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Post by tschaeikaei on Dec 6, 2015 13:56:26 GMT -5
Ah. i always hated those guys who are new to a forum, ask something and never show up again. Seems i've become one of them. Let me explain something: I'm still interested in this. But I've seen another problem that is currently more important to me. We'll figure this out, Gabor, i'm glad you wrote about it over on Curts forum. So thank you all for your answers, i'll come back to it. One of my FGMs does misbehave in terms of geometry and vertical convergence. I does not do horizontal convergence, pincushion and keystone. Each on all three colors. Everything else works with the other FGM. Both (the working and problematic) are 03-270354-02P, both with the strange black box on it. I don't have a schematic for that board number,the only schematic i can find is 03-260354-02P. Does anyone have the right schematic or can tell me the differences? I stared at the 03-26... schematic for a long time and tried to interpret it. Measured some resistors (all ok) that seemed fusibles to me. And since that board consists of three amps (or six), each for every color /direction, i taught something common for all of them is broken. But i cannot find it. If someone could explain the shortcuts in the schematics and where i should look.. As far as i understand this, the signal goes from the CLM to the FGM and then to the convergence amp which is connected to the convergence coils. I cannot imagine how the FGM does affect convergence, but it does. Regards, Julian www.xymox1.com/Projector/Ultras/Focus/00-260354-02P.pdf
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Post by tschaeikaei on Dec 2, 2015 6:08:51 GMT -5
Hey Guys, like the title says: i converted an 8500Ultra (2001 build) into a 9" machine using a PT22-19 green and P19LPB-03 blue and red tubes. The projector is running nicely, but since i want to blend it with a 9500Ultra (which has 9" VNBs) i think i have to adjust master brightness so all 6 tubes will cut off at the same point. I know that i'll have to set master brightness with R86 (the sealed pot on the VNBs) but i don't know which values they should be set to and where to measure. Cathode current should be something between 1 and 1,4mA and measuring directly at the cathode is what i think i will have to. I could simply desolder a R86 from a 9" VNB, measure resistance, desolder the pots from the 8" VNBs and set them to the same value but i think that's not the best idea. Could work, but there are surely some variations in the circuit as well as variations in the behavior of the power supplies that add up to variations in anode- cathode current. Since this setting is very critical (speaking about X-Rays and tube health) i think i need definite instructions. So this is about master brightness, don't get it wrong. I'm not talking about G2 or something else here.
Please, if you have advise for me, tell me.
Regards, Julian
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