Continuing the Television theme …

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Continuing the Television theme …

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  • #788483
    Nicholas Farr
    Participant
      @nicholasfarr14254

      Hi Trevor Gale, I have taken it to a reputable service engineer, whose work I know can be trusted, and apparently this machine has two lasers, one for recording and playing DVD’s, and the other one for playing music CD’s. Using a good quality lens cleaner is the first thing I did, which made no difference at all, the machine will not even recognize that a blank or a commercially recorded DVD is in the tray.

      Regards Nick.

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      #788485
      Robert Atkinson 2
      Participant
        @robertatkinson2

        Many CD/DVD drives have TWO lasers one at 780nm for CDs and one at 680nm for DVDs.

        If the 680nm laser fails then the unit won’t read DVDs but may still read CD’s. This appears to be the case with Nicholas’ player. A single laser CD/DVD drive may not read some CD disks that can be read on a dual laser CD/DVD (or plain CD) dive because the structures on the disk are tuned to the relevant wavelength.

        Robert.

        #788732
        Trevor Gale
        Participant
          @trevorgale

          You are correct, as is Nicholas Farr and I was completely ignoring the dual-laser heads, going on my own experience repairing one of my DVD drives, which did have a single-laser head. I can only apologize for my misleading narrow thinking.

          #788765
          Nicholas Farr
          Participant
            @nicholasfarr14254

            Hi Trevor Gale, no problem.

            Regards Nick.

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