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J Kildare
Joined: 28 Sep 2006
Posts: 164
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| Posted: Sat Feb 09, 2008 4:26 pm Post subject: 8500 Stig Flare problem |
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I have been fighting a problem for a while now and getting nowhere.
While adjusting stig and flare, my grid moves while ramping focus (all 3 colors different directions).
Been through numerous setups with same result.
Adjustment, Bad board?
Thanks
Jim
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Sat Feb 09, 2008 5:34 pm Post subject: |
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Bad setup of the 2 pole stig magnet. The core of the dot should be dead center, and the dots should not move when ramping focus,
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JustGreg
Joined: 07 Mar 2006
Posts: 3098
Location: Kenosha, WI
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| Posted: Sat Feb 09, 2008 5:47 pm Post subject: |
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tse, draganm, Curt, Gary, and a couple others are better versed in this and I'm curious what their take on this will be. Until then I guess I'd just ask the obvious questions;
1) Are the yokes as close to the tube bells as you can get them?
2) Did you null the CPC magnets and start from square one? eg, get the rings aligned (by turning the adjustment knobs)so that any side to side movement caused no or minimal grid movement?
3) Make sure all the card edges and connectors are cleaned? (especially the Focus Module)
Oh....I see Curt posted while I was.  Yup. Start over with the CPC's from scratch after a full reinitialization. Keep in mind that not all electronic adjustments will null after doing so. You'll have to manually null the zone focus (I think...might be zone stig...it's been so long since I've done it).
Greg
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Greg
"Is it ignorance or apathy? Hey, I don't know and I don't care!" --Jimmy Buffett
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Sat Feb 09, 2008 6:21 pm Post subject: |
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Pull the astig yoke connectors while adjusting the CPC magnets. That will save you from resetting every astig parameter to 50/50, and if there's any problem with the astig circuit, it will disable it as well. AStig failures are really rare in the set, but I have had one astig sub board on the CLM that flattened every dot when installed. I have yet to repair that one..
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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JustGreg
Joined: 07 Mar 2006
Posts: 3098
Location: Kenosha, WI
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| Posted: Sat Feb 09, 2008 7:00 pm Post subject: |
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| Curt Palme wrote: | | Pull the astig yoke connectors while adjusting the CPC magnets. That will save you from resetting every astig parameter to 50/50, and if there's any problem with the astig circuit, it will disable it as well. AStig failures are really rare in the set, but I have had one astig sub board on the CLM that flattened every dot when installed. I have yet to repair that one.. |
Awesome. I didn't know that. Nice tip Curt.
Greg
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Greg
"Is it ignorance or apathy? Hey, I don't know and I don't care!" --Jimmy Buffett
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J Kildare
Joined: 28 Sep 2006
Posts: 164
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| Posted: Sat Feb 09, 2008 9:00 pm Post subject: |
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| Nashou66 wrote: | I found that if you dont get the poles nulled after the grid will move while ramping the focus.
Nulling the Poles is Paramount to stable focus ramping.
Athanasios |
I've been using Bill Blues setup doc.
In step 4 he says to null the rings, but that is the last time it is mentioned.
Are you saying null the rings after every focus coil adjustment?
| Curt Palme wrote: | | Pull the astig yoke connectors while adjusting the CPC magnets. That will save you from resetting every astig parameter to 50/50, and if there's any problem with the astig circuit, it will disable it as well. AStig failures are really rare in the set, but I have had one astig sub board on the CLM that flattened every dot when installed. I have yet to repair that one.. |
Thanks for the tip Curt, I'll save that one.
Thanks for the reply's guys.
Jim
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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J Kildare
Joined: 28 Sep 2006
Posts: 164
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| Posted: Sat Feb 09, 2008 11:07 pm Post subject: |
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| Curt Palme wrote: | | Pull the astig yoke connectors while adjusting the CPC magnets. That will save you from resetting every astig parameter to 50/50, and if there's any problem with the astig circuit, it will disable it as well. AStig failures are really rare in the set, but I have had one astig sub board on the CLM that flattened every dot when installed. I have yet to repair that one.. |
Going to disconnect stig now. Will check ramping.
| Curt Palme wrote: | | Bad setup of the 2 pole stig magnet. The core of the dot should be dead center, and the dots should not move when ramping focus, |
G & B are dead center and very close to perfectly round, R while not as distinct is brightest dead center as well, both in the dot and the crosshair. The dots move approx the diameter of a dot, 3/8" perhaps.
Thanks
Jim
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J Kildare
Joined: 28 Sep 2006
Posts: 164
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| Posted: Sun Feb 10, 2008 1:27 am Post subject: |
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Projector is ceiling mounted
***Stig disconnected***
R & G lines are close to the same size
Contrast 100, Focus 0 -- as you ramp up red moves ccw off green about 1/4 "
B & G - Blue and green track very close with the stig disconnected.
Blue lines on left of screen are twice the size of green and get progressively larger the further right you go maybe 5 times.
(is this the gamma circuit or another problem)?
Any insight appreciated...
Jim
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Sun Feb 10, 2008 1:43 am Post subject: |
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Swap the focus leads between the green and blue tubes. The green will now adjust the blue tube and vice versa. You'll need to do some toggling of the colors so you can see what's going on, but see if the green dots now go large. I'll bet they do. If so, you ahve a bad focus board.
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J Kildare
Joined: 28 Sep 2006
Posts: 164
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| Posted: Tue Feb 12, 2008 2:44 am Post subject: |
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oops-I guess i bumped the blue lense taking off the cover.
Disregard blue problem in last post.
Blue is actually ok.
My stig and flare are perfect!! Dots are dead center.
Contrast 100 ---- With stig out of projector, when I ramp focus lines are still moving.
Contrast 45 ---- With stig out of projector, when I ramp focus lines are still moving.
WTF- Focus board?
Thanks
Jim
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Tue Feb 12, 2008 1:17 pm Post subject: |
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| J Kildare wrote: | oops-I guess i bumped the blue lense taking off the cover.
Disregard blue problem in last post.
Blue is actually ok.
My stig and flare are perfect!! Dots are dead center.
Contrast 100 ---- With stig out of projector, when I ramp focus lines are still moving.
Contrast 45 ---- With stig out of projector, when I ramp focus lines are still moving.
WTF- Focus board?
Thanks
Jim |
Try it with the astig cables connected and report back.
Athanasios
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9kids
Joined: 25 Jun 2007
Posts: 138
Location: Manassas, VA
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| Posted: Tue Feb 12, 2008 2:54 pm Post subject: |
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Maybe Focus coil centering?
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J Kildare
Joined: 28 Sep 2006
Posts: 164
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| Posted: Wed Feb 13, 2008 1:26 am Post subject: |
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| Nashou66 wrote: | | J Kildare wrote: | oops-I guess i bumped the blue lense taking off the cover.
Disregard blue problem in last post.
Blue is actually ok.
My stig and flare are perfect!! Dots are dead center.
Contrast 100 ---- With stig out of projector, when I ramp focus lines are still moving.
Contrast 45 ---- With stig out of projector, when I ramp focus lines are still moving.
WTF- Focus board?
Thanks
Jim |
Try it with the astig cables connected and report back.
Athanasios |
Thats how I had it connected originally. In Curt's 2nd post he said to disconnect to rule it out, but problem persists.
Is it possible my focus coils are screwed?
Focus board?
The thing of it is, at 1080p well focused material the image is razor sharp and very 3d.
But slightly over or under focused material just doesn't look right. (looks more out of focus than it should)
Jim
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9kids
Joined: 25 Jun 2007
Posts: 138
Location: Manassas, VA
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| Posted: Wed Feb 13, 2008 1:54 am Post subject: |
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I am pretty new to all of this, but I am pretty sure I have read, in more than one place, that if your focus coil is not centered, that when you ramp focus up and down, your raster/image will move.
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9kids
Joined: 25 Jun 2007
Posts: 138
Location: Manassas, VA
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| Posted: Wed Feb 13, 2008 2:13 am Post subject: |
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Some focus coil centering comments
| cmjohnson wrote: | Proper setup of the magnetic focus coil, once it's reconnected, should result in NO movement of the raster as the electronic focus adjustment is changed across its full range. If the raster moves, the coil is NOT
ideally centered. The more movement, the worse it is. |
From My thoughts on perfect magnetic alignment
| Gino wrote: | | garyfritz wrote: | | If I ramp focus from 0 to 100, red and blue are stationary, as they should be. But green moves. On NEC projectors that indicates your magnetics aren't right yet. Should I be concerned? |
Same thing here, magentics aren't right.
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From Marquee video oddities
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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J Kildare
Joined: 28 Sep 2006
Posts: 164
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| Posted: Wed Feb 13, 2008 4:13 am Post subject: |
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| 9kids wrote: | Some focus coil centering comments
| cmjohnson wrote: | Proper setup of the magnetic focus coil, once it's reconnected, should result in NO movement of the raster as the electronic focus adjustment is changed across its full range. If the raster moves, the coil is NOT
ideally centered. The more movement, the worse it is. |
From My thoughts on perfect magnetic alignment
| Gino wrote: | | garyfritz wrote: | | If I ramp focus from 0 to 100, red and blue are stationary, as they should be. But green moves. On NEC projectors that indicates your magnetics aren't right yet. Should I be concerned? |
Same thing here, magentics aren't right.
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From Marquee video oddities |
Thanks for the links,
I will try cmjohnson's setup tips. I have not tried a setup with the focus board disconnected.
This time I will try setting up with no focus or stig board connected.
Jim
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