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BOSE Lifestyle 12 Repair - Receiver CD Player

Discussion in 'Electronic Repair' started by Mike, May 11, 2004.

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  1. Mike

    Mike Guest

    Please can anyone give me any advice with my BOSE LifeStyle 12 CD
    Player? The motor which is used to position the lens keeps turning
    even once the lens hits its stop position, so it doesn't recognise
    disks and makes a loud "clacking" sound as the gears jump.

    I think there's a problem detecting that the lens has reached its stop
    position. When the lens reaches the correct position, it closes a
    Microswitch, and the switch is working. The connections between that
    switch and the main board are also intact, but I'm not really sure
    where to go next.

    Is this a common problem? Has anyone fixed this problem before? Can
    anyone point in the right direction of the components involved in that
    part of the circuit? Does anyone have a schematic that would make
    things easier?

    Any help would be greatly appreciated!


    -- Mike --
  2. Possibly a bad drive IC, a bad reference at the input to the drive IC, such
    as a problem with a voltage divider, a power supply problem, a system
    control problem, let's see. Have I missed anything?
    Bose' factory service is really pretty reasonable. They can quote you a
    price over the phone. Maybe better to send this one to them and let them
    have the headache.

    Mark Z.
  3. Mike

    Mike Guest

    There's more...

    After some more digging around, there's a diode on the board that
    doesn't seem to be working anymore. At some point it seems to have
    gotten very hot, as there's marking on the board.

    The diode is labelled D505, and is in series with a 56ohm resistor.
    But, the diode has no distinguishing markings.

    Please could anyone tell me what kind of diode this is so that I could
    replace it? Also, the resistor and diode just seem to be in series
    between the power rails, and I can't find any connection do the point
    between them. Please could someone tell me what the purpose of this
    part of the cicuit is? Have I missed something obvious?

    Any help greatly appreciated once again!


    -- Mike --
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