CurtPalme.com Home Theater Forum

ruva · Joined: 25 Mar 2008 Posts: 5

Hi guys,
first post here, but long time crt and digital user.
I got a little problem with my marquee 8500LC: it seems that optical focus on the red tube is impossible to get.
Green and Blue works well, but when its time to to the side focus all I get is:
- top left unfocused, bottom right focused (not perfectly, but acceptable)
- top left focused, bottom right unfocused (not perfectly, but acceptable)

A italian technician tells me that the lenses are not good for my machine, (HD10 GT17) but I have my doubts...
The screen has a base of 215cm (86 inches) with masking system; lens throw should be no problem, since the marquee is ceiling mounted on a sort or rails; so I can move it forward or back.

Anyone could give me a clue on how to operate ?

ciao,
ruva

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

Lets first make sure its not something wrong with the electronic focus for the red channel , When looking in the tube does the grid look nice and sharp on all sides, if no try to go into individual RGB focus from the service menu. try to get a nice sharp focus on the tube face when adjusting the red. if it wont focus on the tube face you might have a bad focus modual. if it does focus then go and retry the schlumfluge adjustments for the red tube. Just go through the entire help set up menu again.

Athanasios

**Curt Palme** · Posted: Tue Mar 25, 2008 5:05 pm Post subject:

The lenses are fine. Get another tech.. Wink

I agree, check the tube focus by puttting on sunglasses, contrast at 95% and look at the image on the tube face. I'm sure it's fine, and that the problem is mechanical (Scheimpflug).

ruva · Joined: 25 Mar 2008 Posts: 5

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

it sounds like a mechanical focus issue to me. Is it possible one of the Pivot pins between the LC plates has fallen out? This would cause exactly the problem described. Read chapter 2

http://www.etechvideo.com/techtip7.htm#

JustGreg · Joined: 07 Mar 2006 Posts: 3098 Location: Kenosha, WI

Hi ruva,

First, welcome to the forum! Thumbs Up

I'm curious....did this problem just start for no reason or is it a result of 'tweeking'?...or did you just get the projector and are doing an initial install setup?

Greg

ruva · Joined: 25 Mar 2008 Posts: 5

Hello Greg, thanks !
I believe we've "met" on AVSforum...
Well, this problem started after one and a half year of NON_USE; yes my firend, I went digital...I was attracted by the dark side of videoprojection...

I must say in my defense that the house where I lived, did not permit ANY possible crt installation...ceiling was at 5 meters and room was too small; but I admit my sin Embarassed

I also admit that this is my 5th crt's, after a couple of Sim2 and ECP. The dream is still the G90....like the one Curt is selling...
Curt, what do you think: a Sim2 420HD and a marquee 8500LC fully modded in exchange for the Sony ?!?! 8)

ruva

**Curt Palme** · Posted: Tue Mar 25, 2008 10:40 pm Post subject:

I was being a bit sarcastic about firing the tech, but I'm not sure why someone would have an issue with wel recognized top of the line lenses?

I forgot about the pin on the side of the tube, that's also possibly the problem.

stefuel · Posted: Wed Mar 26, 2008 9:51 am Post subject:

Oh man, I saw ruva and without my glasses it looked like cuva. Remember him?

**Curt Palme** · Posted: Wed Mar 26, 2008 12:24 pm Post subject:

Hahaha, me too. THat was my local nemesis.. Wink

I had to deal with him until he bounced a check on me, then I told him where to go. Last I heard, he'd sold a BArco 1208 for $6K to Toronto, but shipped a BArco 800 instead. THe customer called me, as his wife happened to work for the Toronto metro police.. Wink

.

I gave them his contact info, and I believe he 'solved' the problem by sending the guy a slightly used DLP.. Sad

BTW, the above story is about 'Kuva' who used to hang at avs years ago, not ruva, just to be clear....

ruva · Joined: 25 Mar 2008 Posts: 5

Update:
looking through the lens I see a perfect focused grid.
Tried to adjust Scheimpflug but I cannot get a balanced right/left focus. ...I made the situation even worse, let me explain:
my machine is a 8500LC, which should have the lens mounting of a 9000: so on the right of the attached picture I should have left/right focus, on the left top/bottom.

Now I turn CCW the side bolt, then turn CW the top bolt but no improvement. Then I try the opposite...but nothig happen.
Could someone please explain me how the two left-right focus bolts works ?
What could be the problem (apart the pivot pin that draganm told me ) ?

thanks,
ruva

stefuel · Posted: Wed Apr 09, 2008 10:39 am Post subject:

Before you go any further, locate and download the owners/installation manual. It will explain the (lens) focus adjustments. Pointing and focussing the lenses is in my opinion the hardest thing for a first time crt'er to do. The theory behind variable lens flapping is the same whatever projector you have. Only the screws that do it differ. I seem to recall some meathead starting a thread entitled "Holy focus Guy Kuo" that explains lens focus in great detail. For the life of me I can't remember who that meathead was but the thread is a stickie here or at AVS. Wink

ruva · Joined: 25 Mar 2008 Posts: 5

Chip,
I know what you're talking about, and I've set up in the past ECP and Sim2 CRT...
This time turnig clockwise or counter-clockwise the two bolts give me no improvement on the left right focus..that's it.
Gotta go through the entire setup from scratch again....

Chuchuf · Joined: 11 Mar 2006 Posts: 548

HD10 GT17's on a 86" wide screen?? Seems like he should be running HD10L's for that width. The GT17's are for a wider screen.

Terry

nuttall_chris · Posted: Wed Apr 09, 2008 1:16 pm Post subject:

Ile · Posted: Wed Apr 09, 2008 1:31 pm Post subject:

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

Ile your wrong on the hd10 gt17's EDIT oops meant HD10L's here is the spec sheet:

And for the HD10l can go a bit wider than 58inches I believe they can go up to around 80inches look for the evrything about lens's thread.

found the thread:

https://www.curtpalme.com/forum_archived/viewtopic.php@t=2761.html

nuttall_chris · Posted: Wed Apr 09, 2008 2:27 pm Post subject:

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

Chris does the tube size matter? The lens doesnt caer what size the tube face is does it?. A certain lens should have the same specs no matter what the tube face size is correct? If I am wrong i need to understand why. does that 1 inch make the difference?

Help me out!! Wink

Athanasios

Edit I ment to say he was wrong on the HD10L's my bad !!! Sorry

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

here is a document from 3M on the delta lenses it makes no mention of tube size to be used on therefor i think it shouldnt matter what the screen width would be... however throw distance will be different possibly

EDIT Just saw the tube size mentioned but its a 7''??? weird these are used on 8" and 9" whats up with that?