able to get it working a few more times, though it would
    stop working again as soon as I opened and closed the drawer.

    I'm really at a loss as to what is going on here. I can't seem to get it
    to correlate with any particular component. I've read the FAQ quite a few
    times and my particular situation doesn't seem to be covered. I know the
    pickup works, the motors work, the switches work, and the controller board
    works (though any of these could perhaps have an intermittent problem).

    Anyone have any ideas?

    Anyone know where I could find a replacement reader if I can't get this
    fixed? The drive seems to have a nonstandard data/power interface so I
    can't just plop any old IDE CDROM drive in there.

    Thanks,
    Jeff
     
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