maybe Tim will join us in this discussion, and I do agree with him that the Marquee prefers a higher voltage than 700mv on the BNC's. And maybe KBK and Chris will also chime in on the mods and tweaks. I only hope we stay away from discussion on power cords and bat wings and such
I have several tweaks and mods myself, but for the most part I would only want to discuss upgrades and certain fixes.
The goal with a properly tuned Marquee is to find the right signal level on the BNC's, that way you'll be able to keep the contrast at closer to mid point. because when you increase the contrast, you also bring up the noise floor. By increasing the contrast you bring up the noise that's in the projector. Claus mentioned this:
"you could amplify the video signal at the very start at the video chain, and then we could get a better S/N level through the projector and then lower the gain at the very end in the projector (eg. at the neck board)."
Ok, enough on that, now let's get back to the neck boards. here's a little test to check the boards for those who can't remove and inspect them.
Turn on the projector and let warm up for 30 minutes or so. After warm up, follow this procedure: Press the '#' key once and then...
Press 'UTIL' on the remote, press 1, and then press 6.
Select number '3' (47.71/60) and then scroll thru all three colors by pressing 'Color' and then 1 (red), 2 (green), 3 (blue). you should be seeing all three color grids being displayed on the screen, now move very close to the screen. If the projector has a reasonable setup, all three color grids should be tight in the middle of the screen with no flare or smear to the right of the grid.
Now, go back '#' (Util, 1, 6) and select 5 (89.30 / 70) that should put you in the high band, scroll thru (color - 1,2,3) all three color grids should display, now see if the grids smear to the right (in the center only).
Do the same as above, but select '6' (126.84 / 60) as the final test.
post back your results...