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LOTREE
Joined: 19 Mar 2006
Posts: 401
Location: Paradise, Newfoundland
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| Posted: Mon Mar 08, 2010 8:12 pm Post subject: Barco 808 / Zenith 1200x G2 adjustment |
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I've mastered my ECP 4500, grey scale by sight alone, and I must say the image was superb . While I miss the sharp corner/side focus I've moved up to a 1200x and for the life of me I can't figure out how to adjust the G2's per the manual and on screen guide instructions:
A green LED is mounted on each of the CRT sockets
When selecting the G2 adjustment menu, these green LEDs must be out. If not, follow the procedure below to adjust the G2:
- Adjust the G2 potentiometers very slowly with a plastic tweaker until the LED of the corresponding amplifier just stops illuminating. Repeate the adjustment for the other colors.
Well... I was able to ajust the G2 pots no problem, slowly turned down with the plastic 'tweaker' from my 4500 then slowly turned up but hesitant to turn up too high so I just stopped. I did adjust all 3, Red, Green, Blue until I was able to get a decent grey scale pattern from an image I had saved. That said, is there more in the menu of the projector I need to access? Do I have to crank the pots up to get the lights to shut off?
I know my grey scale now can still use some improvement but it's adjusted from the projector not the output on the video card which I set back to defaults. Unlike the ECP 4500 my green tube illuminates first when turning up the brightness with contrast near zero. I practically have to max out the brightness to see anything on the blue. Shouldn't I be able to see the raster light up on each tube face at the same time? I haven't really touched the Gain controls either as of yet.
Any help, any ideas? How should I tackle the grey scale setup without the use of a calibrator for now?
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Zenith Pro 1200x | Electrohome ECP 4500 | Yamaha HTR-5740 | HTPC & Speaker build to follow
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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| Posted: Mon Mar 08, 2010 10:39 pm Post subject: |
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In the custom color setting menu you can adjust the Red and Blue CRT output up or down relative to Green.
Not sure what you are asking though I guess ...
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LOTREE
Joined: 19 Mar 2006
Posts: 401
Location: Paradise, Newfoundland
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| Posted: Tue Mar 09, 2010 4:10 am Post subject: |
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I'd like to know what the manual is talking about from what I have bold in my first post. At what point do I turn the pot that the green light goes out or do I have to follow that step at all? I can access the G2 software menu but I cannot get any further than the main screen until this is done I assume.
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Zenith Pro 1200x | Electrohome ECP 4500 | Yamaha HTR-5740 | HTPC & Speaker build to follow
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Tue Mar 09, 2010 8:36 am Post subject: |
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As far I can tell it doesn't matter when you turn G2 pots, you don't have to be in service menu to make adjustment. Just make sure you do adjustment to well warmed up projector. (30 minutes or so)
You can use black picture for adjustment, to see that you are at about right area. There is also chance that those leds wont never go off. Amps have adjustment pots for leds and these could be drifted. Resetting these you need scope.
That's why I ignore leds and use old black picture method for adjustment, it's more accurate than trusting to led system that have been calibrated 10-15 years ago.  ABL system is active and working even those leds are on.
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perisoft
Joined: 29 Aug 2007
Posts: 2920
Location: Ithaca, NY
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| Posted: Thu Mar 11, 2010 2:53 am Post subject: |
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| Ile wrote: |
That's why I ignore leds and use old black picture method for adjustment, it's more accurate than trusting to led system that have been calibrated 10-15 years ago. ABL system is active and working even those leds are on. |
+1. I adjusted my 808s that way - dark room and turn up G2 until I could barely see the raster and then back down a bit. All the real calibration is done in software on my HTPC. If you don't have any way to do parametric gamma you might need to be more careful, though.
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Thu Mar 11, 2010 9:32 am Post subject: Re: Barco 808 / Zenith 1200x G2 adjustment |
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| LOTREE wrote: | | How should I tackle the grey scale setup without the use of a calibrator for now? |
-set 6500K color setting from menu and set brightness to 50
-check/adjust G2
-defocus blue about +10-15 cliks
-Adjust R/B gains from custom color balance menu using IRE80 test picture. Without colorimeter it's good to check that cyan and yellow color balance is about correct selecting color select B/G and R/G with IRE80 test picture.
-Adjust R/B cut off from custom color balance menu using IRE20 test picture.
-check R/B gains again, because adjusting cut off affect also to gains.
I leaved projector gamma adjustments to factory defaults. In my 808s it was only needed to add 1.1 gamma curve to video card drivers to get measured 2.2 gamma from screen.
Here is Curts procedure
http://www.curtpalme.com/ES_Tube_Projector_Gray_Scale_Adjustment1.shtm
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AVphile
Joined: 02 Dec 2008
Posts: 334
Location: Ottawa, Ontario
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| Posted: Sat Oct 01, 2011 5:58 am Post subject: |
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This procedure is OK for EM tube 808s? I have the G808s with Sony tubes and LEDs are useless.
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AVStefan
Old setup: HDFury3 -> BG-808s -> HD-145
New setup: JVC D-ILA -> Stewart StudioTek 130 G4
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Gerbrand
Joined: 13 May 2008
Posts: 199
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| Posted: Sat Oct 01, 2011 7:52 am Post subject: |
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I always thought that you needed to go into the G2 menu, because then the ABL circuit is turned off, so that you can actually affect the brightness by turning the pots. So I normally go into the G2 menu, but ignore the LEDS when adjusting G2.
Gerbrand
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Sat Oct 01, 2011 10:23 am Post subject: |
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| Gerbrand wrote: | | I always thought that you needed to go into the G2 menu, because then the ABL circuit is turned off, |
I don't think that will turn ABL off and adjustment seems same without using menu.
I guess that you have to remove lot off components to turn ABL off completely, least that is case in 801s/808 75MHz neck boards that have pretty similar circuitry.
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Gerbrand
Joined: 13 May 2008
Posts: 199
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| Posted: Sat Oct 01, 2011 11:50 am Post subject: |
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So what does the G2 menu do then? Just set the scan rate at which the LEDs were adjusted at the factory and display instruction on screen?
Gerbrand
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Sat Oct 01, 2011 3:38 pm Post subject: |
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| Gerbrand wrote: | So what does the G2 menu do then? Just set the scan rate at which the LEDs were adjusted at the factory and display instruction on screen?
Gerbrand |
Pretty much that, maybe it's also thought that menu can be used when source is not connected.
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AVphile
Joined: 02 Dec 2008
Posts: 334
Location: Ottawa, Ontario
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| Posted: Mon Oct 03, 2011 4:38 am Post subject: |
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It also temporarily ignores the user control settings that would affect the brightness.
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AVStefan
Old setup: HDFury3 -> BG-808s -> HD-145
New setup: JVC D-ILA -> Stewart StudioTek 130 G4
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WTS
Joined: 08 Mar 2006
Posts: 1276
Location: Calgary
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| Posted: Tue Oct 11, 2011 1:21 pm Post subject: |
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You need to follow the instructions, go to the G2 screen and adjust each trim pot so that each tubes LED just turns off. I ususally did this after the projector warmed up for 30 mins. These are not 808's so don't adjust them like they are. The G2 adjustment has nothing to do with the grayscale.
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Walter
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AVphile
Joined: 02 Dec 2008
Posts: 334
Location: Ottawa, Ontario
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| Posted: Wed Oct 12, 2011 1:24 am Post subject: |
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| WTS wrote: | | These are not 808's so don't adjust them like they are. |
Who are you addressing? The 1200x guy?
| WTS wrote: | | The G2 adjustment has nothing to do with the grayscale. |
It does in the way that brightness and gamma affect greyscale.
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WTS
Joined: 08 Mar 2006
Posts: 1276
Location: Calgary
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| Posted: Wed Oct 12, 2011 12:57 pm Post subject: |
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Yes I was addressing the 1200 guy as this thread is about the 1200, yes the 808 has some similarities but it's not the same in every way. Do you adjust the G2s in the 808 the same way using the G2 screen in the menu?
I was referring to the G2 adjustment in the Zenith1200, in other words you don't use the G2 adjustments for setting the grayscale or anything else except the G2s.
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Walter
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LOTREE
Joined: 19 Mar 2006
Posts: 401
Location: Paradise, Newfoundland
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| Posted: Wed Oct 12, 2011 6:03 pm Post subject: |
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As for me, the projector has been humming along fine since I first started this thread. Basically I ignored the LED's and adjusted each G2 until the raster was barely lit. Anything done beyond that was done through hours of manual adjustment in the G2 and Gain software controls. I always felt the setup guide for G2 was incomplete as it tells you to start the process of adjustment and leaves you hanging about what to do next.
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