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Portable CD player problem

Discussion in 'Electronic Repair' started by M Jones, Dec 14, 2004.

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  1. M Jones

    M Jones Guest

    Hi all,

    I have a problem with my Sharp portable CD player / radio. All my CD's are
    skipping. I've cleaned the lens but I think it's probably a motor /
    mechanical problem. When I play a disc a track will play for a few moments
    and then the disc will stop spinning and come back to life again.

    I think its probably had it. I was just wondering if anybody knows what the
    life of a portable CD player actually is? I listen to CD's on this player
    when i'm working in the office. I've played it constantly every other week
    for over 2 years. I reckon its played over 2000 hours of music.

    Is it worth buying a lens cleaner or is it most likely mechanical?
     
  2. Jerry G.

    Jerry G. Guest

    The laser in the pickup head is probably weak from use. This is common. It
    is time to get a new CD player. Servicing would be too expensive.

    --

    Jerry G.
    ======


    in message Hi all,

    I have a problem with my Sharp portable CD player / radio. All my CD's are
    skipping. I've cleaned the lens but I think it's probably a motor /
    mechanical problem. When I play a disc a track will play for a few moments
    and then the disc will stop spinning and come back to life again.

    I think its probably had it. I was just wondering if anybody knows what the
    life of a portable CD player actually is? I listen to CD's on this player
    when i'm working in the office. I've played it constantly every other week
    for over 2 years. I reckon its played over 2000 hours of music.

    Is it worth buying a lens cleaner or is it most likely mechanical?
     
  3. Hi,

    The laser output power may fade - 2000 hours should be no problem.
    What I would expect is that the spinning up from 1x to overspeed
    may have some side effects.
    Does this effect occur with shock protection on / off - maybe it still works
    without shockprotection (= 1x speed - no spinup).
    The spinup problem might come from worse readability / to less laserpower -
    or too much powerconsumption from the turntable motor - worn bearing -
    defect motor brushes. The increased powerconsumption can influence the
    output
    stages of the actuators ...
    1) Is the effect different with esp on/off ?
    2) The only thing additional to cleaning is to change the output power
    calibration
    of the pickup. A potentiometer at the pickup calibrates the feedback signal
    from
    the monitor diode. This potentiometer is normally from laserdiode to
    ground - weakening
    the feedback signal. By slightly reducing its resistance - the aging / power
    fade can be
    compensated. - for some time - if its a marginal effect - a subtle
    change would help a
    lot.
    Before manipulation - I would do check if problems appear with all types of
    disc CD,CDR,CDRW - problems with CDRW are a good indication for faded
    laser.

    Wolfgang
     
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