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You can't. CD/DVD or even VHS have sensors. Sensors sending information about empty or loaded. Can be laser are broken too. Laser after loaded dick try to read out information from disc, but if no info, device understand like 'empty disk' or 'just no disk'.
You can try to buy CD/DVD cleaning disc for laser clean, but if driver can't find disc perhaps it not help.
Before you attempt to repair your DVD Player yourself, make sure that you have necessary tools and test instruments like philips screw drivers, multimeter, soldering iron, soldering lead, soldering pump, etc...
This is a DVD/MIDI Player with a "no disc error" upon loading any disc that played before... Watch this VIDEO First I've loaded it with disc and observe the movement of the optical lens and the spindle motor. First thing I've noticed that the spindle motor didn't oscillate upon spinning and it's spin slowly unlike the normal RPM... I've suspected the spindle motor was already bad but still to be confirm...
Unscrew the disc holder plate from the assembly to keep away the magnet touching the spindle motor, this may affect the reading and spinning of the motor upon testing with the multimeter.
This is how it looks like after removing the disc plate holder in the assembly. Spindle motor is secured with 2 small screws in the lens assembly. Pull-out the connectors from the main board to see the underside of the tray.
You may test the spindle motor with your multimeter set in resistance measurement (ohms X1) even connected to the small board. Bad motor will read either less than 5ohms(shorted winding) or infinity (open winding) and will not spin. Good motor will read more than 50 ohms(depends the size) and will spin upon testing. Watch this VIDEO.
Onced you've confirmed that the motor was already faulty, unscrew it from the lens assembly.
Replaced the spindle motor with new one. Before you install the new motor make sure that the clearance of the disc holder is the same as the old one. Compare first the clearance because if it is to high the optical lens will not read the disc same if it is to low....
After replacing the motor re-insert all the connectors to the main board. I've load same disc which does not read a while ago and observe what will happen. Observe the disc and the sound oscillation from the spindle motor in this VIDEO. Hope that the above information, pictures, and video will help you fixing your DVD player yourself. Thanks for visiting Fixya. Have a nice day!
how long have you been using this player? The problem should be from the lens (laser).
The lens is weak and that's why it cannot read/load Cd's. .
Get a lens cleaner and use it to clean the lens, but if the lens still does the same thing even after using the lens cleaner, then it means you would have to change the whole lens completely to a brand new one.
By so doing your player would play all Cd's with no problem at all.
long reading time for cds or dvds only means that there might be dust or residues hindering your cd lens to accurately read the data of the cd/dvd. what you can do is try to clean the lens with a cd cleaner.always check the cd/dvd that you insert are clean and fre of dust . if this still wont work and the player still have the long time to read the cd/dvds, my advise is to bring this to a service center and have this checked out.