electrohome color problem

[chris79]

I own an orginal galaga cocktail with the orginal monitor.  The picture looks great except on the edges.  The colors are wrong on the edges and the colors have some convergence problems but only on the edges as the rest of the colors in the center look great.  I tried degaussing the monitor with an external degaussing coil but that did not do anything.  The monitor has been recapped from what I am told.  Anyone have any ideas or suggestions to what this problem could be i'm hoping it's not something that can't be fixed like a warped shadow mask.

[Ken Layton]

Color alignment at the edges of the tube are always controlled by the yoke and how it's tilted by the rubber wedges jammed under it.

[chris79]

Would that mean the yoke is bad or that it is out of alignment

thank you for replying

[tta583]

Alignment. 

Most monitor manuals give a set of procedures for setting up the yoke.  Keep in mind it is as much art as science.  I have never done one from start to finish (bare tube on which I assemble a yoke and rings) but have "adjusted" several like yours.  Almost there but not right.  Needless to say I have never gotten it perfect.  I am not sure perfect is attainable.  It drives me crazy but I end up having to settle for close.

Actually on close inspection of monitors I think look great I see just as much if not more conversion issues so just try and not worry about it once I get a good overall picture.

Anyway, you will need some kind of color and cross hatch generator.  I don't know what kind of patterns, if any at all, a galaga can generate.  In my case I plug up a JAMMA harness and run a Simpsons or TMNT so that I can flip on some test patterns.

[FrizzleFried]

After some 2 hours messing around with my monitor (I did replace the yoke,  pulled the convergence rings from another tube, etc)...I too settled for "good enough".   The top right corner of my monitor has it's blue slightly out of wack,  but as soon as I adjust that the rest of the monitor has some issue...I tried and tried and tried again to no avail so I just accepted it for what it is.  Hell,  I even called a few local TV shops to see if they adjust convergence and they all gave me the "HUH" answer...it seems most TV shops just replace crap now instead of repair them.

I had one arcade distribution company here offer to adjust it for me....for $125!!!  Yah...right.

[chris79]

ok i'm not obsessed with perfection just enough to were the color are correct and it's good enough I thank all of you for your posts you all have been very helpful