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#1
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Sony CD spindle motor ?
"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 |
#2
Posted to rec.audio.tech
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Sony CD spindle motor ?
"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. |
#3
Posted to rec.audio.tech
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Sony CD spindle motor ?
"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. |
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