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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Fri Jun 04, 2010 10:04 am Post subject: |
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| till wrote: | | Ile wrote: |
Check also 2-pole magnets adjustment. Good test for checking this: Adjust tube focus back and fort and see if raster moves, if it don't move it's right on. If 2-pole is off it could cause raster to drift due tube heating.
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Do you mean optical or electronical focus? |
Electronic focus.
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till
Joined: 25 Jan 2010
Posts: 31
Location: Germany
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| Posted: Tue Jun 22, 2010 7:11 pm Post subject: |
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I did check that and astig was wrong, after little tuning it now is almost stable, sharpness improved and the issue with bright scenes as well  I'll do another magnet-session to fine-tune it, but it's way better now, thank you Ile
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Fri Jun 25, 2010 9:43 am Post subject: Re: Newbie - Barco Data 800 Modifications |
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| ben12345 wrote: | Hi All,
I've had my BD 800 now for about 6 years, being used as my main 'TV'. I've put about 3000 - 4000 hours on it, witn no real problems other than a duff SMPS board, which I swapped out with my spare projector.
Now i'm moving up to higher definition source material, i've noticed that the image is a little soft, almost as if the focus is out. I've heard that this is a problem on some of the older Barcos running higher resolutions.
Is there any modifications that can help sharpen the image up a bit? I've heard that the Barco 801 RGB amps, switcher and driver can be swapped in to gain 75MHz bandwidth.
Would recapping certain boards help?
Cheers,
Ben |
You cannot use the 75mhz RGB output amps in the 800 they will physically fit but the 800 SMPS supplies 230v to the RGB output amps in the 800 and the 75mhz output amps from any 801 or 808 require 210v. You will destroy the amps if you use them. You cannot put a SMPS from an 801 in the 800 either. Your 800 is stuck with the 50mhz amps.
The switcher board can be changed but this probably will not have any effect on focus.
You could find a better focus G2 board.
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virusc
Joined: 11 Apr 2007
Posts: 358
Location: Massachusetts
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| Posted: Fri Jun 25, 2010 10:53 am Post subject: |
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Ben, you said you have put 3-4k hours on the unit. ES tubes start to soften around then and I'm sure you did not get the projector with 0 hours so I do not think anything will sharpen without replacing tubes. the 801 focus module will not give you better focus in this case as it just has a little more range needed for MSP tubes. 800 comes stock with MP tubes. I would recommend finding a 2nd projector to play around with as if you start modding/upgrading/replacing caps their is a good chance something will go wrong and then you have no projector.
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Fri Jun 25, 2010 11:24 am Post subject: |
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| virusc wrote: | | Ben, you said you have put 3-4k hours on the unit. ES tubes start to soften around then and I'm sure you did not get the projector with 0 hours so I do not think anything will sharpen without replacing tubes. the 801 focus module will not give you better focus in this case as it just has a little more range needed for MSP tubes. 800 comes stock with MP tubes. I would recommend finding a 2nd projector to play around with as if you start modding/upgrading/replacing caps their is a good chance something will go wrong and then you have no projector. |
ES tubes certainly do soften over time but I have had success in improving focus by replacing the focus board as they also lose their ability over time. So a focus board with less hours on it will probably help and its way cheaper than replacing tubes and if you were to put replacement tubes in the set I would certainly suggest a replacement focus board.
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virusc
Joined: 11 Apr 2007
Posts: 358
Location: Massachusetts
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| Posted: Fri Jun 25, 2010 12:52 pm Post subject: |
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KM I agree with some of what you are saying but in this case I do not think that is what he should be considering first. Are you speaking of MP tubes like in the 800 or 146a tubes in your 1101? I have retubed and setup at least 100 800 series projectors for commercial and simulator use and have not found this to be true of MP tubes. Nothing after 5-6k hours would tighten beam focus. I bet the newer focus module will cost $100 as they do not go cheap and people hold on to them. That $100 or whatever could be used to buy another projector(possibly a 801) which may be for parts or a working upgrade to what he has. It just does not make since to dump money into this thinking that focus/resolution/performance will improve without getting better/new tubes.
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Sun Jun 27, 2010 3:10 am Post subject: |
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| virusc wrote: | | KM I agree with some of what you are saying but in this case I do not think that is what he should be considering first. Are you speaking of MP tubes like in the 800 or 146a tubes in your 1101? I have retubed and setup at least 100 800 series projectors for commercial and simulator use and have not found this to be true of MP tubes. Nothing after 5-6k hours would tighten beam focus. I bet the newer focus module will cost $100 as they do not go cheap and people hold on to them. That $100 or whatever could be used to buy another projector(possibly a 801) which may be for parts or a working upgrade to what he has. It just does not make since to dump money into this thinking that focus/resolution/performance will improve without getting better/new tubes. |
I am refereing to SD146a tubes. I have found that some focus boards don't do the job very well. Recently I changed a focus board to find that a blue tube I thought was terrible because it just would not focus was actually ok because with the replacement focus board it was as good as the other tubes. Focus boards can be cheap too I have picked them for as little a USD$10 but would not pay more than $40 plus postage but you can't be in a hurry though you have to wait for the right seller to come along. Whether its worth it or not is hard to say I guess thats something for the PJ owner to decide but you can get a good image with time and the right parts.
He is stuck with the 50mhz RGB amps with the 800 any they do produce quite a bit of video noise so I would agree he would be far better off with an 801 if he wants to stay with ES focus.
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