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Yamaha cd player spindle problem??

Discussion in 'Electronic Repair' started by TJB, Mar 6, 2007.

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  1. TJB

    TJB Guest

    Need some help please, please, on a Yamaha CD Player model cdc-60.

    Just replaced the laser unit and it detects the CD and the spindle motor
    starts up ok. Hit the play button and the unit plays okay for about 15
    minutes then starts to slow down, speed generally wanders around and
    eventually stops and indicates there is no CD present.

    Is this likely to be a motor problem? If not any hints? This unit is not
    the best to try and work on as you can't get to anything while the it is
    playing

    Thanks for any help
    TJB
     
  2. N Cook

    N Cook Guest

    Try electrically disconnecting the motor (cut trace maybe) and running it,
    the motor in isolation, from a bench power supply to see if its a bearing
    problem.
    Only low voltage, 1 to 2volts at most usually
     
  3. TJB

    TJB Guest

    I did try running the motor from a low voltage and it ran okay but maybe
    I should let it run for 30min or so and see what happens???

    TJB
     
  4. They had problems with shorted brushes on those motors...

    Mark Z.
     
  5. TJB

    TJB Guest

    Is the problem I described above a symptom of shorted brushes. I
    originally though it may be an overheating problem. Are there any other
    faults which could manifest themselves as described?

    Is it possible to clean/repair these motors or do you simply just go and
    buy another one?

    Thanks for the help so far
    TJB
     
  6. N Cook

    N Cook Guest

    The problem is removing the interference fit platter from the spindle
    without deforming the platter or if replacing the motor messing up the
    internal contact fingers by indirectly pulling at the spindle as well as
    original problem.
     
  7. The motor can be checked with an ohmmeter at a low ohms range setting, while
    SLOWLY rotating the motor. It should normally read 10 to 12 ohms or so. The
    reading will vary while turning, but should not be short-circuit or open at
    any one spot in it's rotation.

    It is often possible to clear the short using an aerosol cleaner / lubricant
    with a pinpoint applicator, sprayed through the slits at the bottom, aimed
    at the brushes, while rotating manually, alternating with blowing it out
    with a compressor. It's usually necessary to repeat several times before the
    short clears. Blow out the excess cleaner with the compressor. You really
    need to understand the construction of small motors so you can "aim" the
    cleaner at the brushes.

    Mark Z.
     
  8. See: http://www.repairfaq.org/sam/cdfaq.htm#cdmot

    --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: Anything sent to the email address in the message header above is
    ignored unless my full name AND either lasers or electronics is included in the
    subject line. Or, you can contact me via the Feedback Form in the FAQs.
     
  9. TJB

    TJB Guest

    Thanks, I will try the motor rotation test and see what happens.
    Any thing else worth checking??

    Thanks
    TJB
     
  10. TJB

    TJB Guest

    Great repair faq!

    Thanks
    TJB
     
  11. TJB

    TJB Guest

    I measured the spindle motor resistance, it varied between 3 and 5 ohms.
    Normal??? Doesn't seem to have any slop in the bearing, but I put a
    very small drop of machine oil on it anyway.

    I also noticed another possible problem with this deck: the clearance
    from the bottom of a cd in the holder to a plastic locating pin which
    pushes through a slot in the turntable is very very small. Possibly the
    spindle platter height is to low? There is a remote chance of a cd
    rubbing on this pin as it is playing.

    Anyone have a value from the correct platter height? I measured from the
    chassis to the very start of the black plastic platter at 8.3mm, oops I
    probably should have measured to the flange where a cd would sit.

    Anyway can anyone let me know what the platter height measurement should
    be : I guess that would be from where a cd sits to the chassis??

    Thanks
    TJB
     
  12. I'm almost certain the 3 to 5 ohms is too low. Spindle height is not
    standarized from model to model, but I believe it needs to be about 2 to 3
    mm clearance from the pickup lens to the underside of the disc.

    Mark Z.
     
  13. Ken G.

    Ken G. Guest

    That motor is supposed to slow down as the disk gets further done . All
    cd players do that .
    It takes a pretty free spining motor to run right at such low speeds .
    Put a drop of oil at the top bushing .
    I have had some luck running the motor isolated like already mentioned
    but using 6 or 9 volts to blow the carbon out of it so to speak ... that
    may or may not last . New motors are cheap
     
  14. I agree that 3 to 5 ohms sounds low. Try this quick test: Disconnect
    the motor from the CD player and run it for a few seconds *only* at
    8 or 10 V. This may blow out some of the crud but shouldn't damage
    an otherwise healthy motor. Then retest and report back. :)

    --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: Anything sent to the email address in the message header above is
    ignored unless my full name AND either lasers or electronics is included in the
    subject line. Or, you can contact me via the Feedback Form in the FAQs.
     
  15. TJB

    TJB Guest

    (Ken G.) wrote in 3237.bay.webtv.net:
    Unfortunately the motor was slowing down too much and the audio was
    breaking up horribly and then the motor would eventually stop.

    I will probably replace the motor

    Thanks
    TJB
     
  16. TJB

    TJB Guest


    Pickup lense seems to be around 2mm, its that damn turntable locating
    pin (don't know why is has to be sooo big) that seems to close for
    comfort.

    Tried it for a few secs at a higher voltage; the motor still measures
    around 3-5 ohms turning it slowly by hand. maybe I should just change
    it. Seems simple enough the platter is just a tight fit and should just
    pull straight off.

    Thanks

    TJB
     
  17. TJB

    TJB Guest

    Looking at a replacement motor. The original is RF-310T-11400. The only
    motor I have found readily available is an RF-310. Is there any
    difference between the RF310 and the RF310T ??

    Also avalable is a MDN4RA, looks like that is also the same physical
    size. Not sure if its suitable as there doesn't seem to be much info on
    any of these motors.

    Thanks
    TJB
     
  18. Try to get the exact same motor number. The different model suffixes often
    relate to the length of the motor spindle (shaft).

    Carefully measure the spindle platter height before you remove it. Also, be
    aware that you won't likely be able to get it installed on the new motor
    "quite" true, meaning that you will probably have some spindle motor wobble
    after the new motor is installed. Shouldn't really be a problem, but I
    thought it should be mentioned...


    Mark Z.
     
  19. Ron(UK)

    Ron(UK) Guest

    Pioneer cd assemblies have a little 'break off' U shaped turntable
    height gauge moulded onto the plastic frame, maybe yours has something
    similar

    Ron(UK)
     
  20. TJB

    TJB Guest

    Mark, this may be a dumb question but I am going to ask anyway. Why
    would putting the platter onto a new motor cause any more wobble than
    with the current motor??? It has one of those pressed on plastic
    platters and assuming I don't bend the spindle.


    TJB
     
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