CurtPalme.com Home Theater Forum

cdsnyder · Joined: 08 Jan 2018 Posts: 7 Location: wisconsin, usa

Hi all. Been using this marquee 8000 for around 6 years. Haven't registered until now because I always found enough info through your site to solve my own problems up until now. Thanks for the great site!

I recently took my projector down off the ceiling to replace a tube. Everything went fine, but I'd like to solve another problem that I've just tolerated up until now.

Attached is a test pattern. All projector settings are nulled, no blanking. I only set the flare/astig/focus on the green tube. The distance between vertical lines starts wide on the left and gradually gets closer together on the right. The right side horizontal scan also seems to stop short of the full image width, and there is a bright bar on the last "pixel" column (doesn't show up well in pictures). In the past I've just set the blanking to 1 and it gets hidden. This is true of all 3 colors.

I usually have to either shift the image on the raster or shift the screen. If I put the test grid center point on the screen center point, then the left side hangs over the border and the right side comes up short. The screen is aligned pretty close to perfect (and besides, the linearity problem can be seen on the tube face).

Is this fixable? Or just something to put up with for owning a mid-tier CRT?

gjaky · Joined: 05 Jun 2010 Posts: 2790 Location: Budapest, Hungary

I'm quite sure the bright line on the edge is normal for a 8000.
As for the linearity, while everything at midpoint see if unplugging the corresponding convergence yoke makes any difference? If not, then it's the HDM.

barclay66 · Posted: Mon Jan 08, 2018 8:25 pm Post subject:

Hi,

What about using the horizontal linearity controls in the geometry menu?
Or is it that the 8000 doesn‘t have them?
In this case, a chassis upgrade to a 9500 would be a big plus...

Regards,
barclay66

gjaky · Joined: 05 Jun 2010 Posts: 2790 Location: Budapest, Hungary

cdsnyder · Joined: 08 Jan 2018 Posts: 7 Location: wisconsin, usa

gjaky · Joined: 05 Jun 2010 Posts: 2790 Location: Budapest, Hungary

Well, you can also put the 8" tubes right into your 9500 chassis with the mounting plates from the 8000 until (if ever) you replace the 9" tubes, this is something like a 1 hour work (not including projector mounting issues)

cdsnyder · Joined: 08 Jan 2018 Posts: 7 Location: wisconsin, usa

Wow I didn't know I could do that. I've had this 9500 chassis sitting in a closet for 3 years with the 8000 on the ceiling. I might be getting 9" tubes, but it's good to know I can make an improvement either way. Thanks.