Processor instability? - AVS Forum
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post #1 of 5 Old 08-13-2000, 02:04 PM - Thread Starter
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I've already posted something similar in the crt section but I'd like to get it in here also. I recently (about four weeks ago) purchased a 4403ultra scaler from runco.I have it running through double stacked 980 ultras. Since it was installed I've seen some instability in the convergence of the individual projectors (color fringing)and also between projectors(two seperate images). This instability didn't show up with the runco sc3050 line doubler.Also this lack of convergence occurs about three out of four times the system is turned on and doesn't change significantly during the viewing.Does anyone have thoughts on this?

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post #2 of 5 Old 08-13-2000, 08:53 PM
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A double stack is hard to maintain. You will always get some drifting until you get a couple of thousand hours on the tubes and it sould settle into its pattern. How many hours do you have on the projectors. Also what scan rate do you have the scaler set to.
Congrats on your double stack. It must look stunning when converged. What size screen are you running.


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post #3 of 5 Old 08-14-2000, 06:56 PM
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Scott
For every different scan rate you need to do another complete setup in your projector and put it into memory!

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post #4 of 5 Old 08-15-2000, 06:53 PM - Thread Starter
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Allen,Thanks for your time and response. This could be one of those stories which could only be appreciated over a drink but I didn't get to use the projectors much because they were with my ex wife! The projectors only have 375 hours on them. They really do look wonderful most of the time even before I had the scaler. This intermittant problem is the only blemish. I'm running them at 720p which I've been told is probably the optimum scan rate for this tube size(although I'd love to hear any other thoughts on this as well).I'm using a Stewart Videomatte 200(2.0 gain)107" wide at 16x9.Despite the fact that I've only used the projectors for a few hundred hours I'm familiar with the drifting which is gradual and progressive. This is intermittant and may look essentially perfect(or at least as perfect as as an anal retentive such as myself could hope for) and then be off later at different time, then on again when it's restarted at some later time.Also ,once it's on it doesn't get worse or better during that viewing .I've noticed the last few days if it is left off for a few hours when it's then turned on it's converged and stable!

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post #5 of 5 Old 08-24-2000, 02:15 PM - Thread Starter
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I guess I did't notice before but there does appear to be some instability during viewing. Since I rarely have the time to sit down to watch it for more than an hour or two at a time ,I hadn't noticed it before. The other day when the owner of the AV store which installed the system for me was over to see it in action ,we watched various materials for three and a half hours and we both noticed as an example stars in the background would have an eliptical shape instead of round .I'm sure if left running there would have been two seperate images. Ken Whitcomb did the calibration and has been contacted, but due to CEDIA has't had the opportunity to try to get any definitve thoughts from the Runco people.

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