the problem with your player may be one of several issues. When the player reads "bad", or "incorrect disk", it simply means that internal laser is not able to correctly read the disks.
This problem is usually caused by a dirty laser head, or dried up "sliders" on which the laser moves along to accurately read the disk. The other common issue is the motor that guides the laser head can wear out from use. If the motor is starting to go out, you will most likely be able to still play audio CDs, but NOT video DVDs. If this turns out to be the case, i would send your player to a local shop. But, first, I would try the following:
HERE IS THE (proposed) SOLUTION:
I have never disassembled a Toshiba player, but I would imagine it's similar to the Sharps, Sonys, and Panasonics I've worked on.
Begin by ejecting the disk tray. Without turning the power off, just unplug the player from the wall so that the tray is stuck out. (don't worry, won't hurt a thing)
Next, remove the cover. Probably two screws on either side and one or two at the top on the back of the player.
Notice where the disc tray usually inserts, and locate a little metal cover with a round plastic piece in the center. Remove all screws holding it in place. You should now see the lens assembly and two metal tracks that it moves back and forth on. Using a q-tip, apply a generous amount of grease (use something like bicycle lubricant, or any high-heat lithium based grease) to both metal tracks.
Now, gently grab the Laser assembly (without touching the lens) and slowly glide it back and forth along the tracks about five times.
Finally, using a clean q-tip and rubbing alcohol, clean the lens and then dry it off with a dry q-tip.
Reassemble all covers and screws and plug the player in.
Should be good as new! No grantees, but it’s worth a try.
feel free to email me if you still have any issues and I'll try to help.
sewellp@yahoo.com
Patrick, April 2008