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416ray4538
Joined: 14 Jul 2009
Posts: 517
Location: near Toronto Ont
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| Posted: Sun Nov 27, 2011 11:53 pm Post subject: G2 |
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Could someone please explain G2 adjustment or point to where it's explained?
Thanks
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When the first clock was invented, how did they know what time to set it to?
No point being pessimistic; it probably would't work anyway.
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Mon Nov 28, 2011 12:08 am Post subject: |
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Hello
G2 is a bias voltage applied in the electron gun, 400 to 900 vdc depending. On some models it is adjusted by knobs inside the chassis, on high-end machines it is adjusted by the keypad in a service menu. What projector do you have?
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416ray4538
Joined: 14 Jul 2009
Posts: 517
Location: near Toronto Ont
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| Posted: Mon Nov 28, 2011 12:15 am Post subject: |
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Ampro 4600.
I had some board problems and sent the boards to Curt. Since my setup is gone the way of the Dodo I have to start at the beginning. While chasing the problem G2 came up so I'm assuming that it is one of many thing I now have to look at.
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When the first clock was invented, how did they know what time to set it to?
No point being pessimistic; it probably would't work anyway.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Mon Nov 28, 2011 12:28 am Post subject: |
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I'm guessing you know where the G2 adjustment knobs are?
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416ray4538
Joined: 14 Jul 2009
Posts: 517
Location: near Toronto Ont
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| Posted: Mon Nov 28, 2011 12:32 am Post subject: |
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Little red fellas on the neck board?
_________________
When the first clock was invented, how did they know what time to set it to?
No point being pessimistic; it probably would't work anyway.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Mon Nov 28, 2011 12:40 am Post subject: |
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| 416ray4538 wrote: | | Little red fellas on the neck board? |
Yep.
What I usually do is turn off all 3 tubes with the remote. Then while looking into each color lens, turn up the G2 until you can see the raster. Then slowly turn it down until the raster just disappears. Do this for all 3 colors. G2 is then done. Turn the 3 tubes back on and with no signal being inputed,set the brightness at 50% and contrast down to maybe 20%. Then go into the sub brightness controls in the remote and again looking into each color lens adjust up the coresponding color until you see the raster, then adjust down until the raster just disappears. After all three colors are done, if you increase the master brightness, all 3 colors should come on at the same time and lowering it all 3 should disappear at the same time. The G2 and sub brightness is now done.
Another method has been suggested in the past. I like this one that i have always used.
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416ray4538
Joined: 14 Jul 2009
Posts: 517
Location: near Toronto Ont
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| Posted: Mon Nov 28, 2011 12:44 am Post subject: |
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Cool.
As soon as I get the boards back in I'll get to this.
My battery died so I get to start from zip.
Thanks
_________________
When the first clock was invented, how did they know what time to set it to?
No point being pessimistic; it probably would't work anyway.
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Tue Nov 29, 2011 5:37 am Post subject: |
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Macgyver, what is the method for doing this on an NEC PG? Mine has been played with before i bought it.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Tue Nov 29, 2011 2:30 pm Post subject: |
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| CasetheCorvetteman wrote: | | Macgyver, what is the method for doing this on an NEC PG? Mine has been played with before i bought it. |
Shoot me an email. I dont want to post online because your not suppose to adjust the G2 in a PG. But if it's been messed with I believe I had found the best method to get it back to where it should be.
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Tue Nov 29, 2011 3:46 pm Post subject: |
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No worries mate, will do now 
Cheers
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