CD player not working fine, help needed

Assyst1606 · 18th August 2008, 04:31 AM

Hi all,
Help needed. I took out my old Sony CD player & spin some CDs, it can played fine but after a while, it displayed “No disc”. I removed the cover but couldn’t find anything abnormal.
The next day, the same thing happened. I noticed the first few times, the disc is spinning fast therefore no problem playing it. But when the problem (no disc) happened, the CD spin just a few rounds (very weak).
I don’t think it’s the motor nor the lens because it can play the first few times.
Any idea or feedback?
Thanks!

Mooly · 18th August 2008, 06:39 AM

Model number ? What type of pickup is it, eg KSSxxx . Have you actually tried cleaning the lens properly.

Assyst1606 · 18th August 2008, 06:51 AM

Hi,
It's Sony CDP-590, 1990 model. I'm not sure about the lens assy. I sure did clean the lens. It can play for the first 1-2 CDs, I think could it be some components got heat up after a short while.

Mooly · 18th August 2008, 07:04 AM

Without test equipment it's hard to say. To be honest, most faults are down to the very two items you mention. You need to connect a 'scope to the RF signal (eye pattern) to determine both it's amplitude and general quality.
Have worked on 1000's of audio units, and pickup and spindle motor problems top the list. Its worth disconnecting the spindle motor and applying a 9 volt battery for 5 secs or so each way round to help clean up the commutator ( assuming it's a DC motor. )
I would go for the pickup -- the type number is on the side.

xaudiox · 18th August 2008, 07:12 AM

KSS-210A is the pickup assembly of CDP-590..

http://www.vasiltech.nm.ru/files/cd-...ransport.htm#S

Assyst1606 · 18th August 2008, 02:35 PM

Hi,
Thanks for the advice.
Is it easy to replace the pickup lens?
I’m not sure about the price yet but I’m wondering if it’s worth to replace it.

xaudiox · 18th August 2008, 02:43 PM

you can buy the lens in ebay for less than 10$.. yeah its easy to replace the lens, its worth the effort..

Mooly · 18th August 2008, 04:06 PM

As easy as it looks

No just joking, really it's easy. Just make sure you get the correct suffix a,b etc and remember once it's in and not before, to unsolder the little "shorting" blob of solder on it.

Assyst1606 · 19th August 2008, 04:07 AM

Hi,
OK, I managed to find out from my brother, he did dismantle the whole transport assy before. When he re-installed back, somehow it wasn’t done right.
Last night upon checking, found the CD was wobbling (quite bad) during the initial spin. I removed the 3 screws that secured the whole assy & tried to re-install it properly, that is minimize the tilting. Load the CD & it works for now.
I still see some wobbling (maybe it’s normal) when the CD spins but I guess that’s not much I can improve on it. Am I right?
Moving forward I would like to upsize the 2 big capacitors (from 4700uF 16V to 10000uF 16V), the ones right after the bridge diode. And also replace the original small bridge diodes to those big Soft recovery ultra fast type (SBYV28-200).
Based on these upgrade, will I cause any damage down the circuit chain?
Any feedback is greatly appreciated.
Thanks!

Mooly · 19th August 2008, 06:21 AM

The CD should not "wobble" at all. If it doesn't run true this is either dirt on the platter or damage of some sort. Or possibly the magnetic clamp not seating correctly. If this isn't right you are wasting your time trying anything else. Spin the CD slowly by hand and look at the edge. Anything much more than the thickness of a piece of paper "wobble" at the outer edge and it's not good enough.
The PSU mods won't cause any problem.

18th August 2008, 04:31 AM	#1
Assyst1606 diyAudio Member Join Date: Sep 2006	CD player not working fine, help needed Hi all, Help needed. I took out my old Sony CD player & spin some CDs, it can played fine but after a while, it displayed “No disc”. I removed the cover but couldn’t find anything abnormal. The next day, the same thing happened. I noticed the first few times, the disc is spinning fast therefore no problem playing it. But when the problem (no disc) happened, the CD spin just a few rounds (very weak). I don’t think it’s the motor nor the lens because it can play the first few times. Any idea or feedback? Thanks!

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18th August 2008, 06:39 AM	#2
Mooly diyAudio Moderator Join Date: Sep 2007	Model number ? What type of pickup is it, eg KSSxxx . Have you actually tried cleaning the lens properly.

18th August 2008, 06:51 AM	#3
Assyst1606 diyAudio Member Join Date: Sep 2006	Hi, It's Sony CDP-590, 1990 model. I'm not sure about the lens assy. I sure did clean the lens. It can play for the first 1-2 CDs, I think could it be some components got heat up after a short while.

18th August 2008, 07:04 AM	#4
Mooly diyAudio Moderator Join Date: Sep 2007	Without test equipment it's hard to say. To be honest, most faults are down to the very two items you mention. You need to connect a 'scope to the RF signal (eye pattern) to determine both it's amplitude and general quality. Have worked on 1000's of audio units, and pickup and spindle motor problems top the list. Its worth disconnecting the spindle motor and applying a 9 volt battery for 5 secs or so each way round to help clean up the commutator ( assuming it's a DC motor. ) I would go for the pickup -- the type number is on the side.

18th August 2008, 07:12 AM	#5
xaudiox diyAudio Member Join Date: Jul 2006	KSS-210A is the pickup assembly of CDP-590.. http://www.vasiltech.nm.ru/files/cd-...ransport.htm#S

18th August 2008, 02:35 PM	#6
Assyst1606 diyAudio Member Join Date: Sep 2006	Hi, Thanks for the advice. Is it easy to replace the pickup lens? I’m not sure about the price yet but I’m wondering if it’s worth to replace it.

18th August 2008, 02:43 PM	#7
xaudiox diyAudio Member Join Date: Jul 2006	you can buy the lens in ebay for less than 10$.. yeah its easy to replace the lens, its worth the effort..

18th August 2008, 04:06 PM	#8
Mooly diyAudio Moderator Join Date: Sep 2007	As easy as it looks No just joking, really it's easy. Just make sure you get the correct suffix a,b etc and remember once it's in and not before, to unsolder the little "shorting" blob of solder on it.

19th August 2008, 04:07 AM	#9
Assyst1606 diyAudio Member Join Date: Sep 2006	Hi, OK, I managed to find out from my brother, he did dismantle the whole transport assy before. When he re-installed back, somehow it wasn’t done right. Last night upon checking, found the CD was wobbling (quite bad) during the initial spin. I removed the 3 screws that secured the whole assy & tried to re-install it properly, that is minimize the tilting. Load the CD & it works for now. I still see some wobbling (maybe it’s normal) when the CD spins but I guess that’s not much I can improve on it. Am I right? Moving forward I would like to upsize the 2 big capacitors (from 4700uF 16V to 10000uF 16V), the ones right after the bridge diode. And also replace the original small bridge diodes to those big Soft recovery ultra fast type (SBYV28-200). Based on these upgrade, will I cause any damage down the circuit chain? Any feedback is greatly appreciated. Thanks!

19th August 2008, 06:21 AM	#10
Mooly diyAudio Moderator Join Date: Sep 2007	The CD should not "wobble" at all. If it doesn't run true this is either dirt on the platter or damage of some sort. Or possibly the magnetic clamp not seating correctly. If this isn't right you are wasting your time trying anything else. Spin the CD slowly by hand and look at the edge. Anything much more than the thickness of a piece of paper "wobble" at the outer edge and it's not good enough. The PSU mods won't cause any problem.