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johnyfazer
Joined: 14 Jan 2014
Posts: 64
Location: Poland
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| Posted: Wed Nov 08, 2017 2:00 am Post subject: g2 barco retrographics 808s |
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Hi. I want to set the grayscale scale in my barco 808 retrographics. I want to make a colorimeter. I need to set G2. Execute command "g2 control", turn the potentiometers. Red LED goes out / ok /. The green LED goes out / ok /. I do not want to turn off the light on the blue lamp / wrong  . Any ideas? Sorry for my english - Google Translator
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Wed Nov 08, 2017 7:33 am Post subject: |
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Those pots, even though their values may have changed, are a good indicator of correct G2. So why don't you want to adjust Blue G2?
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Hulio
Joined: 15 Apr 2006
Posts: 494
Location: Belgium
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| Posted: Wed Nov 08, 2017 10:49 am Post subject: |
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Maybe I'm wrong, but I guess he is telling that the G2 led of the blue tube won't go off when adjusting ??
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johnyfazer
Joined: 14 Jan 2014
Posts: 64
Location: Poland
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| Posted: Wed Nov 08, 2017 11:25 am Post subject: |
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That's what I want to understand. Does the blue also have to go out? In the Instruction we write about the three lights on the lamps
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Hulio
Joined: 15 Apr 2006
Posts: 494
Location: Belgium
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| Posted: Wed Nov 08, 2017 11:57 am Post subject: |
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Yes, the leds must go off on all three colours when in G2 adjustments menu. I hope you adjust the right pots on the G2/diagnostic board (behind the focus block), and not the pots on the neck cards.
Here you find them.
http://www.curtpalme.com/Barco808_Layout7.shtm
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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: Wed Nov 08, 2017 3:07 pm Post subject: |
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If the LED on the blue tube does not go out, you may have a bad CRT socket/video amp, or a bad blue tube. When that used to happen and the rest of the set worked fine, I'd simply set the gain of the blue tube by eye. Was very common in a planetarium installation I used to take care of, with high hours on the tubes.
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