Re: Sony CD spindle motor ?

[Trevor Wilson]

"Soundhaspriority" > wrote in message
...
>
> "Mark Zacharias" > wrote in message
> ...
>> "Soundhaspriority" > wrote in message
>> ...
>>>
>>> "isw" > wrote in message
>>> ]...
>>>> In article >,
>>>> "Soundhaspriority" > wrote:
>>>>
>>>>> I've got a 202ES player where the motor does not reliably start. If it
>>>>> starts, it runs at the correct speed. Usage was very light.
>>>>>
>>>>> Is there any active circuitry inside the motor, or just a Hall effect
>>>>> sensor?
>>>>>
>>>>> How many poles does it have?
>>>>
>>>> Just about every CD spindle motor I've ever seen has been a "universal"
>>>> type with brushes.
>>>>
>>>> My guess is that there's some dirt or corrosion in or around the
>>>> commutator. Take it apart (carefully, or you'll ruin the brushes), and
>>>> give things a good polish. Be sure to look for faulty solder joints on
>>>> the armature, too.
>>>>
>>>> Isaac
>>>
>>> Hi, Isaac. Thanks for your response. I'm shocked it has a commutator.
>>> How is constant speed maintained?
>>>
>>> Bob Morein
>>> (310) 237-6511
>>>
>>
>>
>>
>> Timing data is recovered from the cd itself and frame sync is maintained
>> by the decoder IC and motor drive circuit.
>>
>> Mark Z.
> Thanks, Mark. Since the motor is apparently a brush, DC servo design, it
> does seem likely that the fault is in the motor itself.
>
> How does the CD spindle attach to the motor shaft? Has anybody removed and
> replaced one? Press fit, interference fit, bonded?

**Cyanoacrylate.


--
Trevor Wilson
www.rageaudio.com.au

[Mark Zacharias]

"Trevor Wilson" > wrote in message
...
>
> "Soundhaspriority" > wrote in message
> ...
>>
>> "Mark Zacharias" > wrote in message
>> ...
>>> "Soundhaspriority" > wrote in message
>>> ...
>>>>
>>>> "isw" > wrote in message
>>>> ]...
>>>>> In article >,
>>>>> "Soundhaspriority" > wrote:
>>>>>
>>>>>> I've got a 202ES player where the motor does not reliably start. If
>>>>>> it
>>>>>> starts, it runs at the correct speed. Usage was very light.
>>>>>>
>>>>>> Is there any active circuitry inside the motor, or just a Hall effect
>>>>>> sensor?
>>>>>>
>>>>>> How many poles does it have?
>>>>>
>>>>> Just about every CD spindle motor I've ever seen has been a
>>>>> "universal"
>>>>> type with brushes.
>>>>>
>>>>> My guess is that there's some dirt or corrosion in or around the
>>>>> commutator. Take it apart (carefully, or you'll ruin the brushes), and
>>>>> give things a good polish. Be sure to look for faulty solder joints on
>>>>> the armature, too.
>>>>>
>>>>> Isaac
>>>>
>>>> Hi, Isaac. Thanks for your response. I'm shocked it has a commutator.
>>>> How is constant speed maintained?
>>>>
>>>> Bob Morein
>>>> (310) 237-6511
>>>>
>>>
>>>
>>>
>>> Timing data is recovered from the cd itself and frame sync is maintained
>>> by the decoder IC and motor drive circuit.
>>>
>>> Mark Z.
>> Thanks, Mark. Since the motor is apparently a brush, DC servo design, it
>> does seem likely that the fault is in the motor itself.
>>
>> How does the CD spindle attach to the motor shaft? Has anybody removed
>> and replaced one? Press fit, interference fit, bonded?
>
> **Cyanoacrylate.
>
>
> --
> Trevor Wilson
> www.rageaudio.com.au
>
>
>
>


Better get it right the first time, and don't let any run down into the top
bearing of the motor.

They are in fact press-fit at the factory, with the exception of a few that
use set-screws. These will be metal of course, not plastic.

Mark Z.

[Mark Zacharias]

"Soundhaspriority" > wrote in message
...
>
> "Mark Zacharias" > wrote in message
> ...
>> "Trevor Wilson" > wrote in message
>> ...
>>>
>>> "Soundhaspriority" > wrote in message
>>> ...
>>>>
>>>> "Mark Zacharias" > wrote in message
>>>> ...
>>>>> "Soundhaspriority" > wrote in message
>>>>> ...
>>>>>>
>>>>>> "isw" > wrote in message
>>>>>> ]...
>>>>>>> In article >,
>>>>>>> "Soundhaspriority" > wrote:
>>>>>>>
>>>>>>>> I've got a 202ES player where the motor does not reliably start. If
>>>>>>>> it
>>>>>>>> starts, it runs at the correct speed. Usage was very light.
>>>>>>>>
>>>>>>>> Is there any active circuitry inside the motor, or just a Hall
>>>>>>>> effect
>>>>>>>> sensor?
>>>>>>>>
>>>>>>>> How many poles does it have?
>>>>>>>
>>>>>>> Just about every CD spindle motor I've ever seen has been a
>>>>>>> "universal"
>>>>>>> type with brushes.
>>>>>>>
>>>>>>> My guess is that there's some dirt or corrosion in or around the
>>>>>>> commutator. Take it apart (carefully, or you'll ruin the brushes),
>>>>>>> and
>>>>>>> give things a good polish. Be sure to look for faulty solder joints
>>>>>>> on
>>>>>>> the armature, too.
>>>>>>>
>>>>>>> Isaac
>>>>>>
>>>>>> Hi, Isaac. Thanks for your response. I'm shocked it has a commutator.
>>>>>> How is constant speed maintained?
>>>>>>
>>>>>> Bob Morein
>>>>>> (310) 237-6511
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Timing data is recovered from the cd itself and frame sync is
>>>>> maintained by the decoder IC and motor drive circuit.
>>>>>
>>>>> Mark Z.
>>>> Thanks, Mark. Since the motor is apparently a brush, DC servo design,
>>>> it does seem likely that the fault is in the motor itself.
>>>>
>>>> How does the CD spindle attach to the motor shaft? Has anybody removed
>>>> and replaced one? Press fit, interference fit, bonded?
>>>
>>> **Cyanoacrylate.
>>>
>>>
>>> --
>>> Trevor Wilson
>>> www.rageaudio.com.au
>>>
>>>
>>>
>>>
>>
>>
>> Better get it right the first time, and don't let any run down into the
>> top bearing of the motor.
>>
>> They are in fact press-fit at the factory, with the exception of a few
>> that use set-screws. These will be metal of course, not plastic.
>>
>> Mark Z.
>
>>
> Interesting. Answer took a long time coming, but interesting :)
>
> Bob Morein
> (310) 237-6511
>


Not quite sure what you meant by "long time coming". I responded in a timely
fashion to Trevor's , " **Cyanoacrylate. "

Suggestion.

Mark Z.