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NEC PG6 Issue

712 Views 20 Replies 9 Participants Last post by Moosilla, Dec 31, 2005

Moosilla

Discussion Starter · Dec 30, 2005

I have started the process of setting up a NEC PG6 for the first time. (I know Barco CRTS rather well ... but the NEC's is rather different)

I placed the projector square to the screen at the appropriate distance, level with the bottom of the screen (Front projected on a 4.5x6' screen (90" diagonal))

I followed Curt P's Mechanical setup steps which I beleive that I did correctly ... and I moved onto the initial electronic Geometry and convergence and I have run into a problem.

I have a HUGE horizontal pincusion on the top and bottom that I cannot get rid of, I run out of electronic adjustment .... plus I have a weird "hook" in the horizontal lines at the extreme right side of the image on the right side of the screen (Video only, at 1024x768 it is not there)

The pincusion gets worse at higher resolutions for some reason

Am I missing something, forget a step or is there a board level problem that is existing within the projector ?

Any asistance or direction would be appreciated.

I would post a picture but as this is my 2nd post I am not yet permitted to

Thanks

Andrew

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1 - 20 of 21 Posts

Mark_A_W

· #2 · Dec 30, 2005

Sounds like your yoke connections on the C-drive (UNDER the hinging Deflection board) are set incorrectly.

There are two sets of connections to switch to change from Ceiling to Floor. The ones on the Def board, and the ones on the C-drive. The correct settings are shown on a sticker inside the main cover.

Mark

Moosilla

Discussion Starter · #3 · Dec 30, 2005

Quote:

Originally Posted by Mark_A_W
Sounds like your yoke connections on the C-drive (UNDER the hinging Deflection board) are set incorrectly.

There are two sets of connections to switch to change from Ceiling to Floor. The ones on the Def board, and the ones on the C-drive. The correct settings are shown on a sticker inside the main cover.

Mark

Ahhhhhh Thanks !!!! .... I was so excited I found the connectors on the Deflection board I missed the ones on the C-drive ... and there is NO sticker on the cover unfortunately to illustrate the error of my ways ....

Now I have to go back and redo the raster centering and initial mechanical setup

Sooo I seem to have solved the nasty pincusion problem ... but the "hook" at the right side of the screen is still there with video - signals ...but one step at a time ... I will ignore it for now and work on ED / Computer resolutions for now

Thanks

Andrew

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Mark_A_W

· #4 · Dec 30, 2005

Have you got the PG manual then? Because you have to get those connections right, and it varies from PG to Plus to Xtra..

Video doesn't matter - you just use that to set the H-width pot to 1.80v +-0.1 measured at PA pin 2 (all on def board, and it's H-width, not H-size pot), with a video signal and H-amplitude at +100%.

Then you'll never use video again

Moosilla

Discussion Starter · #5 · Dec 30, 2005

Quote:

Originally Posted by Mark_A_W
Have you got the PG manual then? Because you have to get those connections right, and it varies from PG to Plus to Xtra..

Video doesn't matter - you just use that to set the H-width pot to 1.80v +-0.1 measured at PA pin 2 (all on def board, and it's H-width, not H-size pot), with a video signal and H-amplitude at +100%.

Then you'll never use video again

YUP ...I have the manual ... it is all good ... I am rough aligned at 1024x768 ... I am going to run a video thru my PC as a quick test before I go back and get serious at the alignment .... I just want to see an image

Thanks for all your help !!!!!

Andrew

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Tinman

· #6 · Dec 30, 2005

The "Hook" is probably caused by the PHASE adjustment. You need to go into PHASE, and set it so both sides are EQUAL. They will both be bent, but should be equal.

That should do it. Phase has to be set for a new signal.

Marc

clopez

· #7 · Dec 30, 2005

What version of 6pg do you have PG6000 or the plus.

clopez

flyingvee

· #8 · Dec 30, 2005

Quote:

Originally Posted by Tinman
The "Hook" is probably caused by the PHASE adjustment. You need to go into PHASE, and set it so both sides are EQUAL. They will both be bent, but should be equal.

That should do it. Phase has to be set for a new signal.

Marc

Marc - how does one know WHEN phase is equal? That is probably my biggest problem with my 980 Ultra - have been setting it more or less randomly in the middle of the range, hoping it is "right." - I know, you move curser to the left, until the LHS bends; then move it to the right until the RHS bends. But that leaves a range from about -40 to +17 -- have tried the center position, by averaging. Still have a hook on the lower RHS. Is there any way to know where in that range between the onset of edge bending that the correct phase point is? (If I could run the phase adjustment while the test pattern was onscreen, that might solve the problem, but on my set, whenever I hit PHASE, I am dropped into the phase test pattern.)

Sorry if hijacking, but I have been trying to get my phase right, and the hook gone for over a year. (by hook - there is a pronounced droop down of the crosshair test pattern, on the lower right corner. about one or two crosshatches worth.) I just want to finally get this right - I have added the VP30 to the system, and now want to get my convergence spot on. Thanks.

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Ricardo Cruz

· #9 · Dec 30, 2005

Quote:

I hit PHASE, I am dropped into the phase test pattern.)

If you select Test... Cross("x") when you are in Phase adjust you can select another pattern. THEN if you move the horizontal keys on the remote you're back to the phase pattern; if the vertical keys you stay in the cross pattern (mmm, not absolutely sure, might be the reverse is true, you have to experiment).

This won't get you rid of that hook though I guess. It's not related to Phase adjust. It's some kind of distortion on the top/bottom part of the raster.

flyingvee

· #10 · Dec 30, 2005

Cool - thanks for the tip - will try it when I get home. In the immortal words of Ed McMahon, "I did not know that."

Moosilla

Discussion Starter · #11 · Dec 30, 2005

Quote:

Originally Posted by clopez
What version of 6pg do you have PG6000 or the plus.

clopez

I have the PG6000 ...

Andrew

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Marshall F

· #12 · Dec 30, 2005

Jon, I think you are doing it just right. Take the average of -40 and 17 and you've got it, which should be -11 or so. Jon, just curious - when you look for the hook, are you looking on the screen or into the lens?

Marshall

flyingvee

· #13 · Dec 30, 2005

On the sceen. So projected, it is the lower rhs. Has been there almost from day one, and is more pronounced now that I am running 720p and 960p. Used to run 480p, and had that tamed. At the higher resolutions, the entire lower line of crosshatches (from internal test patterns) are kinda funky - wavy actross the bottom, not a straightforward pincushion or keystone thing, but an actual non-straight line. (which, I realize, is no longer a line, by definition

)

Willie

· #14 · Dec 30, 2005

Quote:

Originally Posted by Tinman
Phase has to be set for a new signal.

Marc

Marc,

Since I generally create 1 signal entry, and then copy it when entering a new signal and tweak it; that would suggest I need to tweak the phase as well. Is that correct?

Willie

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Tinman

· #15 · Dec 31, 2005

Quote:

Originally Posted by Willie
Marc,

Since I generally create 1 signal entry, and then copy it when entering a new signal and tweak it; that would suggest I need to tweak the phase as well. Is that correct?

Willie

You shouldn't copy an entry and tweak it everytime. You introduce an ever increasing error. Best is to always build a new signal from scratch. This MAY explain your problem. You could have enough garbage data in your setup memory that you can no longer get a clean entry. If all else fails, delete all entries, then normalise everything and build new from scratch.

Doug can explain this better, but I have seen the result of data corruption while Doug was here one day. In that particular case, I think he had to do a full reset, but I would not recomend this unless ALL other avenues fail.

Happy new year, BTW.

Marc

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Chris Bigos

· #16 · Dec 31, 2005

Quote:

Originally Posted by flyingvee
the entire lower line of crosshatches (from internal test patterns) are kinda funky - wavy actross the bottom, not a straightforward pincushion or keystone thing, but an actual non-straight line. (which, I realize, is no longer a line, by definition

)

If it's just the vertical lines at the extremities of the internal cross hatch pattern "zig-zagging" then don't worry about it - they do that!

Tinman

· #17 · Dec 31, 2005

Quote:

Originally Posted by Chris Bigos
If it's just the vertical lines at the extremities of the internal cross hatch pattern "zig-zagging" then don't worry about it - they do that!

Really? Mine doesn't.... But if it's OUTSIDE the active image area, then I agree. Don't worry about it.

Marc

Moosilla

Discussion Starter · #18 · Dec 31, 2005

Well it is up and running ... not 100% yet but it is getting there.

I have to finish configuring the media PC and then work on the final tweeks.

The Dining room was converted (rental unit) ... WAF is no longer an issue

The 5th Element looked pretty good ... I am stoked for when it is really tweeked out !!!!

http://i.pbase.com/o4/66/532966/1/54169482.Theatre.jpg

Thanks again to all those who helped !

Cheers

Andrew

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Tinman

· #19 · Dec 31, 2005

Andrew, have you thought about a coffee table setup and lowering the screen just a little for it? You could gain a table in there when you are not using the NEC. Since hanging it on the ceiling is obviously not an option. The NEC IS sitting on it's 4 feet, right? (For cooling)

Above all, have fun and enjoy.

Marc

flyingvee

· #20 · Dec 31, 2005

Quote:

Originally Posted by Chris Bigos
If it's just the vertical lines at the extremities of the internal cross hatch pattern "zig-zagging" then don't worry about it - they do that!

Chris - thanks, - yes and no. The vertical lines at the very top and bottom of crosshatch go extremely crazy - like the symbol for a resistor - at 720p, but it is outside the picture area, so I have learned to ignore that. But the horizontal line is gently wavy - not just angled or pincushioned, but goes up and down from horizontal several times.

I reckon I need to do as has been strongly suggested above, and start over with a memory block from scratch. I admit, I've been taking blocks that more or less work, and then adjusting them to work at new res, rather than starting from scratch.

Is there any way to get a block at all 0 or centered, other than just going thru every setting one at a time? And thanks again - I know I was bad - just wanted to try new res, without 2 hour setup for each one. Will post back after have started from 0, with luck that will fix the problem.

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