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jarseneau
Joined: 06 Nov 2007
Posts: 323
Location: WI
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| Posted: Sat Feb 20, 2010 11:12 pm Post subject: Is there a G2 adjustment on the SONY G90 |
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After many years of NEC XG ownership, I'm the proud new owner of a Sony G90. I just ordered a p19LUG Green CRT from Greg Eismann and expect to do some calibration when I install it. So far I haven't seen a G2 adjustment in the menus. I know there are BIAS and GAIN.
Is there a G2 adjustment and a guide for setup?
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Jerry
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winduptoy
Joined: 25 Nov 2006
Posts: 187
Location: Lunenburg, Nova Scotia
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| Posted: Sun Feb 21, 2010 1:30 pm Post subject: |
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If it's like the G70, you can access it by pressing the bias button twice. (once to open the bias menu, and again to toggle to G2) Press again to toggle back to bias.
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jarseneau
Joined: 06 Nov 2007
Posts: 323
Location: WI
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| Posted: Sun Feb 21, 2010 2:57 pm Post subject: |
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Thanks Winduptoy, I'll give that a try when the new tube arrives. Are there setup instructions? I downloaded the service manual but didn't find any. I did see a G1 section.
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Jerry
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_in_peace_
Joined: 21 Jul 2009
Posts: 152
Location: Sweden
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| Posted: Sun Feb 21, 2010 4:30 pm Post subject: |
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What is G2 doing? I can't get to it on my G70
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Zebu Fellenz
Joined: 21 Dec 2006
Posts: 2567
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| Posted: Sun Feb 21, 2010 5:03 pm Post subject: |
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| _in_peace_ wrote: | | What is G2 doing? I can't get to it on my G70 |
G2 is not an available option on G70's with newer firmware.
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overclkr
Joined: 08 Mar 2006
Posts: 4227
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| Posted: Sun Feb 21, 2010 7:17 pm Post subject: Re: Is there a G2 adjustment on the SONY G90 |
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| jarseneau wrote: | After many years of NEC XG ownership, I'm the proud new owner of a Sony G90. I just ordered a p19LUG Green CRT from Greg Eismann and expect to do some calibration when I install it. So far I haven't seen a G2 adjustment in the menus. I know there are BIAS and GAIN.
Is there a G2 adjustment and a guide for setup? |
The G2 on the G90 is Automatic. You have to turn on ABG mode for it to kick in and adjust auto.
No manual G2 on the G90.
Cliff
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jarseneau
Joined: 06 Nov 2007
Posts: 323
Location: WI
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| Posted: Sun Feb 21, 2010 7:29 pm Post subject: |
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| _in_peace_ wrote: | | What is G2 doing? I can't get to it on my G70 |
G2 sets up the point (of brightness) where the CRT just begins to light up. On the 12XX series pj's there was a test point to monitor as you adjusted the screen pot. The alternative method is to view the CRT face showing a gray scale and increasing G2 until the proper gray level just begins to light.
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Jerry
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jarseneau
Joined: 06 Nov 2007
Posts: 323
Location: WI
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| Posted: Sun Feb 21, 2010 9:57 pm Post subject: Re: Is there a G2 adjustment on the SONY G90 |
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| overclkr wrote: | The G2 on the G90 is Automatic. You have to turn on ABG mode for it to kick in and adjust auto.
No manual G2 on the G90.
Cliff |
Thanks Cliff. With 2 (or is it 3?) you ought to know  .
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Jerry
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betel
Joined: 20 Apr 2006
Posts: 448
Location: Maryville, Tennessee (Just South of Knoxville)
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| Posted: Mon Feb 22, 2010 2:18 am Post subject: |
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After turning on ABG, initially you will see a white line just above the image. It will disappear after about 20 minutes.
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CIR Engineering
Joined: 25 Aug 2008
Posts: 4269
Location: Chicago USA & Berlin Germany
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| Posted: Mon Feb 22, 2010 4:19 pm Post subject: |
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After running ABG for the required twenty minutes to establish the G2 setting I recommend turning off ABG and leaving it off. Any time you redo gray scale, just toggle ABG back on for twenty minutes before recalibration.
The only other way to change G2 on the G90 is to remove the Dallas chip, copy the data to a pc, edit the G2 addresses manually with a hex editor, and then rewrite and reinstall the Dallas chip. This is a dangerous procedure if you are not careful and the YA board (where the Dallas ship is installed) is delicate and rather irreplaceable.
craigr
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