| Author |
Message |
DisTreSs
Joined: 19 Nov 2007
Posts: 39
|
| Posted: Tue Nov 20, 2007 7:24 pm Post subject: Rastermaster (BG808s setup) |
|
|
Ok, so, still figuring out how to set-up my new toy and have performed what I believe are the basics:
- Checked to see that the PJ is perpendicular
- Aligned the green tube to the center of the wall I will be projecting on (screen to follow shortly...)
- Deleted all mem blocks
- Set everything to midposition
- Took off the lenses to check the raster on the tubeface....
... and thats where I ran into the following:
To my untrained eye, the raster seems to be rotated somewhat. The red and blue tubes exhibit this to a slighter degree aswell.
So now I'm looking for a 'rastermaster'  that can tell me whether this is normal behaviour (taking into account everything has just been reset) and that I have to make geometry adjustments starting from here to correct this for my BG808s.
Thx in advance guys!
|
|
| Back to top |
|
 |
Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
|
| Posted: Tue Nov 20, 2007 7:37 pm Post subject: |
|
|
Jah mon, you rang?
Oh, you wanted a rastermaster, not a rastamaster! (oh I crack myself up!)
The yoke on the tube is indeed twisted a bit, but that's not unusual really. You can loosen the yoke and rotate it slightly if you want, but
I'd just use the skew/tilt controls in the menu to rotate them to the correct position.
|
|
| Back to top |
|
|
DisTreSs
Joined: 19 Nov 2007
Posts: 39
|
| Posted: Tue Nov 20, 2007 7:48 pm Post subject: |
|
|
 yup that was pretty much what I was getting at, though I was still hesitating to go with 'rasterfarian'. Didn't have such a nice ring to it though
Ok, I'll try using the skew/tilt controls first and see where I end up as I have no idea how to adjust the yokes right now so it might be harder to setup through the menu but I think I will still win some time this way.
Am I correct in assuming that if I set the raster up correctly on the tube face via the genlock pattern, I still have to go to the installation menu to perform the crosshair alignement and such?
I discovered yesterday that I was able to line those up in the horizontal field but in the vertical, red and blue were always elevated compared to green...
In other words, does the raster setup in random access also influence the position of the crosshairs in the installation?
|
|
| Back to top |
|
|
DisTreSs
Joined: 19 Nov 2007
Posts: 39
|
| Posted: Sun Nov 25, 2007 8:23 pm Post subject: |
|
|
So I finished setting everything up during the course of last week and even though I'm convinced there is still a lot of room for improvement (more on that below) I thoroughly enjoyed my new toy!
I can only say: I'm hooked!!!
Now who has a nice spare 9" lying around... ? 
Just kidding, I'll get there eventually though but for now I've just about spent all the extra cash I could on this one
Anyway, the things I still have problems with, is that for starters the raster is impossible to get perfect. I still have some seagull going on in the bottom left hand section, but I've reduced it to a minimum and decided I can live with that. Could be that this is the consequence of having to do too much skewing to compensate for the fact that I decided not to touch the yokes... ?
Secondly I was able to line up the crosshairs perfect for B on G, but R on G is still a bit of a problem. I can line up the crosses for about 90%, but the line of the red crosshair is simply not perfectly straight and it is therefore impossible to converge 100%.
Most importantly though is that I'm having serious focussing issues on green. I of course focussed mechanically first and was able to get spot on center-screen, I really mean razor-sharp here. Unfortunately, on the outside of the screen, this is the total opposite. No amount of lens adjustment or even scheimpflug tinkering is letting me get close to anything near ok so I'm kind of at a loss now. Added to that, is that electronic focussing is doing absolutely nothing either... 
When I try to focus electronically, all I am able to do is tweak the midpoint further, but other controls for the remaining portion of the screen (left, right, bottom, top) are doing nothing at all. Not even the slightest change!
Focussing of Red is perfect by the way and Blue is ok too, but green is simply not good enough. The lines are on the outside of the screen are getting close to 1" in width just to give you an idea...
Anyone any ideas??
|
|
| Back to top |
|
|
Fujifrontier
Joined: 20 Oct 2007
Posts: 354
Location: San Antonio, Texas
|
| Posted: Sun Nov 25, 2007 11:30 pm Post subject: |
|
|
|
pictures`
|
|
| Back to top |
|
|
DisTreSs
Joined: 19 Nov 2007
Posts: 39
|
| Posted: Mon Nov 26, 2007 7:40 pm Post subject: |
|
|
Not easy with my teeny-tiny digicam but here goes nothing.
|
|
| Back to top |
|
|
perisoft
Joined: 29 Aug 2007
Posts: 2920
Location: Ithaca, NY
|
| Posted: Mon Nov 26, 2007 8:14 pm Post subject: |
|
|
| DisTreSs wrote: | So I finished setting everything up during the course of last week and even though I'm convinced there is still a lot of room for improvement (more on that below) I thoroughly enjoyed my new toy!
I can only say: I'm hooked!!!
Now who has a nice spare 9" lying around... ?
Just kidding, I'll get there eventually though but for now I've just about spent all the extra cash I could on this one
Anyway, the things I still have problems with, is that for starters the raster is impossible to get perfect. I still have some seagull going on in the bottom left hand section, but I've reduced it to a minimum and decided I can live with that. Could be that this is the consequence of having to do too much skewing to compensate for the fact that I decided not to touch the yokes... ?
Secondly I was able to line up the crosshairs perfect for B on G, but R on G is still a bit of a problem. I can line up the crosses for about 90%, but the line of the red crosshair is simply not perfectly straight and it is therefore impossible to converge 100%.
Most importantly though is that I'm having serious focussing issues on green. I of course focussed mechanically first and was able to get spot on center-screen, I really mean razor-sharp here. Unfortunately, on the outside of the screen, this is the total opposite. No amount of lens adjustment or even scheimpflug tinkering is letting me get close to anything near ok so I'm kind of at a loss now. Added to that, is that electronic focussing is doing absolutely nothing either...
When I try to focus electronically, all I am able to do is tweak the midpoint further, but other controls for the remaining portion of the screen (left, right, bottom, top) are doing nothing at all. Not even the slightest change!
Focussing of Red is perfect by the way and Blue is ok too, but green is simply not good enough. The lines are on the outside of the screen are getting close to 1" in width just to give you an idea...
Anyone any ideas?? |
That really looks like optical misfocus in the corner. Generally that manifests as everything being blown out in one direction if you're focussed too far, and sucked in in the other if too near (or so).
You might have your astig way, way, way off, but I'm not sure an astig adjustment can throw something off quite like that.
You're sure there's not some mechanical problem with the lens on the green tube? Try swapping lenses?
Also, look in the lens, or better, pull off the lens, put on a pair of sunglasses, and look at the tube face to see if the focus is wrong there. If it is, it's an electronic problem; if not, it's optical.
_________________
|
|
| Back to top |
|
|
DisTreSs
Joined: 19 Nov 2007
Posts: 39
|
| Posted: Mon Nov 26, 2007 8:29 pm Post subject: |
|
|
thx perisoft, I'll try swapping lenses to see if the focus problem stays with the lens.
I already had them off when I centered the raster and on the tubeface I didn't notice anything special. Looks pretty sharp across the entire surface.
As far as optical focus is concerned, I adjusted it across the entire range for the lens and this is the best I can get it.
Do you also have any idea why the focussing controls in the menu do not respond to anything but midpoint focussing?
Thx
|
|
| Back to top |
|
|
perisoft
Joined: 29 Aug 2007
Posts: 2920
Location: Ithaca, NY
|
| Posted: Mon Nov 26, 2007 11:54 pm Post subject: |
|
|
| DisTreSs wrote: | thx perisoft, I'll try swapping lenses to see if the focus problem stays with the lens.
I already had them off when I centered the raster and on the tubeface I didn't notice anything special. Looks pretty sharp across the entire surface.
As far as optical focus is concerned, I adjusted it across the entire range for the lens and this is the best I can get it.
Do you also have any idea why the focussing controls in the menu do not respond to anything but midpoint focussing?
Thx |
If your edges are unfocussed to begin with, it's hard to tell the difference that electronic focus makes. Again, it can help a lot to turn down the contrast, look into the lenses, and see there. Also, for focus, it's much easier to hook up a PC and use something like Nokia Monitor Test to throw hatches on the screen; trying to focus with big blocky lines every 100 pixels is an exercise in frustration.
_________________
|
|
| Back to top |
|
|
DisTreSs
Joined: 19 Nov 2007
Posts: 39
|
| Posted: Thu Nov 29, 2007 6:07 pm Post subject: |
|
|
Ok, raster looks fine on the tube...
Lens on the other hand......
I switched it with the red lens and the bad focus stayed with the lens. Easily noticeable even though I didn't much like the effect of a red-colourfiltered lens on the green tube
Looked in the lens and saw some smudges and fingerprints so cleaning it could be a first step though I doubt dirt would account for such a difference between the center of the image and the outside...
But if that's not it, I don't know what else I can do to solve this. Is there any other option besides switching out the lens?
I measured the vertical rasterline in the center and toward the edges with the bad lense btw:
Center -> 0.4"
Edge -> 1.4"
|
|
| Back to top |
|
|
DisTreSs
Joined: 19 Nov 2007
Posts: 39
|
| Posted: Fri Nov 30, 2007 12:22 pm Post subject: |
|
|
|
anybody???
|
|
| Back to top |
|
|
DisTreSs
Joined: 19 Nov 2007
Posts: 39
|
| Posted: Fri Nov 30, 2007 9:07 pm Post subject: |
|
|
Guessing it's the colourfilter since when I hold the lens up to the light it is noticably more smudged than any of the other filters.
I started taking the HD8 apart but only got as far as taking out the screws which hold the plastic rim in place...
Anybody know where to go from here?
Just need to be able to take out the filter...
|
|
| Back to top |
|
|
DisTreSs
Joined: 19 Nov 2007
Posts: 39
|
| Posted: Sat Dec 01, 2007 7:32 pm Post subject: |
|
|
Ok scratch all the above: it DOESN'T have anything to do with the lenses unfortunately.....
Turns out, now I know what to look for, that the problem IS visible on the tube. So I'm guessing this is somekind of EM problem.
Please tell me this is easy to fix and doesn't have to cost an arm and a leg.
Pleaaaaaaaase.... *sniff*
|
|
| Back to top |
|
|
zGman
Joined: 22 May 2006
Posts: 599
|
| Posted: Tue Dec 04, 2007 3:58 am Post subject: BG808S Focus |
|
|
Main menu>>Service>>Dynamic Astigmatism
G
|
|
| Back to top |
|
|
DisTreSs
Joined: 19 Nov 2007
Posts: 39
|
| Posted: Wed Dec 05, 2007 11:35 am Post subject: |
|
|
Hey zGman,
thx for the input, but someone was kind enough to lend me his focusboard and it cleared things right up!
I was originally told that the SEOS board that was in there had been restored to a default board but this was obviously not the case.
Me so happy now
|
|
| Back to top |
|
|
perisoft
Joined: 29 Aug 2007
Posts: 2920
Location: Ithaca, NY
|
| Posted: Wed Dec 05, 2007 2:18 pm Post subject: |
|
|
Awesome! 808s is a really nice machine. Drop me a PM if you want to trade notes... I just did a tube swap on mine and am learning a lot in a hurry, though I'm still no expert. 
_________________
|
|
| Back to top |
|
|
|
|
