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Since this is your first experience with a front projector, you really should try to find a user/install manual or seek advice from someone that knows this particular projector. If your intention is to learn how to fix them,seek some help from those who have the experience. This is not to say that there isn't anyone here that can help you, but since you are a novice, you can really cause some further damage or hurt yourself if you go at it willy nilly.I speak from experience..
The green gun gets most of the work in a 3 crt configuration.Maybe this is why it's weak. There are some G2 controls on projectors, but I'm not certain about the Zenith you have. Also, there usually is a switch that turns off each gun for sizing,geometry alignment,purity,etc. If not, then you would cap off each gun on the front and only allow the channel you want.
Some projectors have a switch that changes the image from a floor mounted position to a ceiling mount.Others have option pins that you change with jumpers.
Again I would suggest that you try posting on the AVS forum.Bunch of crt projector people who are very knowlegeable and someone may very well know your projector.
Good luck and let us know how things are progressing. Attach some pictures if you can.
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