Message from discussion Sharp MV-D2000 Laserdisc malfunction
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Date: Mon, 8 Oct 2012 11:49:49 -0700 (PDT)
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Subject: Re: Sharp MV-D2000 Laserdisc malfunction
From: Bill <highcountryri...@bmi.net>
Injection-Date: Mon, 08 Oct 2012 18:49:49 +0000
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No smoking here, but I will give that a go (not smoking, cleaning the optics ;) )
before trying the email.
Thanks for the suggestions. :)
> If it plays audio discs, but not video ones, then the problem is almost
> certainly the laser. It's not always visible dust that causes the problem.
> The optical chamber below the lens is usually open to the air, and dust will
> settle in there on things like the critical angle mirror and pickup array.
> This severely compromises the performance of the laser. Sometimes, you can
> 'get it back' by carefully holding the lens to one side, and squirting some
> dry compressed air down the gap into the optical chamber.
> Also, just because the lens didn't look dusty, that doesn't necessarily mean
> that it is optically clean. Many lasers that I see that are performing
> badly, have a sort of 'film' over the lens. This is only removed by gentle
> application of a cotton bud (Q-Tip) moistened in electronics grade IPA, and
> then the lens surface polished with a dry bud. This is very often the
> problem when the unit comes from a smoking household.