CurtPalme.com Home Theater Forum

[CSX]

Greetings all. I just recently picked up a 9500LC, and have been going over the unit with a fine tooth comb before installation is to begin.
I have a couple issues which I feel that warrant external opinions, outside of what I have learned from searching / google / forums.

1. The green CRT chamber was packed with orange goo, after the coolant was drained.
During removal of the C element, it slipped and tapped the bottom edge of the chamber. This resulted in a scratch on the C element,
A. Is the scratch going to affect clarity? It took a bright room and a flashlight to get this scratch to photograph.
B. I have scrubbed the CRT and the frame continuously with 91% isopropyl alcohol, but the orange goo is slow to remove. I haven't found any similar cases online to follow as an example.
-The chamber has no pitting
I am planning on coating the interior chambers with epoxy based black paint anyways, should this be efficient after application to prevent a re-occurrence?

2.During removal of the blue CRTs clear C element, the side was nicked.
A .Is this harmful to the C element in anyway, as far as diffusion ability?
B. There are pre-existing scratches on this C element. Can it benefit from a replacement?

I have attached a plethora of images to highlight all these conditions. Any feedback would be greatly appreciated.

[Nashou66]

Only way to know is to put it back together.

If you'd new bellows click the link in my Sig.

But that Green chamber looks nasty!!

If using VHT epoxy paint make sure you let it cure for at least a week.

Athanasios

[barclay66]

Hi,

Regarding the scratches on the C Elements:
Scratches, dirt and other defects will only show on screen when present on a surface where the projected image is focused (focal plane). As far as I know for the C Elements this isn't the case so You should be fine.

Regarding the dented edges on the C Element:
Dents on the outside (the side where the metal ring with the four bolts goes) are almost never a problem as there's a lot of surface contact between the ring and the C Element. Dents on the inside can cause leaks if they are too large as this is where the bellow seals against them. In this case I'd look for the chopped-off pieces, glue them back in with superglue (cyanoacrylate based glues work well) and smooth the surface (sanding&polishing) around the glued-in piece. Otherwise it might be necessary sealing the C Element with RTV against the bellow.

Regarding the residues inside the chamber:
Try different solvents. The residues might not be based on a kind of grease. They might be based on mineral precipitates and could be dissolved using demineralized water. It is essential that You get rid of any residues as they might be the starting point for future problems.


Regards,
barclay66

[Curt Palme]

Replace the fill screws and rubber washers at the top of the tube, that's where the discoloration is coming from. I've got stock, as well as glycol if you need it

[Curt Palme]

Replace the fill screws and rubber washers at the top of the tube, that's where the discoloration is coming from. I've got stock, as well as glycol if you need it

[CSX]

Thanks for all the input so far.
I'm probably going to end up using the VHT paint on the green chamber.
The bellows for the chamber failed at the edge of the C element retainer during removal, replacement will be mandatory. I'm going to do all 3 since I am knee deep in this machine, anyways.
Should I apply VHT paint to all chambers, even though it's the only chamber with a growth issue, currently?
I probably shouldn't operate the projector without coolant in chambers, no matter how far I have the machine stripped down, and I would hate to build the machine up only to have to pull C elements, again.
What is the general opinion on diffusing a very bright LED light source behind the C elements, and using that to spot check for potential artifacts from scratches?

[Nashou66]

I think it be fine, the scratches on the edge should not show up in the image and as said earlier it is out of the focus plane so it should be ok.

Id only do the green in the paint. Some use Black Silicon and smear it all over the exposed metal after putting the bellows on.

Id rather clean the Face plate right down till no old silicon is on it and then use the new bellows with no RTV( silicon)

Athanasios

[CSX]