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Kujako

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OK... so I am trying once again to get my QNIC CGM-2500 setup/tuned. Main issue it's had is that the color mix is still a bit too red (which may be not enough blue). However, I've found that this is at least slightly mitigated by letting it warm up for a half hour or so. This means that one of my issues is that I've been adjusting the color before it's been warmed up so everything is is a bit off. However, I am now also seeing that on SOME arcade boards (Namco 2x6 for example) there is a lot of color bleed off of white, indicating that the cutoffs are wrong. But I don't see this, or at least not as much, on other boards including my JAMMA test board (riddledtv, older one without sound). When I show the white test grid, I can only detect the slightest color bleed, small enough that it would be really hard to tweak giving the inaccuracy of the potentiometers.

So... thinking I want to start fresh. But I've not found a good guide to setting up one of these. Meaning I want to adjust everything down to their lowest setting, RGB, cutoffs, contrast, brightness and follow a series of steps to tune in each pot one at a time. I have access to a fair selection of different arcade boards I could use, in addition to the aforementioned dedicated test board.

It is of course possible that the tube is just old and dying... I may pickup a LCD to swap in so that I could at least work on the CRT on a bench rather than in the cab. It was recapped a few years ago, or at least that's what the previous owner said. It's just never been correctly setup.

Any suggestions?
 

Kujako

Professional
Joined
Jun 3, 2020
Messages
453
Reaction score
200
Location
USA, California
Broke down, ordered a CGA LCD and a new pair of rubber gloves (mine had expired). Will get the CRT out and onto a workbench. May do a re-recap and see if that helps.
 
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