Question about Philips Audio Players & Recorders
If your CD player has been working for many hours and cleaning the lens didn't help, then the next thing to do is changing the spindle motor (the one that spins the disc), since the brushes and the commutator get dirty/oxydized with many hours of performance.
The motor can also be cleaned, but it's kinda complicated and delicate to do it, so you might want to change it instead.
The same holds for the slide motor (the motor that changes the position of the laser pickup).
To clean the motor you need to desolder/remove it and open it up (you need to bend out the clamped parts on the motor housing to release the cover - also, mark the position of the cover so you can put it back in place in the same position as it was prior to opening it - some motors have an indentation so that the cover fits in place in only one position).
Then you need to remove the cover (this is a delicate procedure as you can easily damage the brushes).
You can clean the brushes and the commutator using a long pointed scalpel - gently scrub away the brownish/black residues on both the brushes and the commutator.
Now you need to put the motor back together, taking care not to damage the brushes when you put the cover back in place (kinda tricky but it can be done).
After closing it, see if it runs smoothly, you may want to try and run it on some 3 volts - it must run quite silently, with no more than a gentle humming sound.
If it runs ok, you should use a tiny flat screwdriver and a small hammer to bend the housing edge back onto the cover to fix it in place (basically, you need to rehammer back in the clamps that held the cover in place, this is also a bit tricky and delicate thing to do).
Now reinstall/resolder the motor back in place (motors on some brands/models can be worked without removing them).
Well, i've just told you how i repaired quite some CD drives which were virtually dead, i'm actually still using a yamaha which is more than 15 years old (i myself have been using it for at least 10 years now), i got it as a scrap piece, it returned to life after the above described procedure and it actually works perfectly up to date.
Anyway, i guess the easy way is to simply replace the motors (they need to have the same axis dimensions and mount holes as the original ones, also they need to run on the same voltage - things to keep in mind when you are looking for new motors).
Hope you can get it working...
Posted on Jul 24, 2009
Thank you for your email. The problem must have been dust. I kept putting the cleaning disc in for quite a number of times. Thankfully the problem was simple and it is playing super.
Kind regards to all.
Posted on Oct 13, 2009
This error "disc error", "no disc present" or " can\'t read cd". This all error are related to lens problem.If the lens is dirty or if the lens is got cracked or if the lens is getting blocked then it can happen.The lens is very thin glass material.You can say the lens is the "eye" of the unit.If the eye is dirty then it will not see the object.The unit needs to be opened carefully and this lens has to be checked.If any dust is collected clean it.Using the cd lens cleaner helps,but if the dust is got stuck hard or if its any other internal part then the lens cleaner will not help.If the lens is got cracked then the lens assembly has to be replaced.
You can use dry tissue to clean the lens.once the unit is opened.------------This will help.Thanks.Helpmech.
Posted on Dec 14, 2010
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Aug 23, 2012 | Nakamichi CD400 Sound Quality CD Player...
In most cases when the CD does not play it is possible that the optical head is a suspect. Sometimes it might pick up ordinary audio CD but will not play other formats. This indicates that the optical head is weak and so there is no detection or scanning of the CD . If the optical is working the tracks will be read immediately but with no scanning the laser head can be defective.
If the no disc comes even without a disc in the player you must check and see if there is a mechanical fault specially in the loading section that seems to trigger the CD mode to work.
Also check to see the main motor as it will not work in some cases as unless the tracks are read the drive motor will not work with signal from the processor. Also in some cases the central motor base can shift and so the distance to the disc can be more resulting in low detection. You can pull up the spindle to come closer.
Sometimes certain cleaner disks will not be tracked to run for cleaning as it will not be read and so will reject. Hence it is ideal to manually clean the laser head eye using a cleaning swap /cotton bud with gentle pressure on the lens eye.
If there is no result then watch if the CD spins or tries to spin. If so the board seems to work unless a test is taken on the main board but the possibility of a defective optical head can be the suspected fault.
If any of the above seems otherwise we must recheck with possibilities of a malfunction of the main processor board
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