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Different players have different focal ranges, or just different optics. Some discs are right at the edge of being playable in a certain player because of their tolerances (like, thickness to the recorded surface from the outer surface that affects the focal range required). With normal wear and tear, these discs will become unplayable sooner in a player in which they're marginal than in players in which they have a good range of focus.
That being said, do any discs play in that problem unit? I assume they do, but if not, it could be the playback laser diode.
But if they're not playing because that player doesn't have as good detection or focal range as the other players there's nothing really you can do about it. You can try polishing the discs but it may be a lost cause.
Assuming the player is fine, the 'Bad Disc' display message usually means either a disc which is an incompatible format (for example DVD-ROM) with this player; a disc which is a region that does not match that of the unit; or a defective/damaged disc. Check the discs prior to using them in this player and if they are burned discs, make sure they are a compatible standard format for playback.
This model is not region-free by default unless stated otherwise in the manual.
Try a different brand of blank dvd+r or -r. you will find that your dvd machine is fussy on what discs it plays. More exspensive dvd players are fussy with what dvd discs you put in, as cheaper dvd players would virtualy play most types of dvds.
Is the movie a copy or an original, some copies do not work in all machines, some will accept a dvd-R but will not work with a dvd+R except if you have a brand new unit, they usually accept most discs, the older dvd players are not compatable with all blank dvd's...Steve
the message you are getting is the machines waay of telling you that it can not read that disc. which means you will have to burn your discs in a different format. or your are using a type of disc it does not recognize.
I may have bad news for you. Here's my story with the PVD4744S.
I watched over an hour of a DVD-video disc one night, no problems. The next night, I played only the intro; then the DVD player gave a message, "This type of disc cannot be played. Please insert another disc." Thereafter, I couldn't play any of several DVDs.
The manual gives little help: http://service.us.panasonic.com/OPERMANPDF/PVD4744.PDF
My disappointment is exacerbated by the declining availability of DVD/VHS players with an RF modulator. Maybe Panasonic should create a repair kit for aging devices.
Have you tryed to use a lens cleaning disc yet. The laser lens on these players and recorders alike, must have the lens cleaned every oince in awhile. If that does not help, most likly you have a bad laser pickup assembly and you will need to replace the plaer as to have that repaiered, you could buy a new unit. Good Luck