WARNING! Elite: Do not remove back of optical cavity

Discussion in 'Archived Threads 2001-2004' started by Robert P. Jones, May 27, 2001.

  1. Robert P. Jones

    Robert P. Jones Second Unit

    Jun 18, 1999
    Likes Received:
    This is reprinted from an Elite focussing thread, on another forum. It is critically important information, so I'm giving it its own post here.
    It is very important if doing optics cleaning or optical focussing, or the Duvetyne op, or any other reason to get into the optical cavity on an Elite:
    Whatever you do, NEVER GO INTO THE OPTICAL CAVITY THRU THE BACK, ON AN ELITE UNIT!!! You'll be digging a grave for yourself.
    On the unit I experienced this on, there were a couple of weird, uncommon-head screws holding the back on the unit, among the regular Philips head screws. DON'T DEFEAT THEM! THEY ARE THERE TO PROTECT YOU FROM YOURSELF! A small flat ecge screwdriver can be used to circumvent them, but you'd be shooting yourself in the foot, just like I did on one of them, just to be a smartypants and get in anyway.
    Certain of the older ones - and possibly the newer ones, I don't know - have the bottom edge of the mirror bracketed into the removable back, and the top edge bracketed into the body of the TV itself.
    You separate those by taking the back off the unit, and your mirror slips out of the top one and does a nosedive straight into your fresnel screen!!! No way to stop in once it's in the process. Once you actually know what you have done, and the damage is on the way, there's nothing you can do to stop it, because you're standing there holding the huge, bulky back of the optical cavity in your hands, which has just pushed backwards and into your hips for some unknown - uh, oh - reason...
    And it's big, heavy, and extremely ungainly. You're stuck with that huge peice of plastic in your hands, and in that next microsecond you can't do anything but endure the horror of what is about to take place, at your OWN doing. And it then DOES then immediately take place, right in front of your eyes.
    I've seen it break the mirror and totally trash the fresnel screen, costing bundles.
    ALWAYS GO INTO THE OPTICAL CAVITY FROM THE FRONT, on an Elite unit of ANY age, just to be safe.
    To go in thru the front:
    The front's frame usually comes off via unscrewing the Philips head screws at the bottom of the frame. You get to those screws by removing the ornate plastic plates that say Pioneer, etc. on them, that are about a foot wide and an inch tall, forming the cosmetics separating the screen above from the speaker grillcloth section below. One on each side of the unit, you stick your fingers under them and they pull off easily if done gently, once the speaker's grillcloth plate has been yanked off. That takes a little more force...
    The screen frame comes off by lifting it straight up or out at a 45d angle and then up. This reveals the 2 layer screen sandwich: the fresnel closest to the mirror, the lenticular facing the viewer.
    The screws to remove this sandwich are then pretty obvious.
    The upper left corner's holder will be the only one where you actually have to remove a screw. The others allow their holders to be removed by just loosening up their screws a bit and de-slotting the holders from them.
    Be sure NOT to grab the screen by its attached aluminum brace at the top of the 2 layer sandwich, laying horizontally. It is NOT attached - just laid on there for bracing and derippling purposes - and the stack will fall out of your hands directly, if you try to hold it via this piece of aluminum.
    Also beware of turning this sandwich sideways once it's off. Keep it horizontal, or the very flexible lenticular will have a tendency to waffle and bend in half on you, via gravity. I had one split itself on the edge of the frame on its way to the ground once. Cost a bundle to replace.
    After you're in that far, I suggest that you perform my Cantilever Technique - found at the Keohi Tips and Tweaks website - for the most comprehensive and exacting optical focussing available, on any RPTV.
    Mr Bob
    Robert P. Jones
    Image Perfection
    San Francisco Bay Area, USA
    [email protected]
  2. Jay Mitchosky

    Jay Mitchosky Producer

    Sep 6, 1998
    Likes Received:
    I remember reading of this some time ago. Ouch!
    [email protected]
    My Home Theatre Pictures...
    "You're no mesiah. You're, you're a movie of the week. You're a ... t-shirt, at best."
  3. MarcS

    MarcS Stunt Coordinator

    Feb 24, 2000
    Likes Received:
    A little OT, but about focusing... I found that my blue lens was already against its left stop, which limited my ability to find the "perfect" focus since I couln't range on either side of it.
    Suggestions or solutions?
    (Pioneer SD582)

Share This Page