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Green focus on Barco 1209s

 
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alb_qwerti



Joined: 30 Sep 2008
Posts: 14



PostLink    Posted: Thu Apr 11, 2019 11:51 am    Post subject: Green focus on Barco 1209s Reply with quote


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Dear Members,

Mechanical adjusting the focus on my pj I noticed a strange thing.

With midpoint focus on 57 and contrast to 80 when I move everything I cannot obtain a good focus on green tube.
1- Center focus
2- Corner focus
3- Scheimpflug

Then I checked the 2pole/4pole rings and the defocused lines and dots are centered/round.

Now the strange thing:
The deflection block is fully against the CRT bulb (correct)
The focus unit is not 8-10mm apart from it (as shoud be and actually is on the R e B tubes) but is fully against the deflection block. To increase the center focus I shoud go even further.

Is there an electronic focus pot for the green tube that shoud be unadjusted on some board?

Thanks for any advice,
Alberto
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gjaky



Joined: 05 Jun 2010
Posts: 2626
Location: Budapest, Hungary


PostLink    Posted: Fri Apr 12, 2019 6:29 am    Post subject: Reply with quote

Does the electronic focus work at all on green?
Does the green tube has the exact same part number as the other two tubes?

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projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB
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alb_qwerti



Joined: 30 Sep 2008
Posts: 14



PostLink    Posted: Fri Apr 12, 2019 8:50 am    Post subject: Reply with quote

Hi, thanks for your answer.

The electonic focus is working, with that I can achieve perfect focus all round (with some settings at the end of the scale anyway).
But I would understand what's going wrong with the setup.

The 3 tubes are standard Barco.

Regards,
Alberto
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