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Pioneer DV-344

Discussion in 'Electronic Repair' started by paul, Apr 19, 2004.

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  1. paul

    paul Guest

    My 2 year old DVD player has started to give trouble. Initially it would
    sometimes refuse to recognise homemade VCDs that I had made - "No Disk"
    either when I put them into the machine or part way through playing them.
    I thought it was because I was using a different type of blank media. But
    then it started doing it with others - homemade music CDs and I think the
    other day a commercial CD stopped playing after about halfway. It still
    has no problems with DVDs but I primarily bought it for my homemade VCDs.

    Any ideas on how I can fix this? I have taken it apart and cleaned the
    lens to no effect.

    Thanks
     
  2. Jerry G.

    Jerry G. Guest

    Try cleaning the laser lens. Most likely the laser unit is becoming weak.

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    My 2 year old DVD player has started to give trouble. Initially it would
    sometimes refuse to recognise homemade VCDs that I had made - "No Disk"
    either when I put them into the machine or part way through playing them.
    I thought it was because I was using a different type of blank media. But
    then it started doing it with others - homemade music CDs and I think the
    other day a commercial CD stopped playing after about halfway. It still
    has no problems with DVDs but I primarily bought it for my homemade VCDs.

    Any ideas on how I can fix this? I have taken it apart and cleaned the
    lens to no effect.

    Thanks
     
  3. Pioneer's use a dual-wave laser. Apparently that portion of yours is getting
    weak, since cleaning did not help.

    This probably puts this unit out of the range of an economical repair.

    Mark Z.
     
  4. paul

    paul Guest

    What exactly does dual wave laser mean?
     
  5. It means the laser can operate at two different frequencies, one of which is
    more compatible with DVD discs, the other more so with audio and CD-ROM type
    discs.
    Most earlier DVD players wouldn't play CD-R's because the dyes used were
    invisible to a red laser. Some of these, like Sony, would still play CD-RW,
    but my Onkyo would not, probably a firmware restriction.

    Mark Z.
     
  6. paul

    paul Guest

    So if my player plays DVDs and not CDs then the laser must work but the
    part that generates the other wavelength does not? ny ideas where to look
    for the fault?
     
  7. It's VERY probably still a bad pickup. Better than a 95% chance, I would
    say.

    Mark Z.
     
  8. Paul

    No, they usually have two lasers. Changing laser
    colour is a complicated business.

    Mark's comment about a Sony playing CD-RW but not
    CR-R, while an Onkyo would not, is not always as
    a result of firmware. The contrast ratio of CD-RW
    is much less than CD-R so many CD players (and quite
    a few DVD) players can't make sense of it. Some
    DVD players get confused and think they are looking
    at a DVD, in which case firmware might be a cause.

    Colin
     
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