Question about 3M MP 8640 Multimedia Projector

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Purple Specks on Screen

There are purple specks that show up on the screen that appear to be dust but I opened the unit and have no idea how to clean it.

Posted by Matt Jenner on

  • larryoke Mar 26, 2009

    Purple specks on the screen realise now that the lens unit needs to be cleaned but no idea how to remove it

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3 Answers

Anonymous

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Hi. I have the same problem. I `ve cleanned the lens and the lamp, but the problem still. I think is oxide on the lamp. It needs to be replaced.

Posted on Nov 29, 2009

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Anonymous

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Is there a guide for how to do this?

Posted on Jun 13, 2008

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Anonymous

HAD THE SAME PROB, YOU HAVE TO DISASSEMBLE AND CLEAN THE LENS ASSEMBLY

Posted on Nov 26, 2007

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I had the same problem. It is specks of dust on the DMD chip that the lens focuses on.

If you take it apart you can see a long telescopic lens that points at a small chip. This chip contains all the micro mirrors that produce the image.

Fortunately this sensitive item has a glass cover. Unfortunately it can be contaminated with dust. I just squirted a jet of air from a camera lens blower brush to remove the specks of dust. Problem solved.

Here is a link to a dismantling guide: http://www.flickr.com/photos/todbot/81868083/in/set-1749030/


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It is probably a speck of dust on the sensor. Get a blower from any camera shop, remove the lens,lock up the mirror (mirror lock up in camera menu) and give the sensor a good blow ( without touching it) while holding the camera front down so that any specks of dust fall away from the sensor. Sometimes specks can stick (pollen for example) in which case you could try a disposable swab and cleaning solution, although if unsure most camera shops provide the service pretty cheap - the sensor would be a lot more expensive to replace if you mess it up.
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You can take the projector apart and carefully clean the backside of the lens.
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