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non-tracking cd player

Discussion in 'Hobby Electronics' started by [email protected], Jun 26, 2003.

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  1. Guest

    hi all,

    i've got a sherwood mini system cd/tuner/tape etc deck and the cd player
    has stopped working. it's quite old now, but a good unit, so i'd like to
    fix it.

    it starts to play a cd, and then a few seconds in it gives up and decides that
    there isnt a disc. i suspect what might be happening is that the fine tracking
    with the magnetic coils is working but the motor drive to do the coarse
    either doesnt work or is badly adjusted. i've had it running with the lid off,
    and it seems to wiggle the lens assembly, but the whole head doesnt ever move.

    the worm drive is free to move, and i greased it up a bit with some silicone
    spray, but it didnt fix it. the lens is clean and the few seconds of music that
    it does play sounds fine.

    theres a trimpot in there (maybe a tuning cap, too hard to see) that i gave the tiniest tweak and stopped it working altogether. when i tweaked it back it
    came back to it's usual half broken state.

    anyone got any clues? or know someone who'll fix it for a reasonable
    price. i like it because it integrates with the whole system, but if it costs
    more than $50ish to fix, i'll just buy a new cd player.

    thanks in advance,
    cory
     
  2. Phil Allison

    Phil Allison Guest

  3. **Yeah and that's the "Delux" model. I wonder how much the basic one is?

    Makes it pretty hard to justify repairing these things.
     
  4. **Given that service to audio equipment represents a significant proportion
    of my income, it distresses me mightily that many products are no longer
    worth servicing. However, we must be realistic about such things. People
    will always choose the least expensive option when presented with more than
    one.
     
  5. I suspect a bad laser. The good news, that it is likely to be a cheaper one
    (KSS210). Replacing this will cost more than $50, but I think it may be
    worth it.

    If in Melbourne, call me on 0414 635 468.

    Rudolf

    gave the tiniest tweak and stopped it working altogether. when i tweaked it
    back it
     
  6. -:Install:-

    -:Install:- Guest

    Put your finger on the servo drive ic..... hot ?? get this a lot with Sony
    equipment. Freeze it up and run the unit again... should run a tad longer.
    If it has discrete transistor drive do the same, check them all.
     
  7. Ken Taylor

    Ken Taylor Guest

    on. I can see a dim red light coming out of it. When I turn the unit on, the
    laser
    You aren't *looking* at the laser are you? They aren't joking with the
    warnings!

    Ken
     
  8. Guest

    no, not directly, but it's pretty easy to see that it's on.

    they're not all that dangerous, though. sure, prolonged looking is bas news,
    but the beam isn't collimated enough to be at any dangerous intensity by
    the time it gets to your eye.

    still, i'm not condoning looking right at it.

    cheers,
    cory

    btw: sign in physics lab at melb uni many years ago:

    "please do not look into the laser with your remaining eye"
     
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