Question about Koss KD-210 DVD Player

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How to crrect the no valid disc error when they play fine n another unit

5 discs that work fine in a different unit, bad reader or something in set up. Played very infrequently and externally clean.

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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.

Posted on Dec 08, 2014

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I posted this Jan 3, 2009 and seem to have a solution.
Similar problem. E4 54037380 Can not record on this disc. Even though it is from the same package of DVD-Rs that I have successfully recorded to previously. Contacted them about 9 months ago without a successful resolution so I am trying again. Unit will play any DVDs, will record and play back DVD-RWs but will not record on my imation DVD-Rs 8X discs that worked fine in the past. Starts to record for a few seconds and then the error message appears (sometimes with slightly different final 4 digits of error number). Other postings have suggested: maybe a firmware update is available (I requested and we will see Emerson's response), trying slower speed discs (I am skeptical since these 8x imation discs in this same package previously worked, and the instructions say 1-16x for DVD-Rs), unplugging the unit for 1/2 hour to reset the unit (did not work), playing the last disc recorded to the end and then trying a new disc (now it recorded for about 30 seconds rather than 10 seconds but then got E4 54043E02 error message, different but still did not work). So I am hoping for something more productive out of Emerson this time.
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http://www.techlore.com/article/10478/

http://www.ehow.com/how_2036277_fix-error-dvd.html

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