Posted by Quanta on 09/26/06 06:15

<mike.j.harvey@gmail.com> wrote in message
news:1159096671.957623.51020@d34g2000cwd.googlegroups.com...
>
> geoffatmhg wrote:
>> So it is possible that one (say DVD) could be faulty and the other could
>> work. It appears that this is whats happening with my Tevion. CD is fine,
>> DVD wont play. Think I'll return it
>>
>
> Hi Geoff
>
> Yes DVD players and also computer DVD drives have separate lasers for
> the different wavelengths of laser light needed to burn and read the 2
> different types of disk. It need not necessarily be a laser diode
> itself which is faulty, there could be a fault with the associated
> circuitry, but, yes there are sufficiently separate arrangements for
> CDs and DVDs that what you describe is a perfectly plausible failure
> mode .
>

It is not only plausible, but this is the very most common failure in
players and drives.

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