Re: adjusting colors in Centipede monitor

You could try this. Worked on my Centipede curiously enough :)

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Subject: Re: WG4906 monitor question - adjusting colors and cutoffs
Date: 15 Feb 2001 17:44:11 GMT
From: hvaleagues@aol.com (Hudson Valley Amusement)
Newsgroups: rec.games.video.arcade.collecting

I have been using a very simple method for many years now and have
been very pleased with the results.

1) Remove all video and sync connections to the chassis.

2) Center your two drive pots and turn your 3 cut-offs to their
minimums (Fully counterclockwise).

3) Apply power to the monitor and adjust your brightness until
you can just see the raster on the screen. Works best with the
lights off in the room.

4) At this point your raster will probably have a dominant color
tint to it. Either red, blue or green. Whatever color is dominant
leave its controls alone and adjust the other two colors cut-offs
until you have equal amounts of all three colors. When all three
are equal you should have a white or grayish/white raster.

5) Reconnect your video and sync hookups and your picture should
be very close to as good as it will get. If you make any adjustments
from here, they will be very small.

This method assumes that the tube and all color circuitry is working.

Mark
www.hudsonvalleyamusement.com

------------------------

Rod Spade wrote:

> I recapped the WG 19K4903 in my Centipede, and somehow managed to screw
> up all the colors. I'd prefer to avoid the full White Balance procedure
> in the manual, because it involves jumpers and an oscilloscope and
> fiddling with the Screen and Black Level controls and stuff. That's a
> little out of my league. I just want to tweak the pots on the yoke
> board to get decent colors.
>
> I assume the easiest way to do this is with a white test screen. The
> Centipede self-test mode lets you cycle through 16 background colors,
> but the manual doesn't say what they are! I can't tell if one of those
> colors is supposed to be white. Does anyone have a list of the
> Centipede self-test background color sequence?
>
> The pots on the yoke board are Red and Green Drive and Red/Green/Blue
> Cutoff. What's the difference between "Drive" and "Cutoff"? Can I just
> put some of those at max values and tweak the remainder, or must they
> all be adjusted through some iterative procedure? I know enough about
> the color spectrum to figure out what primary I need more or less of,
> but I don't know enough about how monitors work to figure out why you
> need five pots for it....
>
> Thanks for your help!
>
> Rod
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Received on Tue Nov 26 11:56:50 2002