CurtPalme.com Home Theater Forum

AvgOrdinaryGuy

How are these supposed to be oriented?

My XG has, of course, two rings for each CRT. As they are currently installed, the front rings (closest to the lense) is marked with a "T" on all three. The ring closest to the tube in marked "R" for the red tube, and "G" for the green, but the one on the blue tube is marked "R" also. Is that how they should be?

I think the blue rings should be a mirror image of the red, not exactly the same, as mine are set right now. Should I turn the blue around and have the "T" ring next to the CRT, and the "R" ring next to the lense?

garyfritz · Joined: 08 Apr 2006 Posts: 12088 Location: Fort Collins, CO

? I don't know where you're getting rings with R, G, and T on them. On an XG852 they should be marked A and B. See below, from p. 16 of the XG852 install manual.

AvgOrdinaryGuy · Posted: Wed Aug 08, 2007 11:16 pm Post subject:

Yes, Gary, the label on the projector frame looks just like the one in the manual. And the A tab would be closest to the CRT, B next to the lense. The rings themselves, that have the tabs ("knobs" in manual) on them have the "T" and "G", "R" molded into them just below the tab, the letters are not visible without removing the rings. They are not labeled A and B like the label or the manual.

It's not a matter of how to adjust the rings, but how to make sure they are installed correctly. I need to know the correct orientation of the rings, so that when I adjust them according to the manual, I will have the correct lense angle. In other words, is the A ring the one with the "T" on it, and the B ring the one with the "G" etc. on it?

Surely someone who has experience working on, or re-tubing XGs, would know this. Mark, Curt?

Mark_A_W · Posted: Thu Aug 09, 2007 12:13 am Post subject:

Give me a few days - I have to dig through the shed to find the AC tube housings I have buried somewhere. It'll be the weekend before I get to look.

I just don't know the answer off the top of my head, sorry.

AvgOrdinaryGuy · Posted: Thu Aug 09, 2007 1:52 am Post subject:

OK Mark, that'll be great. I don't really need to know right away anyhow. I'm going to be replacing a tube (that hasn't come in yet) and want to make sure I have everything back in place correctly.

garyfritz · Joined: 08 Apr 2006 Posts: 12088 Location: Fort Collins, CO

AvgOrdinaryGuy · Posted: Sat Oct 27, 2007 8:50 pm Post subject:

Well, I still have not got around to putting the XG back together. And it looks like nobody remembered to check into this for me... So here is a friendly reminder. If you have an XG with the lenses off, could you take a peek at these rings and let me know how they are oriented?

larryk · Joined: 23 Aug 2007 Posts: 106 Location: Edmonton Alberta

I took a look at the rings on my PG9xtra which I believe will have the same charactoristics as XG and although I did not take the rings off I observed that both the blue and red rings appear to be the same, not a mirror image but they appear to be interchangable. You cannot turn any of the rings around as that would screw up any normal adjustment that they are intended to provide. Hope that helps. I do have a set of XG rings that are out of my 1100 but they are sitting at the CNC shop, I am waiting for them to cut my new rings that will allow full infinate adjustment. They promised them by first week of Oct. at the latest and still waiting....
If they work as planned I will be selling them on Curt's site.
Larry

AvgOrdinaryGuy · Posted: Tue Oct 30, 2007 10:22 pm Post subject:

Thanks, Larry, I guess that helps a little. I'm having a hard time understanding how the red and blue could be directly interchangable, since the inside spacing is usually slightly greater than the outside for each of the blue and red lenses. it seems that the spacers would have to be opposite (like a mirror image). If both sides have the same rings, that would mean that if on the blue side the outside has less spacing than the inside, then on the red side the inside would have the lesser spacing. That can't be right, can it?

They way I understand it, as the blue and red crt/lense combination is toed in for convergence, then the lenses must be shifted slightly to the outside off center to compensate for the different distances to the right and left sides of the screen. So since you can't converge on green by aiming both red and blue guns in the same direction, I don't think you can compensate for Scheimpflug if both lenses are adjusted in the same direction. Am I wrong? What am I missing here?

Mark_A_W · Posted: Tue Oct 30, 2007 11:54 pm Post subject:

I'll have another look in the shed - they are seriously buried under a huge pile of junk somewhere. But from memory they are all the same.

Mark_A_W · Posted: Sun Nov 04, 2007 8:55 pm Post subject:

I'm really sorry. I've looked and looked - good excuse to clean my shed, but I can't find them.

I'll have one more look today.

AvgOrdinaryGuy · Posted: Sun Nov 04, 2007 9:41 pm Post subject:

Thanks for the effort, Mark. If I don't get a definitive answer before I get ready to re-assembly the projector, I will just go with my assumptions and see how it works out. If it's not right I can always turn them around and see what kind of difference it makes.

dbaisey · Posted: Sun Nov 04, 2007 10:26 pm Post subject:

I have never had a reason to take these apart and no sheets that I have show it indicated. I don't have a XG852 or a non LC to take a look at now but I did take a look at the PG Extra.

The lens side all say T B on all three colors. The inside ring has R for red and G B for the green and blue. The line down the middle of the tabs (indented) are facing outward on both. Doug

If someone has a non LC XG with the lenses off you can see it without taking apart, just look close pressing the ring in. The mount lug is marked which color with a punch stamp 'dot'

AvgOrdinaryGuy · Posted: Sun Nov 04, 2007 10:57 pm Post subject:

Doug, I didn't really have a good reason to take it apart either, just was curious about how the thing is put together. But once, I got it apart, I didn't think it looked right.

dbaisey · Posted: Mon Nov 05, 2007 12:48 am Post subject:

The green has G B on it and the blue has G B on it also. Doug

AvgOrdinaryGuy · Posted: Mon Nov 05, 2007 1:13 pm Post subject:

Hmmm, so although the rings are a little different on my XG and the PG Extra, it appears that the green and blue rings are supposed to be the same. Seems strange (since the green needs no lateral adjustment, and I would think the blue would), but I won't worry about it. I'll just assemble the projector that way and be satisfied.