CurtPalme.com Home Theater Forum

Revox · Joined: 13 Feb 2008 Posts: 158

I think it's not entertaining to ask only questions, so first i'll tell something about the circumstances.
I got an two 8500 from an recycling company for 400€. Both machines have only 800Ours on the counter but the university which used these projektors drove them very hard. The green Tube got wear and a slight burn in.
The wear area on blue and red was a little bit to little for me. As a conclusion i ordered new Tubes from ebay.com .

When the tubes a ripped out it is easy to colour the red and green one. I used the glykol of old SD 187 tubes with a spotburn. Then comes the part (you know) with problems: Magnetics setup!

I red the procedure on etechvideo but still have some problems, or at least things i am not knowing if they are "normal".

1. The Astig - 2Pole settings of red is good, the "spot" is exactly in the middle of the shadow. But when i defocused, the whole picture moves a lot (at least 1/6 convergence pattern zone)

2. The Astig - 4Pole Setings controlled digitaly by the stigmator amp are realy fine in the middle of the picture on the green tube. On the left side the form of the "circle" is like a "triangle". tourning the focus yoke round the neck did not really have an influence on this.

Eventually there are amateur mistakes made by me.

I didn't enjoy the magnetic setup, especially the centering is very hard to handle with the heavy yoke.

To entertain, Photos:

Revox · Joined: 13 Feb 2008 Posts: 158

I'll take the important "DOT" picture tomorow evening. It's 2o'clock here and i fall into sleep by myself (this translation from german to english is a little bit funny).

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

to get the grid to stay straight when ramping the focus you have to go back and forth between the two pole and the focus coil till you get it not to move, that is a pain in the derrière !!!! keep at it and you'll get it but it takes time, once you do one the others come easy, also keep the clamp inside the focus coil loose too it helps with moving the coil around.

Athanasios

draganm · Joined: 08 Mar 2006 Posts: 8990 Location: Colorado

Revox · Joined: 13 Feb 2008 Posts: 158

Ok, i think ive something to do in the evening ours Wink

White balance and [...] and going nuts.

When the picture moves to right top, i must adjust the "lighter flare" to left bottom?

I think the last 5% sharpness are very hard to get, so ill take pictures in the evening and you can decide for me if i should be satisfied.

A Question for centering: one half of vertical convergence Field is to much divergence?

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

draganm · Joined: 08 Mar 2006 Posts: 8990 Location: Colorado

Revox · Joined: 13 Feb 2008 Posts: 158

I meant that i must shift the complete red colour 1/2 zone up. So Nashou66 was right in decripting my writing.
So its slowly getting dark in Berlin and i'll start the CRT soon.

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Revox · Joined: 13 Feb 2008 Posts: 158

Ok, short question before I start:
When the Focus causes nearly no shift at all, the 2 pole astig is right? Or is only the position of the focus coil right?

red and blue varied 4cm on my 165cm x 270cm screen

I tried to find the optima via the grid test pattern after the role: the "lighter" flare should be in middle of the "blur".

Two photos, camera position wasn't changed between.
For me the dots look right (but like this nice guitar tool)

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Revox · Joined: 13 Feb 2008 Posts: 158

Oh, whats the colour purity magnet?
I only have the 2 Pole astig and one magnet weel which is sticket together (can be tourned around without any influence on the grids)
Is this the CPC magnet?
I dont have a manual 4 and 6 pole manual moved magnet.

I think i don't understand what effect causes moving. For these 2 pictures, 2Pole astig looks right, centering is only "ok". But when a defocused the grid is moving to right top. What to do to compensate this movment? So the Focus coil isn't in center?

draganm · Joined: 08 Mar 2006 Posts: 8990 Location: Colorado

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Revox · Joined: 13 Feb 2008 Posts: 158

When i press the focus coil totaly down, so the picture is anything else than centered BUT the picture doesn't move when play around with the focus control. That's really strange isn't it? I agree with you that the 2 pole astig has got a slight influence on this, but not as much as i need.

It's possible, that i smashed the gear a little bit (of the 2-pole Focus), but i think it doesn't matter?

But it's a little bit better now, i think its only one thumb moving up and down (not left right anymore).

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Hmm I never seen a 2 pole only CPC magnet structure. well as long as you got the movement to only be a thumb width than your good to go. Side to side is harder to tame than the up and down from my experience, you know you can also twist the focus coil to move the grid where you want it. but id leave it where it is now if your only about and inch of movement.

Athanasios

PaulB · Posted: Thu Sep 10, 2009 8:10 pm Post subject:

I'm pretty sure 2 Pole is normal on the Marquee, or at least normal on the early models (pre VDC)??

Nice job on the Magnets, you did that in one night!!?? If mine looked like that i'd be very happy indeed!

Revox · Joined: 13 Feb 2008 Posts: 158

I think it is the second nigth. So enought is enought. Red is ok now. Green is unsharp in the bottom and not exactly round. Maybe, enough isn't enought. So now, white balance...

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Revox · Joined: 13 Feb 2008 Posts: 158

The "unsharp" green was only in the bottom line, Scheimpflug was ok. I wasn't able to get a sharper image with any possible sheinpflug. I think it's electronical. With medium contrast it's not visible.

My white balance settings: