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Yamaha dual audio CD recorder and player

Discussion in 'Electronic Repair' started by N Cook, Dec 1, 2007.

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  1. N Cook

    N Cook Guest

    Someone asked me to look at this very expensive unit , but I declined.
    Not seen and model number unknown.
    Apparently there is something called OPC that checks the material of the
    blank media. About 2 out of 10 attempts to record, it drops out at this OPC
    check stage, equally so for the 2 makes of disc he uses.
    As it is still useable I declined to look at something that may well end up
    worse, and I suggested he try some other makers discs.
    Any other advice ?
     
  2. Arfa Daily

    Arfa Daily Guest

    Interestingly, the most reliable recordable DVDs that I have found, are
    Tesco's own brand. On many occasions, where owners are having obscure
    recording issues, that couldn't possibly be related to the recording media
    (could they?), moving over to the Tesco discs, has provided a complete cure.
    Might be worth a try to see if their audio recordables, are as good ?

    Arfa
     
  3. Ken G.

    Ken G. Guest

    Most of those were made by Philips . I have 2 units branded Onkyo that
    are Philips . They both have pickup problems .
     
  4. Meat Plow

    Meat Plow Guest

    http://en.wikipedia.org/wiki/OPC_Data_Access

    Don't know if this is related to your situation but read it anyway.
     
  5. N Cook

    N Cook Guest

    I've only previously come across OPC meaning optical photo-conductor
    surely this OPC means Optimum Power Control rather the Ole Process Control
     
  6. Meat Plow

    Meat Plow Guest

    Ok I've never heard of it before obviously. But I would assume it is an
    a control found in every optical recording device and not unique to the
    device you reference.
     
  7. N Cook

    N Cook Guest

    I did a bit of reading up about the technology in and around
    http://www.chipchapin.com/CDMedia/cdr3.php3
     
  8. Meat Plow

    Meat Plow Guest

    Good read and it answered a couple questions that have been floating in
    the back of my head.

    1. Why blank CDR media Branded as Music CDR exist and why it is more
    expensive.
    2. What actually was going on in the power calibration part of
    the debugging information I sometimes read in K3B DVD/CD burner for Linux
    KDE desktop.

    One thing though. The article states that stand alone CD burners need to
    use discs with special info encoded in the wobble on a blank CDR but I
    have never needed to use Music branded media in our Fostex stand alone
    studio burner.
     
  9. Arfa Daily

    Arfa Daily Guest

    Many makes take no notice of whether the disc is a genuine 'audio' one or
    not. A notable exception used to be burners from Philips. A friend of mine
    bought what appeared to be a brand new Philips disc to disc audio recorder,
    from a dealer at a radio rally. He paid silly money for it - a fiver as I
    recall. The dealer had a whole stack of them on his stand, and most were
    marked "will not record". My friend was not particularly bothered by this,
    as all he was interested in was the playback capability, which both fitted
    decks, have. However, when he got it home and tried it, using a CDR disc
    that he would normally use in his computer burner, it was apparent from the
    error message that he got, that it was not recording because there was
    something about the media that it didn't like. The next day, he popped into
    a HiFi shop that he passed on his way to one of his calls, and asked if they
    knew what the error message meant. The shop guy immediately told him that
    it was a question that he often got asked, particularly by people who had
    bought second-hand Philips units off ebay, and that all that was needed, was
    to use recording duty-paid discs, which said "audio" on them, and contained
    the digital watermark. He duly bought some, and when he got them home, the
    guy was quite right, and it recorded perfectly.

    Arfa
     
  10. Meat Plow

    Meat Plow Guest

    Yep in the States, the RIAA has to get their greedy mitts into it :(
     
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