Originally Posted by mp06011999
As for the dust blob issues some have had....
I used to blow out the projector with compressed air until it caused me to have the dust blob issues. Anymore I just vacuum all the vents gently and do nothing of the such when I'm changing the lamp - I DO NOT CLEAN THE LAMP AREA. It seems the more I touch things the worse they get in regards to the dust issues.
As for the guy that purchased the manual and hopefully figured out how to get rid of his dust issues, please do tell us. There is nothing illegal about sharing your knowledge with others. Just don't read it word for word from a publication and you'll be fine. Please do share in what you have learned. Thanks!
*sigh*. I *may* have fixed the dust issues, but now I can't even find out. I finally got around to taking the thing apart. First of all, this is not a simple process. I'm a computer guy, but this isn't like fixing a computer. It's harder than fixing a desktop in the same way that fixing a laptop or a cell phone is harder than a desktop, but it's a degree worse than that. Upside is that I had the service manual. I wouldn't recommend you try this without the service manual unless you *really* feel confident in your skills on this type of thing. Unfortunately, the service manual stops telling you how to take the thing apart when you get to the optical mechanisms, so you have to start guessing at that point.
Anyway, I got the optical mechanism out, including the color wheel and motor. Once I took parts off the projector, I went crazy with the compressed air. What difference does it make with this point, especially if I've gotten these parts away from the optics. I cleaned off the color wheel with a microfiber cloth. I know that might have been a bad idea, but it was really dirty and compressed air was not taking care of it. When the projector is completely assembled, the color wheel is right behind where the lamp focuses the light. There's a dime-sized hole in the area that contains the lamp housing where the light goes through, and the color wheel sits a couple millimeters behind this hole. This is where the dust gets through.
Past the color wheel, there's a small squared tube with mirrors on all four sides on the inside. Completely covered with dust. I *think* this is where the dust was that was causing my problem. Not sure if I got it all out, but I got pretty aggressive about it. First of all, you'll want to detach this tube before working on it, since trying to spew compressed air through it won't help and it might just get dust further down the optical path. The tube actually comes off (be careful, it's clipped down, I kinda had to work it for a little bit). Anyway, I got it out and shot compressed air through it, which didn't completely clean it. It likes to get dust stuck down in the corners where the 4 mirrors come together. I cut a small piece of microfiber cloth and ran it through the tube multiple times. This seemed to get nearly all of it, but a few stubborn dust particles nudged in those corners. After trying to dislodge those to no avail, I finally gave up and decided to put it all back together and see if it was at least better.
I also removed the black cap that covers the first two lenses. I would recommend caution here. I *think* that the 2nd, larger lens is completely sealed, or if not then it's really close to completely sealed. This means that whatever damage you've done with dust, it probably stopped at the 2nd, larger, deeper lens. This is good for multiple reasons. One of which is that so far I can't figure out how to disassemble the main optical mechanism, and I'd like to not have to do that if I can get away with it. Perhaps all the damage was further up the line than that. But here's the warning -- first of all, once you remove the black cap, your seal is gone, and now dust can potentially get further into the optical mechanism. There's a hole past the 2nd lens into the main body which is sealed because of the lens and the black cap. Dust gets in there, and you've got to take that apart too. There are no instructions in the service manual, and I can't help you either. Anyway, I went ahead and removed the black cap and the two lenses before I knew what it looked like, and cleaned those with a microfiber cloth as well, and tried to carefully eliminate any dust sitting in this part of the light path. Unfortunately, I sat the black cap back down on the small posts it sits on incorrectly and it put pressure on the larger lens and actually ground part of the bottom of it down. Not sure this will have any optical effect since the hole into the main body is much smaller than the lens, but it did add a little *glass dust* to the area (geez!), which I cleaned out and then put the optical assembly back together, and then put everything else back together.
Of course, when I put the final screw back in to attach the outer plastic projector case back to the base of the projector, I pinched the small flat orange ribbon that goes to the color wheel assembly. I pinched it pretty bad, but when flattened back out there weren't any cuts or anything, though it's possible I broke a connection internally in that ribbon somewhere. Anyway, after resolving that, I fired up the projector.
Projector turns on, I can see that the lamp turns on for several seconds (but nothing out the front lens) and the side fans start running, then *something* whirs up for 2-3 seconds (could be imagining things, but this whir sounded louder and harsher than I remember), then whirs down. Then I get a red light with a green light flashing twice (repeating). Manual says that this means I have a damaged lamp, but that's unlikely, as the same lamp worked before I took everything apart. Seems more likely that I broke something. Anyway, I took it all apart back down to the optical assembly to see if the orange ribbon had gotten pulled into the way of the color wheel motor spinning (was that the source of the whirring sound? perhaps the small fan attached close to there?), which I thought might have been a problem, but I taped it down out of the way and put everything back together and had the same problem. Not exactly sure *what* is making the whirring sound, but it's not one of the larger intake/exhaust fans on the sides of the projector. There really aren't very many moving parts in there, and a "whirring" sound basically has to be coming from a moving part. There's the side fans (that's not it), the color wheel motor (doesn't appear to be it, and it sounded way too loud for that anyway), or the small fan that's attached to the optical assembly when you remove it from the projector. I think that's all. Perhaps that last one is it. I'll try again tonight, maybe I got something lodged in that fan (might explain the additional noise) and it's detecting the issue and shutting down before the system overheats or something. Not too hopeful, though. I think I blew it up. Hopefully at least someone else can learn from my errors.