Sharp player won't recognize DVD's

Failure to play one media type, particularly the way round that you have ie plays CD but not DVD, is usually due to a defective laser. As a matter of interest, it is very rare to have any problems related to dirty lenses, on DVD players. This is because the rotational speed of the disc is so high compared to CD, that a significant drag wind builds up under the disc, which keeps the lens blown clean of dust deposits.

Arfa

Hi!

which

That's not always true. Compared to a simple audio CD player, you're right. However, any computer CD-ROM drive, CD burner, or even a CD player designed to use digital audio extraction will spin as fast or much faster than a DVD playback drive.

Besides, doesn't moving more air across the pickup just result in more stubborn dust appearing? :-)

William

"William R. Walsh" wrote in message news:xOMGf.787318$xm3.291891@attbi_s21...

Hi William,

not in my experience. In many years of attending to DVD players - since they first appeared, I don't think that I can ever remember seeing a dusty pickup, like you often see on CD players, or any playability problems being cured by cleaning a lens, which they of course often are on CD players. I was originally told the ' wind under the disc ' explanation by a Toshiba TLO on a training course he was giving, so believe it - or not, as the fancy takes you. Always seemed like a reasonable proposition to me.

You are of course correct in that computer CD ROM drives spin the disc up at very high speeds, but the fact that the drive is pretty much closed in means that they don't really get dusty anyway, and like DVD drives, they never fix by cleaning ...

None of this alters the fact that the OP's laser is still likely to be faulty d;~}

Arfa

Dust sticking depends on where you live . I dont see as much dust on a DVD lens but i have seen it . The climate is usualy very dry here and dusty . Dust sticks to the sides if furniture etc. far worse than i saw when i lived in a damper overall climate . If someone has a dirty house with carpet and dogs or kids the dust is un-controlable inside electronics here not to mention smokers film , poor cooking or fireplace or oil heat ventilation . Here i have fixed several dvd by cleaning the lens . This inclused PS2 units which kids mostly keep on or near the floor that suck in all the dirt .

I have determined that the laser works by putting in a transparent disc and looking at the laser through the disc while it searches for the dvd info. The laser is on. Any other thoughts?

ie

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Being able to see the laser burning, unfortunately does nothing to prove that the optical block overall is working, as it contains the pickup(s) as well. Also, being able to see the laser burning, tells you nothing about the output power of the laser. This is critical to correct operation of the optical block, and the following circuitry. Trust me, the lasers do wear out, and failure to play one media type, usually DVDs, is a very typical symptom

Arfa

Yes. Stop looking at laser beams! Seriously, though, an imperfect transparency might offer enough diffusion so as to decrease the danger a bit, but it's still not a bright idea [pardon pun] to look at it.

The lazer can light up real bright and still not work . I run into this all the time . Its not good to stare at a lazer